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Room temperature ferromagnetism in graphene/SiC(0001) system intercalated by Fe and Co / S. O. Filnov, D. A. Estyunin, I. I. Klimovskikh [et al.] // Phys. Status Solidi - Rapid Res. Lett. - 2024. - Vol. 18, Is. 3. - Ст. 2300336, DOI 10.1002/pssr.202300336. - Cited References: 76. - This research was funded by the Ministry of Science and Higher Education of the Russian Federation grant no. 075-15-2020-797 (13.1902.21.0024) . - ISSN 1862-6254. - ISSN 1862-6270
Аннотация: The utilization of graphene on silicon carbide (SiC) substrates holds substantial promise for advancements in spintronics and nanoelectronics. Furthermore, incorporating magnetic metals provides an optimal framework for probing fundamental physical phenomena. The approach to developing such systems is in situ intercalation of graphene with magnetic metals. Herein, the electronic structure is analyzed and the magnetic properties of the system are synthesized by the thermal decomposition of 6H-SiC(0001) surface and subsequent intercalation of graphene with cobalt (Co) and iron (Fe) atoms. X-ray photoemission spectroscopy and low-energy electron diffraction are employed to control the synthesis and metal intercalation processes. The morphological characteristics of the synthesized system are studied by means of atomic force microscopy. The findings derived from magneto-optic Kerr effect measurements reveal a homogeneous ferromagnetic ordering at room temperature. Angle-resolved photoemission spectroscopy is used to ascertain the impact of intercalation on graphene's electronic structure. The results of this study are essential for the development of graphene-based spintronics and nanoelectronic devices as well as for fundamental studies in magnetic graphene systems.

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Держатели документа:
Saint Petersburg State University, Saint Petersburg, 198504, Russian Federation
Donostia International Physics Center, Donostia-San Sebastian, 20018, Spain
Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Synchrotron Radiation Facility SKIF, Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Kol'tsovo, 630559, Russian Federation
National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation

Доп.точки доступа:
Filnov, S. O.; Estyunin, D. A.; Klimovskikh, I. I.; Estyunina, T. P.; Golyashov, V. A.; Tarasov, A. S.; Тарасов, Антон Сергеевич; Kosyrev, N. N.; Косырев, Николай Николаевич; Komarov, V. A.; Комаров, Василий Андреевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Rybkina, A. A.; Vilkov, O. Yu.; Shikin, A. M.; Tereshchenko, O. E.; Chumakov, R. G.; Lebedev, A. M.; Rybkin, A. G.
}
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Zhandun, V. S.
The arising of ferromagnetism in Al-doped Mn2(Ga1−xAlx)C MAX phases / V. S. Zhandun, N. G. Zamkova, O. N. Draganyuk // J. Magn. Magn. Mater. - 2024. - Vol. 601. - Ст. 172193, DOI 10.1016/j.jmmm.2024.172193. - Cited References: 30. - The study was funded by a grant from the Russian Science Foundation # 23-22-10020 https://rscf.ru/project/23-22-10020/, Krasnoyarsk Regional Fund of Science. The calculations were performed with the computer resources of "Complex modeling and data processing research installations of mega-class" SRC "Kurchatovsky Institute" (http://ckp.urcki.ru). The ternary phase diagrams for the calculation of formation enthalpies were taken from Materials Project (https://materialsproject.org) and OQMD (https://oqmd.org/) databases . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
MAX phases -- First-principle calculations -- Doping -- Magnetic properties -- Ferromagnetism -- Exchange constants
Аннотация: The magnetic properties of ordered MAX phases Mn2(AlxGa1−x)C (x = 0.125, 0.25, 0.5, 0.75 and 0.875) have been studied within the DFT-GGA. We have found that increase of Al atom at A-site leads to the formation of the ferromagnetic phase with large magnetization of about 3.6 μB/f.u. The investigation of the phase stability is performed by comparing the total energy of the MAX phases with that of a set of competitive phases for calculation of the phase formation enthalpy. Up to a concentration of Al atoms x = 0.7 the compound remains thermodynamically stable. The exchange constants analysis shows the crucial role of exchange interactions between manganese atoms along the c-axis in forming of ferromagnetism. The magnetic transition temperature of Mn2(AlxGa1−x)C alloys increases with increase of the aluminum concentration.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Professor L.F. Voino-Yasenetsky Krasnoyarsk State Medical University, Krasnoyarsk, 660022 Russia

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Draganyuk, O. N.; Драганюк, Оксана Николаевна; Жандун, Вячеслав Сергеевич
}
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Features of spin crossovers in magnetic materials / Yu. S. Orlov, S. V. Nikolaev, V. A. Dudnikov [et al.] // Phys. Usp. - 2023. - Vol. 66, Is. 7. - P. 647-672, DOI 10.3367/UFNe.2022.05.039195. - Cited References: 237. - The authors thank the Russian Science Foundation for financial support in the framework of project no. 18-12-00022 . - ISSN 1063-7869. - ISSN 1468-4780
Кл.слова (ненормированные):
spin crossovers -- exchange interaction -- Bose condensationl -- spin excitons -- transition metal oxides -- rare earth cobaltites -- strong electron correlations -- antiferromagnetism -- ferromagnetism -- metal–insulator transition -- Earth's mantle -- Hubbard model
Аннотация: We present experimental and theoetical results of spin crossover studies in magnetically ordered materials. The effect of spin crossovers on the electronic structure of transition metal oxides and on the Bose condensation of spin excitons in the vicinity of the spin crossover is considered. A new method for calculating the interatomic superexchange interaction in transition metal oxides is discussed that allows considering selective contributions of excited magnetic cation terms. Changes in the exchange interaction sign are predicted for spin crossovers for d5—d7 ions. In the RCoO3 family of rare-earth cobaltites, the ground state is nonmagnetic, but, as the temperature increases, thermal excitations of high-spin states give rise to a number of experimentally detectable features. In defective RCoO3 samples, stabilization of the high-spin term and ferromagnetic ordering are possible. Dynamical crossovers under external pumping and the dynamics of multiplicity, magnetization, and local lattice distortions are discussed. Geophysical implications of spin crossovers are considered, and metallic properties of Earth's mantle at a depth of 1400—1800 km are predicted.

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Публикация на русском языке Особенности спиновых кроссоверов в магнитных материалах [Текст] / Ю. С. Орлов, С. В. Николаев, В. А. Дудников [и др.] // Успехи физ. наук. - 2023. - Т. 193 № 7. - С. 689–716

Держатели документа:
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences, Academgorodok 50, str. 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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Nearly flat bands and ferromagnetism in the terminated Mn2C MXene / V. V. Kozak, N. A. Fedorova, Ju. S. Olshevskaya [et al.] // Comput. Condens. Matter. - 2023. - Vol. 35. - Ст. e00806, DOI 10.1016/j.cocom.2023.e00806. - Cited References: 76. - This study was supported by the Russian Science Foundation, project no. 21-12-00226 and the JCSS Joint Super Computer Center of the Russian Academy of Sciences. P.V.A. acknowledges the National Research Foundation of the Republic of Korea grant NRF 2021R1A2C1010455 . - ISSN 2352-2143
Кл.слова (ненормированные):
MXene -- Nanomaterials -- B3LYP -- Ferromagnet -- Spintronics -- 2D magnetism -- Half metal -- Hydroxylated/oxygenated/halogenated MXene
Аннотация: Using Density Functional Theory and Periodic Boundary Conditions it is shown that the hydroxylated/oxygenated/halogenated Mn2C monolayer is a 2D ferromagnetic material with a local Mn ions magnetic moment of 2.7μв per unit cell. Upon oxygenation the ferromagnetic coupling between Mn ions can be transformed into a superposition of magnetic states. In particular, the intrinsic magnetic moments in the hydroxylated/halogenated Mn2C monolayer can attain up to 6μB per unit cell. It is found that oxygen termination induces flat bands in the band structure, which evidence for the strong electron correlations and could lead to the implementation of exotic quantum phases in 2D crystals and high-temperature superconductivity. Along with the potential of the hydroxylated Mn2C monolayer characterized by the half-metallicity for application in spintronic devices as a perfect spin injector/detector, this material like other conventional MXenes is promising for the use in energy storage, electromagnetic interference shielding, and sensing.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Department of Chemistry, College of Natural Sciences, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea

Доп.точки доступа:
Kozak, V. V.; Козак, Виктория Валерьевна; Fedorova, N. A.; Olshevskaya, Ju. S.; Kovaleva, A. V.; Shubin, A. A.; Tarasov, A. S.; Тарасов, Антон Сергеевич; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Tomilin, F. N.; Томилин, Феликс Николаевич; Avramov, P. V.
}
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Structure refinement and magnetic properties of synthetic Co3Ge2O5(OH)4 phyllogermanate / N. A. Belskaya, E. K. Khrapova, A. A. Ivanova [et al.] // J. Magn. Magn. Mater. - 2023. - Vol. 587. - Ст. 171262, DOI 10.1016/j.jmmm.2023.171262. - Cited References: 51. - The authors are grateful to Dr. N.V. Kazak and Dr. A.A. Levin for a lot of fruitful discussions. Magnetisation measurements were carried out in the Common Access Facility Centres of SBRAS (Krasnoyarsk, Russia) X-ray powder diffraction measurements were performed at the Engineering Centre of St. Petersburg State Institute of Technology. - The study was supported by grant No. 23-22-00245 of the Russian Science Foundation, https://rscf.ru/project/23-22-00245/ . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
Layered material -- Lizardite structure -- Hydrothermal synthesis -- Crystal structure -- Rietveld method -- Antiferromagnetism/Ferromagnetism
Аннотация: Co3Ge2O5(OH)4 relates to a specific group of 1:1 layered compounds with an ability to form either platy or tubular particles depending on chemical composition. Despite successful synthesis and perspective application, there is a lack of information on its crystal structure and magnetic properties, granted by Co ions. Co3Ge2O5(OH)4 phyllogermanate nanoparticles have been obtained using a hydrothermal method and characterised using powder X-ray diffraction and magnetisation measurements. Triclinic symmetry with a 1:P1 space group has been established. The unit cell contains three layers perpendicular to the c crystallographic direction, with 7.6 Å spacing and –b/3 shift of the middle layer. At a low magnetic field of 100 Oe the compound undergoes a magnetic transition at TN=5.2 K. The field of 9 T is not sufficient to take the sample to a magnetically saturated state with an asymptotic magnetic moment of 2.43 μB/Co2+. The estimations of the intralayer and interlayer exchange constants give values of J1/kB=2.75 K and J2/kB=0.25 K, respectively.

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Держатели документа:
Ioffe Institute, Polytechnicheskaya street, St.-Petersburg, 26194021, Russian Federation
Kirensky Institute of Physics, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, 31, Krasnoyarsky Rabochy Av., Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Belskaya, N. A.; Khrapova, E. K.; Ivanova, A. A.; Eremin, E. V.; Еремин, Евгений Владимирович; Pavlov, S. I.; Krasilin, A. A.
}
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Val'kov, V. V.
Interplay of ferromagnetism and nontrivial topology in triple layers Te-Mn-Te of MnBi2Te4 / V. V. Val'kov, A. O. Zlotnikov, A. Gamov // Spin physics, Spin chemistry and Spin technology", International conference : abstracts : Kazan science week. - Kazan, 2023. - P. 210-211. - Cited References: 4. - РФН № 23-22-10021 ; Красноярский регион. фонд науки

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Держатели документа:
Kirensky Institute of Physics SB RAS

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Gamov, A.; Вальков, Валерий Владимирович; "Spin physics, spin chemistry, and spin technology", Internnational conference(2023 ; 25-30 Sept. ; Kazan, Russia); Казанский физико-технический институт им. Е. К. Завойского Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Казанский научный центр РАН
}
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Ferromagnetism in the terminated Mn2C MXene / F. N. Tomilin, V. V. Kozak, N. A. Fedorova [et al.] // V International Baltic Conference on Magnetism. IBCM : Book of abstracts. - 2023. - P. 18. - Cited References: 1

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS
Siberian Federal University

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Kozak, V. V.; Fedorova, N. A.; Shubin, A.; Tarasov, A. S.; Тарасов, Антон Сергеевич; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; International Baltic Conference on Magnetism(5 ; 2023 ; Aug. 20-24 ; Svetlogorsk, Russia); Балтийский федеральный университет им. И. Канта
}
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Draganyuk, O. N.
Effect of substitution of Mn and Ga atoms by Fe atom in the Mn2GaC MAX phase / O. N. Draganyuk, N. G. Zamkova, V. S. Zhandun // J. Magn. Magn. Mater. - 2022. - Vol. 563. - Ст. 169860, DOI 10.1016/j.jmmm.2022.169860. - Cited References: 40. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project № 20-42-240004: “The effect of the composition, pressure, and dimension on the magnetic, electronic, optical, and elastic properties of the magnetic M n+1 AX n (M = Cr, Mn; Fe, A = Al, Ga, Si, Ge, P, In; X = C, N; n = 1-3) MAX-phases”. The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” ( http://ckp.urcki.ru ). The ternary phase diagrams for the calculation of formation enthalpies were taken from Materials Project ( https://materialsproject.org ) and OQMD ( https://oqmd.org/ ) databases . - ISSN 0304-8853
Кл.слова (ненормированные):
MAX phases -- First-principle calculations -- Doping -- Magnetic properties -- Ferromagnetism -- Monte-Carlo simulations
Аннотация: The magnetic properties of ordered and disordered MAX-phase Mn2-xFe2xGaC and Mn2Ga1-xFexC (x = 12.5, 25, and 50 at.%) have been studied within DFT-GGA. The investigation of phase stability of M2AX phases is performed by comparing the total energy of MAX phases to that of the set of competitive phases for calculation of the phase formation enthalpy. At the small concentration of Fe atoms (x = 12.5 %) compound remains stable. We have found that introducing Fe atom at A-site leads to the forming of ferromagnetic phase with large magnetic moments on magnetic atoms and magnetization. Through detailed group-theoretical analysis we have obtained that only ferromagnetic ordering is possible when Fe atom ordering over Ga sites. The study of exchange constants shows that the out-of-plane Fe-Mn exchange gives the main contribution in appearance of ferromagnetic phase. The temperature dependences of magnetization reveal the increase of Curie temperature in Mn2GaC with Fe atom incorporated into Ga-site.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal Univercity, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Zamkova, N. G.; Замкова, Наталья Геннадьевна; Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Драганюк, Оксана Николаевна
}
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    Enhancement of ferromagnetism and ferroelectricity by oxygen vacancies in mullite Bi2Fe4O9 in the Bi2(Sn0.7Fe0.3)2O7-x matrix / S. S. Aplesnin, L. V. Udod, M. N. Sitnikov [et al.] // J. Magn. Magn. Mater. - 2022. - Vol. 559. - Ст. 169530, DOI 10.1016/j.jmmm.2022.169530. - Cited References: 47 . - ISSN 0304-8853
   Перевод заглавия: Усиление ферромагнетизма и ферроэлектричества в муллите Bi2Fe4O9 в матрице Bi2(Sn0.7Fe0.3)2O7 c кислородными вакансиями
Кл.слова (ненормированные):
Remanent magnetization -- Remanent polarization -- Magnetic hysteresis -- Electrical hysteresis -- Impedance -- Permittivity
Аннотация: A new bismuth pyrostannate-based composite Bi2(Sn0.7Fe0.3)2O7-x/Bi2Fe4O9 (BSFO/BFO) has been obtained by the solid-state synthesis. Temperature dependences of the magnetic hysteresis and remanent magnetization and the nonlinear field dependence of the magnetization for the Bi2Fe4O9 antiferromagnet have been established. A temperature of the formation of canted sublattices in the antiferromagnet with the occurrence of a spontaneous moment in mullite has been determined. The mechanism of the electric polarization hysteresis and the temperature dependence of the remanent polarization have been established. It has been shown, that, below the Néel temperature, the dipole polarization is induced by a lone electron pair of bismuth ions. At T > TN, the migration polarization is caused by the charge carrier density at the chemical potential. A significant increase in the remanent magnetization of mullite in the bismuth pyrostannate matrix with oxygen vacancies over a value typical of polycrystalline mullite has been established. Remanent magnetization is explained in terms of ferron model.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Romanova, O. B.; Романова, Оксана Борисовна; Shabanov, A. V.; Шабанов, Александр Васильевич
}
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10.

Exchange interaction between the high spin Co3+ states in LaCoO3 / Y. S. Orlov, S. V. Nikolaev, V. A. Gavrichkov, S. G. Ovchinnikov // Comput. Mater. Sci. - 2022. - Vol. 204. - Ст. 111134, DOI 10.1016/j.commatsci.2021.111134. - Cited References: 59. - We are thankful to the Russian Science Foundation, Russia for the financial support under the project 18-12-00022 . - ISSN 0927-0256
Кл.слова (ненормированные):
Exchange interaction -- Spin-orbital interaction -- Magnetic phase diagram -- Antiferromagnetism -- Ferromagnetism -- Hubbard model
Аннотация: The formation of the exchange interaction between HS Co3+ ions, which are excited in LaCoO3, is studied within the multielectron approach. Two main contributions appear to be antiferromagnetic (AFM) and ferromagnetic (FM). When the ground state is LS, the total interaction is AFM. The crossover to the HS state may result in the FM ordering. The mean-field magnetic phase diagrams on the plane spin gap-temperature have been calculated without and with spin-orbital interaction in the HS term. Without spin-orbital interaction the reentrant magnetic order is possible. The spin-orbital coupling removes the reentrant phase transition and stabilizes the LS state. For known from experimental data values of the spin gap and exchange interaction, the ideal stoichiometric LaCoO3 is very close to the LS–HS crossover and magnetic ordering border. The violations of local coordination and symmetry of the Co3+-oxygen complexes that take place in the intergrain boundaries, at the surface of single crystals, and in the thin films on the strained substrate, may result in the formation of the HS state and FM order for such materials.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Nikolaev, S. V.; Николаев, Сергей Викторович; Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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11.

Magnetodielectric effect insingle crystals sequence of Pb2Fe2–xMnxGe2O9 (x=0–0.4) / A. L. Freydman, A. I. Pankats, S. A. Skorobogatov [et al.] // Phys. Solid State. - 2022. - Vol. 64, Is. 12. - P. 1912-1918, DOI 10.21883/PSS.2022.12.54385.455. - Cited References: 30. - The research was funded by RFBR, Government of Krasnoyarsk Territory and Krasnoyarsk Territory Science Foundation under scientific projects No. 20-42-243008 and 20-42-240006 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
magnetodielectric effect -- phase transition -- week ferromagnetism
Аннотация: In this work, the magnetodielectric response have been studied in a series of single crystals of Pb2Fe2–xMnxGe2O9 with substitution x from 0 to 0.43. The research results showed that an increase in x leads to a change in the orientation of the antiferromagnetism vector in a zero magnetic field. The application of an external magnetic field leads to spin-flop and spin-reorientation magnetic transitions, which are accompanied by anomalies in the behavior of the permittivity. When Fe3+ ions are replaced by Mn3+ ions, the response of the magnetic subsystem to an external magnetic field changes, which is naturally reflected in the change in the magnetodielectric response. The permittivity changes stepwise when the magnetic subsystem passes into a state with a nonzero vector of the weakly ferromagnetic moment, or when its magnitude and orientation change due to a spin-flop transition. The latter indicates that a sharp change in polarizability is a consequence of a change in the contribution of the exchange energy, as well as the contribution of the Dzyaloshinskii–Moriya term, due to a change in the skew angle between two interacting magnetic moments.

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Публикация на русском языке Магнитодиэлектрический эффект в серии монокристаллов Pb2Fe2-xMnxGe2O9 (x=0–0.4) [Текст] / А. Л. Фрейдман, А. И. Панкрац, С. А. Скоробогатов [и др.] // Физ. тверд. тела. - 2022. - Т. 64 Вып. 12. - С. 1941-1948

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Konstantinov Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, Russia

Доп.точки доступа:
Freydman, A. L.; Фрейдман, Александр Леонидович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Horoshiy, I. N.; Хороший, Иван Николаевич; Kolkov, M. I.; Колков, Максим Игоревич
}
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12.

Sublayer-enhanced growth of highly ordered Mn5Ge3 thin film on Si(111) / I. Yakovlev, I. Tarasov, A. Lukyanenko [et al.] // Nanomaterials. - 2022. - Vol. 12, Is. 24. - Ст. 4365, DOI 10.3390/nano12244365. - Cited References: 23. - The research was funded by Russian Science Foundation, project No. 21-12-00226. The RBS experiment was conducted in REC «Functional Nanomaterials», Immanuel Kant Baltic Federal University under the financial support from the Ministry of Science and Higher Education of the Russian Federation (project FZWN-2020-0008) . - ISSN 2079-4991
Кл.слова (ненормированные):
manganese germanide -- thin film -- MBE -- ferromagnetism -- sublayer
Аннотация: Mn5Ge3 epitaxial thin films previously grown mainly on Ge substrate have been synthesized on Si(111) using the co-deposition of Mn and Ge at a temperature of 390 °C. RMS roughness decreases by almost a factor of two in the transition from a completely polycrystalline to a highly ordered growth mode. This mode has been stabilized by changing the ratio of the Mn and Ge evaporation rate from the stoichiometric in the buffer layer. Highly ordered Mn5Ge3 film has two azimuthal crystallite orientations, namely Mn5Ge3 (001) [1-10] and Mn5Ge3 (001) [010] matching Si(111)[-110]. Lattice parameters derived a (7.112(1) Å) and c (5.027(1) Å) are close to the bulk values. Considering all structural data, we proposed a double buffer layer model suggesting that all layers have identical crystal structure with P6₃/mcm symmetry similar to Mn5Ge3, but orientation and level of Si concentration are different, which eliminates 8% lattice mismatch between Si and Mn5Ge3 film. Mn5Ge3 film on Si(111) demonstrates no difference in magnetic properties compared to other reported films. TC is about 300 K, which implies no significant excess of Mn or Si doping. It means that the buffer layer not only serves as a platform for the growth of the relaxed Mn5Ge3 film, but is also a good diffusion barrier.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, 660041 Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
REC «Functional Nanomaterials», Immanuel Kant Baltic Federal University, 236016 Kaliningrad, Russia

Доп.точки доступа:
Yakovlev, I. A.; Яковлев, Иван Александрович; Tarasov, I. A.; Тарасов, Иван Анатольевич; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Solovyov, L.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Volochaev, M. N.; Волочаев, Михаил Николаевич; Efimov, D.; Goikhman, A.; Bondarev, I. A.; Бондарев, Илья Александрович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Volkov, N. V.; Волков, Никита Валентинович; Tarasov, A. S.; Тарасов, Антон Сергеевич
}
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13.

Ferromagnetism induced by oxygen vacancies in mullite Bi2Fe4O9 / S. S. Aplesnin, L. V. Udod, M. N. Sitnikov [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect. : Low dimensional magnetism. - Ст. C.O1. - P. 327-328. - Cited References: 3 . - ISBN 978-5-94469-051-7

Материалы симпозиума, ,
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \program com.\; Овчинников, Сергей Геннадьевич; Aplesnin, S. S.; Аплеснин, Сергей Степанович; Udod, L. V.; Удод, Любовь Викторовна; Sitnikov, M. N.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Romanova, O. B.; Романова, Оксана Борисовна; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
}
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14.

Magnetic properties of nickel-titanium alloy during martensitic transformations under plastic and elastic deformation / L. I. Kveglis, F. M. Noskov, M. N. Volochaev [et al.] // Symmetry. - 2021. - Vol. 13, Is. 4. - Ст. 665, DOI 10.3390/sym13040665. - Cited References: 61 . - ISSN 2073-8994

РУБ Multidisciplinary Sciences
Рубрики:
NITI SHAPE-MEMORY
   CRYSTAL-STRUCTURE
   WAVE MECHANICS
   TRANSITIONS
Кл.слова (ненормированные):
titanium nickelide -- deformation -- martensitic transformation -- electron diffraction -- ferromagnetism -- clusters
Аннотация: This paper focuses on the processes of the occurrence of magnetization during structure formation in samples of Ni51Ti49 alloy under deformation conditions. The possibility of the existence of a phase with an FCC (face-centered cubic) lattice in titanium nickelide has been demonstrated by electron microscopy and electron diffraction. It has been discovered that the interplanar distances of BCC110 (body-centered cubic), FCC111, and HCP002 (hexagonal close packed) in the alloy under study have similar values, which indicates the possibility of their mutual polymorphic transformation. Based on the modular self-organization, a scheme of martensitic transformations in titanium nickelide from the B2 structure (BCC lattice) to the B19' structure (HCP lattice) through an intermediate phase with an FCC lattice is proposed. It is shown that lenticular crystals appear in the Ni51Ti49 alloy under tensile deformation until rupture, which is accompanied by the onset of ferromagnetism. The effect of magnetization in Ni51Ti49 samples when immersed in liquid nitrogen has been also discovered. In this case, the reason for the appearance and disappearance of magnetization can be associated with microdeformation processes caused by direct and reverse martensitic transitions that occur during cooling and heating of the samples.

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Держатели документа:
Siberian Fed Univ, Polytech Inst, Svobodny Ave 79, Krasnoyarsk 660041, Russia.
Amanjolov East Kazakhstan Univ, Phys Dept, 30th Guards Div Str 34, Ust Kamenogorsk 070002, Kazakhstan.
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Akad Gorodok 50, Akademgorodok 660036, Russia.
Tomsk State Univ, Natl Res, Lenin Ave 36, Tomsk 634050, Russia.
Univ Wroclaw, Fac Chem, 14 F Joliot Curie Str, PL-50383 Wroclaw, Poland.
Ind Univ Tyumen, Ctr Adv Res & Innovat, Volodarsky Str 38, Tyumen 625000, Russia.

Доп.точки доступа:
Kveglis, Ludmila I.; Noskov, Fedor M.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Nyavro, Alexander V.; Filarowski, Aleksander
}
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15.

Inspection probes of a ferromagnetic resonance scanning spectrometer / B. A. Belyaev, N. M. Boev, A. A. Gorchakovsky, R. G. Galeev // Instrum. Exp. Tech. - 2021. - Vol. 64, Is. 2. - P. 277-284, DOI 10.1134/S0020441221010218. - Cited References: 24. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation as part of a complex project on the development of high-technology production facilities (agreement no. 075-11-2019-054, November 22, 2019) . - ISSN 0020-4412
Кл.слова (ненормированные):
Electromagnetic waves -- Ferromagnetic materials -- Ferromagnetism -- Iron alloys -- Nickel alloys -- Probes -- Q factor measurement -- Signal to noise ratio -- Spectrometers -- Frequency ranges -- High Q factor -- Hole diameter -- Local areas -- Permalloy films -- Scanning spectrometer -- Thin magnetic films -- Ferromagnetic resonance
Аннотация: The design of inspection probes for a scanning ferromagnetic resonance spectrometer, which are designed for recording the absorption spectra of electromagnetic energy by local areas of thin magnetic films, is described. The degree of locality is determined by the diameter of the measuring hole of the probe in the range of 0.1–1.0 mm. The sensitivity of the device is significantly increased due to the miniaturization of the heterogeneous measuring resonator and its comparatively high Q factor. A set of replaceable probes makes it possible to cover the frequency range of 0.1–6.0 GHz, the signal-to-noise ratio for a probe with a hole diameter of 0.8 mm, which was measured on a permalloy film with a thickness of 5 nm, is at least 20 dB.

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Публикация на русском языке Измерительные головки сканирующего спектрометра ферромагнитного резонанса [Текст] / Б. А. Беляев, Н. М. Боев, A. A. Горчаковский, Р. Г. Галеев // Приборы и техн. эксперим. - 2021. - № 2. - С. 107-114

Держатели документа:
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660074, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation
AO NPP Radiosvyaz, Krasnoyarsk, 660021, Russian Federation

Доп.точки доступа:
Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Gorchakovsky, A. A.; Горчаковский, Александр Антонович; Galeev, R. G.
}
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16.

Structure and physical properties of hydrogenated (Co + Al)-doped ZnO films: Comparative study with co-doped ZnO films / Y. E. Samoshkina, I. S. Edelman, H. Chou [et al.] // Mater. Sci. Eng. B. - 2021. - Vol. 264. - Ст. 114943, DOI 10.1016/j.mseb.2020.114943. - Cited References: 52. - H.C. thanks the Ministry of Science and Technology of Taiwan for financial support [grant number MOST 108-2112-M-110-003]. The scanning electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by Ministry of Science and Higher Education of the Russian Federation [state assignment number FSRZ-2020-0011]. X-ray diffraction data were obtained using analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 0921-5107
Кл.слова (ненормированные):
(Co + Al)-doped ZnO -- Co-doped ZnO -- Diluted oxides -- Thin films -- Hydrogenation -- Room temperature ferromagnetism
Аннотация: (Co + Al)-doped ZnO films have been synthesized by the RF magnetron sputtering. Films of this composition have first been obtained in mixed atmosphere of Ar + H2. High hydrogen concentration of 20–50% has been used together with high enough substrate temperature of 450 °C. The used technological conditions affected the morphology, chemical composition, optical, electric, and magnetic properties of the films to an even more than in the case of Co-doped ZnO films synthesized under the same conditions and studied earlier. The films exhibit ferromagnetic behavior at room temperature with much greater magnetization and magneto-optical activity compared to the Co-doped films. At the same time, the hydrogenated films show an increase in electric conductivity in comparison with samples synthesized in the atmosphere of Ar + O2. The magnetic nature of the hydrogenated films has been associated with the defect-related mechanism.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Physics, National Sun Yat-sen University, Kaohsiung, 80424, Taiwan
Department of Applied Physics, National University of Kaohsiung, Kaohsiung, 81148, Taiwan
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Chou, H.; Lin, H. -C.; Dwivedi, G. D.; Petrov, D. A.; Петров, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Zeer, G. M.; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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17.

Emergence of ferromagnetism in nanoparticles of BeTiO3 ceramic with the perovskite structure / A. V. Pavlov, L. I. Kveglis, D. N. Saprykin [et al.] // Inorg. Mater.: Appl. Res. - 2021. - Vol. 12, Is. 1. - P. 88-93, DOI 10.1134/S2075113321010330. - Cited References: 21. - The part of the work involving calculations was supported by the Russian Science Foundation (grant no. 18-19-00268) . - ISSN 2075-1133
Кл.слова (ненормированные):
titanium dioxide nanopowder -- rutile structure -- beryllium ceramic -- magnetic hysteresis -- electrical resistance -- electronic structure -- icosahedral clusters
Аннотация: Emergence of ferromagnetism and an increase in the electrical conductance of BeTiO3 beryllium ceramic with the perovskite structure were discovered experimentally. To explain the reason for appearance of the metallic properties, models are proposed, and calculations of the electronic structure of nanoclusters with different short-range order are performed.

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Публикация на русском языке Появление ферромагнетизма в наночастицах керамики со структурой перовскита BeTiO3 [Текст] / А. В. Павлов, Л. И. Квеглис, Д. Н. Сапрыкин [и др.] // Материаловедение. - 2020. - № 5. - С. 15-20

Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Sarsen Amanzholov East Kazakhstan State University, Ust’-Kamenogorsk, 070000, Kazakhstan
Tomsk State University, Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Pavlov, A. V.; Kveglis, L. I.; Saprykin, D. N.; Nasibullin, R. T.; Kalitova, A. A.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Nemtsev, I. V.; Немцев, Иван Васильевич; Kantai, N.
}
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18.

    Влияние охлаждения на возникновение намагниченности в никелиде титана / А. В. Достовалов, Ф. М. Носков, В. С. Жигалов, А. В. Нявро // Изв. Алт. гос. ун-та. - 2021. - № 1 (117). - С. 17-20, DOI 10.14258/izvasu(2021)1-02. - Библиогр.: 15 . - ISSN 1561-9443. - ISSN 1561-9451
   Перевод заглавия: Effect of cooling on the occurrence of magnetization in titanium nickelide
Кл.слова (ненормированные):
никелид титана -- ферромагнетизм -- микродеформации -- магнитометрия -- структура и свойства -- Ni-Ti alloy -- ferromagnetism -- microstrains -- magnetometry -- structure and properties
Аннотация: Вопрос возникновения намагниченности в сплавах системы никель-титан до сих пор изучен недостаточно. Наши ранние работы показали возможность возникновения намагниченности при многократных циклах прямых и обратных мартенситных переходах в сплаве Ni51Ti49, а также после деформации этого сплава растяжением до разрыва. Представленная работа посвящена выявлению эффекта намагниченности в образцах сплава Ni51Ti49 в результате их однократного охлаждения в жидком азоте, а также исчезновению намагниченности при нагревании образцов до комнатной температуры. С помощью индукционного петлескопа выявлено, что непосредственно после охлаждения образец имел высокую намагниченность. По мере нагревания образца петли гистерезиса изменяются, приобретая меньший наклон к горизонтальной оси, что свидетельствует об уменьшении магнитной индукции практически до нуля с повышением температуры до комнатной. Причину появления и исчезновения намагниченности можно связать с микродеформационными процессами, проходящими при охлаждении и нагревании образцов, связанными с прямым и обратным мартенситными переходами.
The occurrence of magnetization in alloys of the nickel-titanium system is still studied insufficiently. Our early work showed the possibility of magnetization arising during multiple cycles of forward and reverse martensitic transitions in the Ni51Ti49 alloy, as well as after deformation of this alloy by tensile stress to rupture. The purpose of this paper is devoted to revealing the effect of magnetization in samples of the Ni51Ti49 alloy as a result of their single cooling in liquid nitrogen, as well as the disappearance of magnetization when the samples are heated to room temperature. Using an induction hysteresigraph it is found out that the sample has a high magnetization immediately after cooling. As the sample is heated, the hysteresis loops change, acquiring a smaller inclination to the horizontal axis. It indicates a decrease in the magnetic induction to almost zero as the temperature rises to room temperature. The reason for the occurrence and disappearance of magnetization can be associated with micro-deformation processes related to forward and reverse martensitic transitions during cooling and heating of the samples.

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РИНЦ
Держатели документа:
Сибирский федеральный университет (Красноярск, Россия)
Институт физики им. Л.В. Киренского (Красноярск, Россия)
Национальный исследовательский Томский государственный университет (Томск, Россия)

Доп.точки доступа:
Достовалов, А. В.; Носков, Ф. М.; Жигалов, Виктор Степанович; Zhigalov, V. S.; Нявро, А. В.
}
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19.

Martynov, S. N.
Ground State of a Two-Sublattice Anisotropic Ferromagnet in a Magnetic Field / S. N. Martynov // Phys. Solid State. - 2021. - Vol. 63, Is. 8. - P. 1253-1261, DOI 10.1134/S1063783421080199. - Cited References: 38. - This study was supported by the Russian Foundation for Basic Research and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-240006 "Synthesis and Study of Pb2+-and Bi3+Containing Oxide Single Crystals with Partial Substitution in One of the Subsystems: Magnetic Structures and Magnetodielectric Effect" . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
ANTIFERROMAGNETIC-RESONANCE
SUPEREXCHANGE INTERACTION
WEAK FERROMAGNETISM
Кл.слова (ненормированные):
ferromagnetism -- single-ion anisotropy -- antisymmetric exchange -- orientational phase transition
Аннотация: The ground state of a classical two-sublattice ferromagnet with the noncollinear single-ion anisotropy axes of the sublattices and the antisymmetric and anisotropic symmetric exchanges between them has been investigated in a magnetic field applied along the hard magnetization directions in the crystal. The threshold relations for the parameters of the anisotropic interactions have been obtained, which determine the choice of the ground state among the three possible magnetic phases. Depending on the ground state type and the field direction, the transition between the phases is a first- or second-order phase transition. The antisymmetric exchange value above which the reorientation between the noncollinear phases ends with a second-order transition depends on the angle between the local easy axes and the single-ion anisotropy value. Field dependences of the magnetization and susceptibility for different ground states have been calculated. A comparison with the results of the magnetic measurements in the highly anisotropic PbMnBO4 ferromagnet has been made.

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Публикация на русском языке Мартынов, Сергей Николаевич. Основное состояние двухподрешеточного анизотропного ферромагнетика в магнитном поле [Текст] / С. Н. Мартынов // Физ. тверд. тела. - 2021. - Т. 63 Вып. 8. - С. 1090-1097

Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Мартынов, Сергей Николаевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Krasnoyarsk Territorial Foundation [20-42-240006]
}
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20.

Satsuk, S. A.
Micromagnetic modeling of the polycrystalline structure effect to the hysteresis loop in ferromagnetic nanowire / S. A. Satsuk, S. V. Komogortsev // Journal of Physics: Conference Series. - 2021. - Vol. 1847, Is. 1. - Ст. 012045, DOI 10.1088/1742-6596/1847/1/012045. - Cited References: 32. - This work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project 18-42-240006
Кл.слова (ненормированные):
Crystallite size -- Ferromagnetic materials -- Ferromagnetism -- Hysteresis -- Hysteresis loops -- Nanowires -- Ferromagnetic nanowire -- Magnetic anisotropy constant -- Magnetic anisotropy energy -- Micromagnetic modeling -- Micromagnetic simulations -- Non-monotonic dependence -- Numerical calculation -- Polycrystalline structure -- Magnetic anisotropy
Аннотация: Extensive micromagnetic simulation results of the hysteresis loops in ferromagnetic nanowire with randomly oriented crystallites ordered in one chain is presented. Three main contributions to the magnetic energy of the wire had been taken into account: exchange, dipole-dipole, and the magnetic anisotropy energy of the crystallite. In cases where one of the three contributions to the energy can be neglected, the numerical calculations are in good agreement with the results of the well-known, analytically studied micromagnetic problems. In the case when all three contributions are comparable, a complex non-monotonic dependence of the coercive force on the crystallite size and the magnetic anisotropy constant is observed. In order to interpret these changes, a new micromagnetic scale is introduced, which takes into account all three contributions to the magnetic energy of the wire, and performs a correct transition to the analytically studied limits, which take into accountthe competition of any two contributions.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50 Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Сацук, Светлана Александровна; Dynamic Systems and Computer Science: Theory and Applications(2021 : Oct. 19-22 ; Irkutsk, Russian Federation)
}
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