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Cobalt ferrite nanoparticles in a mesoporous silicon dioxide matrix / S. V. Komogortsev [et al.] // Tech. Phys. Lett. - 2009. - Vol. 35, Is. 10. - P. 882-884, DOI 10.1134/S1063785009100022. - Cited References: 10. - This study was supported in part by the Federal Program "Development of the Scientific Potential of Higher Education" (project no. RNP. 2.1.1/2584) and jointly by the Krasnoyarsk Regional Science Foundation and the Russian Foundation for Basic Research (project nos. r-Enisei-a 03-07-96803 and 09-02-98002-r_sibir'_a). . - ISSN 1063-7850

РУБ Physics, Applied
Рубрики:
MAGNETIC-PROPERTIES
   NANOSIZED COFE2O4
   ANISOTROPY
   POWDERS
   CURVES
Аннотация: We have studied magnetic nanoparticles of cobalt ferrite obtained by the extraction-pyrolysis method in a mesoporous silicon dioxide (MSM-41) molecular sieve matrix. The X-ray diffraction data show evidence for the formation of CoFe(2)O(4) particles with a coherent scattering domain size of similar to 40 nm. Measurements of the magnetization curves showed that powders consisting of these nanoparticles are magnetically hard materials with a coercive field of H (c)(4.2 K) = 9.0 kOe and H (c)(300 K) = 1.8 kOe and a reduced remanent magnetization of M (r)/M (s)(4.2 K) = 0.83 and M (r)/M (s)(300 K) = 0.49. The shape of the low-temperature (4.2 K) magnetization curves is adequately described in terms of the Stoner-Wohlfarth model for randomly oriented single-domain particles with a cubic magnetic anisotropy.

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Держатели документа:
[Komogortsev, S. V.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Branch, Inst Chem & Chem Technol, Krasnoyarsk 660036, Russia
Siberian State Technol Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН
ИХХТ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian State Technological University, Krasnoyarsk 660049, Russian Federation

Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Patrusheva, T. N.; Патрушева, Тамара Николаевна; Balaev, D. A.; Балаев, Дмитрий Александрович; Denisova, E. A.; Денисова, Елена Александровна; Ponomarenko, I. V.; Development of the Scientific Potential of Higher Education [RNP. 2.1.1/2584]; Krasnoyarsk Regional Science Foundation; Russian Foundation for Basic Research [r-Enisei-a 03-07-96803, 09-02-98002-r_sibir'_a]
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Ignatchenko, V. A.
The effect of correlation-properties of inhomogeneities on plasma excitations in a metal / V. A. Ignatchenko, Yu. I. Mankov // J. Phys.: Condens. Matter. - 1991. - Vol. 3, Is. 31. - P. 5837-5845, DOI 10.1088/0953-8984/3/31/007. - Cited References: 21 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
SPIN-WAVES
ANISOTROPY
Аннотация: We theoretically investigate the manifestations of the non-monotonic character and anisotropic peculiarities of the correlation functions of the inhomogeneities in the dispersion law and damping of plasma waves. The following specific effects have been found: a change in the character of the modifications, dispersion law and damping for small wavenumbers; dependence of the plasma frequency shift on the direction of the wave propagation. We substantiate possibilities for developing the correlation spectroscopy of plasma waves which would enable us not only to measure a correlation radius of the inhomogeneities (this has been suggested earlier), but also to obtain information in the form of the correlation function.

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Держатели документа:
Kirensky Inst. of Phys., Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mankov, Yu. I.; Маньков, Юрий Иннокентьевич; Игнатченко, Вальтер Алексеевич
}
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Plasma-spraying Co-Ni-Fe-B-Si amorphous alloys. Structure and magnetic properties / A. A. Lepeshev [и др.] // Pisma Zhurnal Tek. Fiz. - 1995. - Vol. 21, Is. 16. - P. 22-26. - Cited References: 8 . - ISSN 0320-0116

РУБ Physics, Applied
Рубрики:
ANISOTROPY

WOS

Доп.точки доступа:
Lepeshev, A. A.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Denisova, E. A.; Денисова, Елена Александровна; Saunin, V. N.
}
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    Ivanov, A. A.
    Self-organization of the magnetization in ferromagnetic nanowires / A. A. Ivanov, V. A. Orlov // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 217-220, DOI 10.1016/j.jmmm.2016.12.053. - Cited References:21. - This study was supported by RFBR, Project no. 14-02-00238-a . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Самоорганизация намагниченности в ферромагнитных нанопроволоках

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SYSTEM
ANISOTROPY
Кл.слова (ненормированные):
Domain wall -- Nanowire -- Magnetic inhomogeneities -- Stochastic domains
Аннотация: In this work we demonstrate the occurrence of the characteristic spatial scale in the distribution of magnetization unrelated to the domain wall or crystallite size with using computer simulation of magnetization in a polycrystalline ferromagnetic nanowire. This is the stochastic domain size. We show that this length is included in the spectral density of the pinning force of domain wall on inhomogeneities of the crystallographic anisotropy. The constant and distribution of easy axes directions of the effective anisotropy of stochastic domain, are analytically calculated.

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Доп.точки доступа:
Orlov, V. A.; Орлов, Виталий Александрович; RFBR [14-02-00238-a]; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk)"Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
}
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Mankov, Y. I.
Effect of surface fixing of remagnetization on magnetoresistance of thin ferromagnetic layers / Y. I. Mankov // Fiz. Tverd. Tela. - 1994. - Vol. 36, Is. 12. - P. 3634-3637. - Cited References: 8 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
ANISOTROPY

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Effects of exchange interaction in bilayer DyxCo1-x/NiFe films in the vicinity of compensation compositions of amorphous DyCo alloys / R. S. Iskhakov [et al.] // JETP Letters. - 2004. - Vol. 80, Is. 10. - P. 638-641, DOI 10.1134/1.1857270. - Cited References: 12 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
SPIN-WAVE RESONANCE
ANISOTROPY
Аннотация: The displacement field of the hysteresis loop due to exchange anisotropy in planar DyCo/NiFe systems is studied experimentally as a function of the concentration of the rare-earth element. The bilayer DyCo/NiFe film system is characterized by an orthogonal arrangement of the effective magnetizations of separate layers under the condition that the amorphous DyCo layer is prepared in the region of magnetic compensation. An analysis of the dependence of the displacement field on the Dy concentration has led to an understanding of the physical mechanism of the formation of the exchange anisotropy in these planar systems. (C) 2004 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirenskii Inst. of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Krasnoyarsk State University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Seredkin, V. A.; Середкин, Виталий Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Frolov, G. I.; Фролов, Георгий Иванович; Yakovchuk, V. Y.
}
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Frolov, G. I.
Studying the mechanism of exchange coupling in ferro/ferrimagnet NiFe/DyCo film structures / G. I. Frolov, V. A. Seredkin, V. Y. Yakovchuk // Tech. Phys. Lett. - 2010. - Vol. 36, Is. 1. - P. 57-59, DOI 10.1134/S1063785010010189. - Cited References: 7. - This study was supported in part by the Program for Development of the Scientific Potential of Russian Universities (project no. RNP.2.1.1/4399). . - ISSN 1063-7850

РУБ Physics, Applied
Рубрики:
ANISOTROPY
Аннотация: Dependence of the magnetic and magnetooptical properties of an exchange-coupled NiFe/DyCo bilayer system on the thickness (t (DyCo)) of a magnetically hard layer has been studied. It is established that the unidirectional anisotropy vanishes at t (DyCo) similar to 400 , while the coercive field in the magnetically soft layer becomes comparable to the exchange-induced field shift. In this case, the DyCo layer magnetization is almost parallel to the film plane, whereas a reference DyCo film exhibits a perpendicular anisotropy. A model of the magnetic state of layers in the ferro/ferrimagnetic layer structure under consideration is proposed, which assumes that a 180A degrees domain wall is formed at the interface upon magnetization reversal in the magnetically soft layer.

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Держатели документа:
[Frolov, G. I.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk, Russia
Siberian State Aerosp Univ, Krasnoyarsk, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Seredkin, V. A.; Середкин, Виталий Александрович; Yakovchuk, V. Y.; Фролов, Георгий Иванович
}
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Thermomagnetic data writing and erasing in DyCo/NiFe (TbFe/NiFe) film structures / V. A. Seredkin [et al.] // Tech. Phys. Lett. - 2004. - Vol. 30, Is. 10. - P. 820-822, DOI 10.1134/1.1813720. - Cited References: 10 . - ISSN 1063-7850

РУБ Physics, Applied
Рубрики:
SPIN-WAVE RESONANCE
ANISOTROPY
LAYERS
Аннотация: A new principle of data writing and erasing is proposed based on the exchange coupling between magnetic layers with mutually orthogonal orientations of the effective magnetization. The new method provides for a significant decrease in energy consumption. The possibility of using bilayer magnetic films of the (rare earth metal-transition metal)/NiFe type possessing unidirectional anisotropy as the media for thermomagnetic writing and erasing of magnetooptical data is studied. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk, Russia
ИФ СО РАН

Доп.точки доступа:
Seredkin, V. A.; Середкин, Виталий Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Frolov, G. I.; Фролов, Георгий Иванович; Yakovchuk, V. Y.
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Magnetic field effect and dielectric anomalies at the spin reorientation phase transition of GdFe3(BO3)(4) / F. . Yen [et al.] // Phys. Rev. B. - 2006. - Vol. 73, Is. 5. - Ст. 54435, DOI 10.1103/PhysRevB.73.054435. - Cited References: 21 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
IRON BORATE GDFE3(BO3)(4)
   HOMNO3
   ANISOTROPY
   PR
   SM
Аннотация: GdFe3(BO3)(4) exhibits a structural phase transition at 156 K, antiferromagnetic order of the Fe3+ moments at 36 K, followed by a spin reorientation phase transition at 9 K. The reorientation phase transition is studied through dielectric, magnetic, and heat capacity measurements under the application of external magnetic fields of up to 7 kOe. The dielectric constant indicates the existence of two distinct anomalies at T-SR=9 K that separate in temperature under external magnetic fields. The spin rotation phase transition is proven to be of the first-order nature through the magnetic analog of the Clausius-Clapeyron equation. Magnetodielectric effect of up to 1% is observed at 8 K and 7 kOe. The uniaxial magnetocaloric effect along the c axis is observed below the spin reorientation phase transition of 9 K.

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Держатели документа:
Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA
Univ Houston, Dept Phys, Houston, TX 77204 USA
Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China
Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
Moscow MV Lomonosov State Univ, Fac Phys, Moscow 119992, Russia
ИФ СО РАН
Texas Center for Superconductivity of the University of Houston, Department of Physics, University of Houston, Houston, TX 77204-5002, United States
Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, United States
Hong Kong University of Science and Technology, Hong Kong, Hong Kong
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Faculty of Physics, Moscow State University, Moscow, 119992, Russian Federation

Доп.точки доступа:
Yen, F.; Lorenz, B.; Sun, Y. Y.; Chu, C. W.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. N.
}
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10.

Man'kov, Y. I.
Effect of conduction electrons on the law of approach to saturation of a metallic ferromagnet with surface pinning of the magnetic moment / Y. I. Man'kov // Phys. Solid State. - 1999. - Vol. 41, Is. 4. - P. 582-588, DOI 10.1134/1.1130829. - Cited References: 37 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
ANISOTROPY
Аннотация: The effect of conduction electrons on the magnetization curve of a metallic ferromagnet with surface pinning of the magnetic moment is investigated theoretically. The electronic contribution is due to the rearrangement of the discrete spectrum of charge carriers trapped by the nonuniform magnetic induction of such a ferromagnet, and it is a kind of diamagnetic effect that appreciably decreases the volume-averaged magnetization of the ferromagnet. A power-law dependence H-3/4 on the external magnetic field H is obtained according to the law of magnetization approach to saturation. This dependence is due to the contribution of the conduction electrons. (C) 1999 American Institute of Physics. [S1063-7834(99)01804-3].

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Russian Acad Sci, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
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11.

Asymmetric interfaces in epitaxial off-stoichiometric Fe3+xSi1-x/Ge/Fe3+xSi1-x hybrid structures: Effect on magnetic and electric transport properties / A. S. Tarasov, I. A. Tarasov, I. A. Yakovlev [et al.] // Nanomaterials. - 2022. - Vol. 12, Is. 1. - Ст. 131, DOI 10.3390/nano12010131. - Cited References: 61. - The research was funded by RFBR, Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science, project number 20-42-243007, and by the Government of the Russian Federation, Mega Grant for the Creation of Competitive World-Class Laboratories (Agreement no. 075-15-2019-1886). I.A.T. and S.N.V. thank RFBR, Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science, project number 20-42-240012, for partial work related to the development of the simulation model of the pore autocorrelated radial distribution function coupled with the near coincidence site model, the Fe3+xSi1-x lattice distortion analysis, and processing Rutherford backscattering spectroscopy data. The Rutherford backscattering spectroscopy measurements were supported by the Ministry of Science and Higher Education of the Russian Federation (project FZWN-2020-0008) . - ISSN 2079-4991

РУБ Chemistry, Multidisciplinary + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied
Рубрики:
FILMS
   ANISOTROPY
   SI(001)
   DEVICES
   SURFACE
   GROWTH
Кл.слова (ненормированные):
iron silicide -- germanium -- molecular beam epitaxy -- epitaxial stress -- lattice distortion -- dislocation lattices -- FMR -- Rutherford backscattering -- spintronics
Аннотация: Three-layer iron-rich Fe3+xSi1-x/Ge/Fe3+xSi1-x (0.2 < x < 0.64) heterostructures on a Si(111) surface with Ge thicknesses of 4 nm and 7 nm were grown by molecular beam epitaxy. Systematic studies of the structural and morphological properties of the synthesized samples have shown that an increase in the Ge thickness causes a prolonged atomic diffusion through the interfaces, which significantly increases the lattice misfits in the Ge/Fe3+xSi1-x heterosystem due to the incorporation of Ge atoms into the Fe3+xSi1-x bottom layer. The resultant lowering of the total free energy caused by the development of the surface roughness results in a transition from an epitaxial to a polycrystalline growth of the upper Fe3+xSi1-x. The average lattice distortion and residual stress of the upper Fe3+xSi1-x were determined by electron diffraction and theoretical calculations to be equivalent to 0.2 GPa for the upper epitaxial layer with a volume misfit of -0.63% compared with a undistorted counterpart. The volume misfit follows the resultant interatomic misfit of |0.42|% with the bottom Ge layer, independently determined by atomic force microscopy. The variation in structural order and morphology significantly changes the magnetic properties of the upper Fe3+xSi1-x layer and leads to a subtle effect on the transport properties of the Ge layer. Both hysteresis loops and FMR spectra differ for the structures with 4 nm and 7 nm Ge layers. The FMR spectra exhibit two distinct absorption lines corresponding to two layers of ferromagnetic Fe3+xSi1-x films. At the same time, a third FMR line appears in the sample with the thicker Ge. The angular dependences of the resonance field of the FMR spectra measured in the plane of the film have a pronounced easy-axis type anisotropy, as well as an anisotropy corresponding to the cubic crystal symmetry of Fe3+xSi1-x, which implies the epitaxial orientation relationship of Fe3+xSi1-x (111)[0-11] || Ge(111)[1-10] || Fe3+xSi1-x (111)[0-11] || Si(111)[1-10]. Calculated from ferromagnetic resonance (FMR) data saturation magnetization exceeds 1000 kA/m. The temperature dependence of the electrical resistivity of a Ge layer with thicknesses of 4 nm and 7 nm is of semiconducting type, which is, however, determined by different transport mechanisms.

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Держатели документа:
RAS, Fed Res Ctr KSC SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia.
RAS, Fed Res Ctr KSC SB, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
RAS, Boreskov Inst Catalysis SB, Synchrotron Radiat Facil SKIF, Nikolskiy Prospekt 1, Koltsov 630559, Russia.
Immanuel Kant Balt Fed Univ, REC Smart Mat & Biomed Applicat, Kaliningrad 236041, Russia.
Immanuel Kant Balt Fed Univ, REC Funct Nanomat, Kaliningrad 236016, Russia.
Univ Duisburg Essen, Fac Phys, D-47057 Duisburg, Germany.
Univ Duisburg Essen, Ctr Nanointegrat, D-47057 Duisburg, Germany.

Доп.точки доступа:
Tarasov, A. S.; Тарасов, Антон Сергеевич; Tarasov, I. A.; Тарасов, Иван Анатольевич; Yakovlev, I. A.; Яковлев, Иван Александрович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Bondarev, I. A.; Бондарев, Илья Александрович; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Efimov, Dmitriy D.; Goikhman, Aleksandr Yu.; Belyaev, B. A.; Беляев, Борис Афанасьевич; Baron, F. A.; Барон, Филипп Алексеевич; Shanidze, Lev V.; Шанидзе, Лев Викторович; Farle, M.; Фарле, Михаель; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Volkov, N. V.; Волков, Никита Валентинович; RFBRRussian Foundation for Basic Research (RFBR); Krasnoyarsk Regional Fund of Science [20-42-243007, 20-42-240012]; Government of the Russian Federation [075-15-2019-1886]; Ministry of Science and Higher Education of the Russian Federation [FZWN-2020-0008]
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12.

Structural features and magnetic properties of Co-W films / V. O. Vas'kovskiy, M. N. Volochaev, A. N. Gorkovenko [et al.] // Phys. Solid State. - 2021. - Vol. 63. Is. 7. - P. 1113-1119, DOI 10.1134/S1063783421070246. - Cited References: 23. - This work was carried out with support by the Ministry of Science and Higher Education of the Russian Federation, topic no. FEUZ-2020-0051. . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
GIANT MAGNETORESISTANCE
ANISOTROPY
Кл.слова (ненормированные):
film -- doping -- substrate -- structure -- magnetic properties
Аннотация: The structure and magnetic properties of thin polycrystalline films of Co100 – xWx (0 ≤ x ≤ 30) deposited by magnetron sputtering on glass substrates are investigated including those containing buffer layers of Ta, W, and Ru. It is found that films of pure Co are non-single-phase and contain hcp and fcc crystalline modifications. Doping leads to an increase in the concentration of the fcc phase and an enhancement of the texture of the (111) type, and subsequently to the amorphization of the films. The buffer layers influence to a certain extent on the depth and concentration localization of these transformations. A characteristic feature of the magnetism of Co–W films is a significant perpendicular component in the macroscopic magnetic anisotropy, which leads to a “supercritical” magnetic state. It is shown that its source is the textured fcc phase, the crystalline anisotropy of which is enhanced as a result of doping of cobalt with tungsten.

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Публикация на русском языке Структурные особенности и магнитные свойства пленок Co–W [Текст] / В. О. Васьковский, М. Н. Волочаев, А. Н. Горьковенко [и др.] // Физ. тверд. тела. - 2021. - Т. 63 Вып. 7. - С. 915-922

Держатели документа:
Ural Fed Univ, Ekaterinburg, Russia.
Russian Acad Sci, Inst Met Phys, Ural Branch, Ekaterinburg, Russia.
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk, Russia.

Доп.точки доступа:
Vas'kovskiy, V. O.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Gorkovenko, A. N.; Kravtsov, E. A.; Lepalovskij, V. N.; Feshchenko, A. A.; Ministry of Science and Higher Education of the Russian Federation [FEUZ-2020-0051]
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13.

Tailoring the microwave properties of thin permalloy films using a periodically grooved substrate / A. V. Izotov, B. A. Belyaev, N. M. Boev [et al.] // Physica B. - 2022. - Vol. 629. - Ст. 413654, DOI 10.1016/j.physb.2021.413654. - Cited References: 50. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation, agreement number 075-11-2019054 dated November 22, 2019 . - ISSN 0921-4526. - ISSN 1873-2135

РУБ Physics, Condensed Matter
Рубрики:
FERROMAGNETIC-RESONANCE
   MAGNETIC-PROPERTIES
   ANISOTROPY
   FREQUENCY
Кл.слова (ненормированные):
Patterned film -- Topography-induced anisotropy -- Netzelmann approach -- Ferromagnetic resonance -- Damping parameter
Аннотация: Thin magnetic films with periodic surface topography are of special interest for microwave applications as their static and dynamic magnetic characteristics can be readily adjusted. In this paper, we explore the capabilities of a simple method for producing large-area periodically patterned films by creating regularly spaced grooves on a substrate using a diamond cutter. For 110-nm-thick films, it was found that the substrate-topography-induced magnetic anisotropy was inversely proportional to the pattern period, which in experimental samples varied from 5 to 20 mu m. Based on the Netzelmann theory, analytical expressions for demagnetization tensor components were obtained, which accord well with the experimental data. The measurements of the natural ferromagnetic resonance spectra demonstrated that the increase of the topography-induced magnetic anisotropy with the decrease of the pattern period led to the increase of the resonance frequency from 0.65 to 1.86 GHz, and to a decrease of the linewidth and effective damping parameter.

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Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Boev, N. M.; Боев, Никита Михайлович; Burmitskikh, A. V.; Бурмитских, Антон Владимирович; Leksikov, An. A.; Лексиков, Андрей Александрович; Skomorokhov, G. V.; Скоморохов, Георгий Витальевич; Solovev, P. N.; Соловьев, Платон Николаевич; Ministry of Science and Higher Education of the Russian Federation [075-11-2019054]
}
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14.

    Effects of inelastic spin-dependent electron transport through a spin nanostructure in a magnetic field / V. V. Val'Kov, S. V. Aksenov // J. Exp. Theor. Phys. - 2011. - Vol. 113, Is. 2. - P266-275, DOI 10.1134/S1063776111060070. - Cited Reference Count: 30. - Гранты: This study was carried out under the program of the Physical Science Department of the Russian Academy of Sciences, Federal Target Program "Scientific and Scientific-Pedagogical Personnel of Innovative Russia in 2009-2013," Interdisciplinary Integration project no. 53 of the Siberian Branch of the Russian Academy of Sciences, and under partial support from the Russian Foundation for Basic Research (project no. 09-02-00127). The research work of one of the authors (S.V.A) was supported by grant no. MK-1300.2011.2 from the President of the Russian Federation. - Финансирующая организация: Russian Foundation for Basic Research [09-02-00127]; Russian Federation [MK-1300.2011.2] . - AUG. - ISSN 1063-7761
Рубрики:
CONDUCTION
   ANISOTROPY
   JUNCTIONS
Кл.слова (ненормированные):
antiferromagnetic coupling -- colossal magnetoresistance effect -- iv characteristics -- metallic contacts -- potential profiles -- spectral characteristics -- spin dependent transport -- spin dimer -- spin moments -- spin-dependent electron transport -- spin-flip process -- tight-binding approximations -- transmission coefficients -- antiferromagnetism -- colossal magnetoresistance -- current voltage characteristics -- electric resistance -- nanostructures -- transport properties -- magnetic field effects
Аннотация: The transport properties and current-voltage (I-V) characteristics of a system of spin dimers with antiferromagnetic coupling arranged between metallic contacts are investigated in the tight binding approximation using the Landauer-Buttiker formalism. It is shown that the s-d(f) exchange interaction between the spin moments of the electrons being transported and the spins of the nanostructure leads to the formation of a potential profile as well as its variation due to spin-flip processes. As a result, the spin-dependent transport becomes inelastic, and the transmission coefficient and the I-V characteristic are strongly modified. It is found that the application of a magnetic field induces additional transparency peaks in the spectral characteristic of the system and causes the colossal magnetoresistance effect.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Reshetnikov Siberian State Aerosp Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Val'kov, V. V.; Вальков, Валерий Владимирович; Aksenov, S.V.
}
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15.

    FMR and TEM Studies of Co and Ni Nanoparticles Implanted in the SiO2 Matrix / I. S. Edelman [et al.] // Appl. Magn. Reson. - 2011. - Vol. 40, Is. 3. - P363-375, DOI 10.1007/s00723-011-0218-4. - Cited Reference Count: 51. - Гранты: The work was supported in part by the Russian Foundation for Basic Research, grant no. 11-02-00972-a, Ministry of Education and Science of the Russian Federation, Federal Target Program "Scientific and scientific-pedagogical personnel of innovative Russia'', contract no. 02.740.11.0797, and State Program "Development of the Scientific Potential of the Higher Education School'', project no. 2.1.1/6038. S.M. Zharkov acknowledges the financial support of the Russian government contract no. 02.740.11.0568. The electron microscopy investigations were carried out at the Joint Center of the Siberian Federal University. - Финансирующая организация: Russian Foundation for Basic Research [11-02-00972-a]; Ministry of Education and Science of the Russian Federation [02.740.11.0797]; State Program "Development of the Scientific Potential of the Higher Education School'' [2.1.1/6038]; Russian government [02.740.11.0568] . - MAY. - ISSN 0937-9347. - ISSN 1613-7507
Рубрики:
FERROMAGNETIC-RESONANCE
   MAGNETIC-PROPERTIES
   THIN-FILMS
   COBALT NANOPARTICLES
   ION-IMPLANTATION
   FINE PARTICLES
   GRANULAR FILMS
   ANISOTROPY
   POLYIMIDES
   RUTILE
Кл.слова (ненормированные):
energy dispersive x ray spectroscopy -- face-centered cubic structure -- fused silica plates -- g factors -- hexagonal close packing -- high dose -- high-dose implantation -- implantation dose -- implanted samples -- line shape -- magnetic parameters -- matrix -- metal nanoparticles -- ni nanoparticles -- nonsymmetric -- out-of-plane -- room temperature -- spherical shape -- subsurface layer -- tem -- temperature dependence -- thin magnetic films -- uniaxial magnetic anisotropy -- cobalt -- fused silica -- magnetic anisotropy -- nanoparticles -- silica -- silicon compounds -- transmission electron microscopy -- x ray spectroscopy -- ferromagnetic resonance
Аннотация: Fused silica plates have been implanted with 40 keV Co+ or Ni+ ions to high doses in the range of (0.25-1.0) x 10(17) ions/cm(2), and magnetic properties of the implanted samples have been studied with ferromagnetic resonance (FMR) technique supplemented by transmission electron microscopy, electron diffraction and energy dispersive X-ray spectroscopy. The high-dose implantation with 3d-ions results in the formation of cobalt and nickel metal nanoparticles in the irradiated subsurface layer of the SiO2 matrix. Co and Ni nanocrystals with hexagonal close packing and face-centered cubic structures have a spherical shape and the sizes of 4-5 nm (for cobalt) and 6-14 nm (for nickel) in diameter. Room-temperature FMR signals from ensembles of Co and Ni nanoparticles implanted in the SiO2 matrix exhibit an out-of-plane uniaxial magnetic anisotropy that is typical for thin magnetic films. The dose and temperature dependences of FMR spectra have been analyzed using the Kittel formalism, and the effective magnetization and g-factor values have been obtained for Co- and Ni-implanted samples. Nonsymmetric FMR line shapes have been fitted by a sum of two symmetrical curves. The dependences of the magnetic parameters of each curve on the implantation dose and temperature are presented.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Zavoisky Physical-Technical Institute,Russian Academy of Sciences

Доп.точки доступа:
Edelman, I. S.; Эдельман, Ирина Самсоновна; Petrakovskaja, E. A.; Петраковская, Элеонора Анатольевна; Petrov, D. A.; Петров, Дмитрий Анатольевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Khaibullin, R. I.; Nuzhdin, V. I.; Stepanov, A. L.
}
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16.

Observation of a Chirality-Induced Exchange-Bias Effect / K. Chen [et al.] // Phys. Rev. Appl. - 2019. - Vol. 12, Is. 2. - Ст. 024047, DOI 10.1103/PhysRevApplied.12.024047. - Cited References: 68. - K.C. benefited from the support of the Deusche Forschungsgemeinschaft (DFG) via Project No. 615811. A.P.-K. gratefully acknowledges support from the DFG via Sonderforschungsbereich (collaborative research center) SFB925 (subproject B3). . - ISSN 2331-7019

РУБ Physics, Applied
Рубрики:
SPIN-ORBIT TORQUE
   FIELD
   ANISOTROPY
   MAGNETISM
Аннотация: Chiral magnetism that manifests in the existence of skyrmions or chiral domain walls offers an alternative way for creating anisotropies in magnetic materials that might have large potential for application in future spintronic devices. Here we show experimental evidence for an alternative type of in-plane exchange-bias effect present at room temperature that is created from a chiral 90∘ domain wall at the interface of a ferrimagnetic-ferromagnetic Dy-Co/Ni-Fe bilayer system. The chiral interfacial domain wall forms due to the exchange coupling of Ni-Fe and Dy-Co at the interface and the presence of Dzyaloshinskii-Moriya interaction in the Dy-Co layer. As a consequence of the preferred chirality of the interfacial domain wall, the sign of the exchange-bias effect can be reversed by changing the perpendicular orientation of the Dy-Co magnetization. The chirality-created tunable exchange bias in Dy-Co/Ni-Fe is very robust against high in-plane magnetic fields (μ0H≤6T) and does not show any aging effects. Therefore, it overcomes the limitations of conventional exchange-bias systems.

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Держатели документа:
Helmholtz Zentrum Berlin Mat & Energie, Albert Einstein Str 15, D-12489 Berlin, Germany.
Deutsch Elektronen Synchrotron DESY, Notkestr 85, D-22607 Hamburg, Germany.
Oak Ridge Natl Lab, Neutron Scattering Div, Neutron Sci Directorate, Oak Ridge, TN 37831 USA.
Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden.
European Synchrotron Radiat Facil, Swiss Norwegian Beamlines, F-38043 Grenoble, France.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
RAS, SB, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Helmholtz Zentrum Geesthacht, Inst Mat Res, Max Planck Str 1, D-21502 Geesthacht, Germany.

Доп.точки доступа:
Chen, K.; Philippi-Kobs, A.; Lauter, V.; Vorobiev, A.; Dyadkina, E.; Yakovchuk, V. Yu.; Stolyar, S. V.; Столяр, Сергей Викторович; Lott, D.; Deusche Forschungsgemeinschaft (DFG)German Research Foundation (DFG) [615811]; DFG via Sonderforschungsbereich (collaborative research center)German Research Foundation (DFG) [SFB925]
}
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17.

    Electron Paramagnetic Resonance of Cr3+ Ions in ABO(3) (A = Sc, In, Ga) Diamagnetic Crystals / A. M. Vorotynov [et al.] // J. Exp. Theor. Phys. - 2018. - Vol. 127, Is. 6. - P. 1067-1073, DOI 10.1134/S1063776118120245. - Cited References: 14 . - ISSN 1063-7761. - ISSN 1090-6509
Рубрики:
SPIN-RESONANCE
   PAIRS
   ANISOTROPY
   VBO3
Аннотация: A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic compounds ABO3 (A = Sc, In, and Ga) with small additions of Cr3+ ions (S = 3/2) sufficient to observe single-ion and pair spectra. It is shown that the resonance spectra for isolated Cr3+ ions can be described to a good accuracy by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of the spin Hamiltonian are determined for single Cr3+ ion and Cr3+–Cr3+ pair. Lattice distorsions of the parent ABO3 crystals caused by the Cr3+ impurities is discussed.

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Публикация на русском языке Электронный парамагнитный резонанс ионов Cr3+ в диамагнитных кристаллах ABO3 (A = Sc, In, Ga) [Текст] / А. М. Воротынов [и др.] // Журн. эксперим. и теор. физ. - 2018. - Т. 154 Вып. 6. - С. 1160-1167

Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Fed Res Ctr, Krasnoyarsk Sci Ctr,Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Vorotynov, A. M.; Воротынов, Александр Михайлович; Rudenko, V. V.; Руденко, Валерий Васильевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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18.

    Ferromagnetic resonance study of biogenic ferrihydrite nanoparticles: spin-glass state of surface spins / S. V. Stolyar, D. A. Balaev, V. P. Ladygina [et al.] // JETP Letters. - 2020. - Vol. 111, Is. 3. - P. 183-187, DOI 10.1134/S0021364020030145. - Cited References: 41. - This work was supported by the Russian Foundation for Basic Research, project no. 18-02-40137.This work was supported by the Russian Foundation for Basic Research, by the Government of Krasnoyarsk krai, by the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 19-42-240012 r_a “Magnetic Resonance in Ferrihydrite Nanoparticles: Effects Associated with the Core-Shell Structure”), and by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1263.2020.3). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
MAGNETIC-PROPERTIES
   NIO NANOPARTICLES
   TRANSITION
   ANISOTROPY
Аннотация: Ferrihydrite nanoparticles (2–3 nm in size), which are products of the vital activity of microorganisms, are studied by the ferromagnetic resonance method. The “core” of ferrihydrite particles is ordered antiferromagnetically, and the presence of defects leads to the appearance of an uncompensated magnetic moment in nanoparticles and the characteristic superparamagnetic behavior. It is established from the ferromagnetic resonance data that the field dependence of the frequency is described by the expression 2πν/γ = HR + H A(T=0) (1 − T/T*), where γ is the gyromagnetic ratio, HR is the resonance field, HA ≈ 7 kOe, and T* ≈ 50 K. The induced anisotropy HA is due to the spin-glass state of the near-surface regions.

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Публикация на русском языке Исследование наночастиц биогенного ферригидрита методом ферромагнитного резонанса: спин-стекольное состояние поверхностных спинов [Текст] / С. В. Столяр, Д. А. Балаев, В. П. Ладыгина [и др.] // Письма в ЖЭТФ. - 2020. - Т. 111 Вып. 3. - С. 197-202

Держатели документа:
Russian Acad Sci, Fed Res Ctr KSC, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Fed Res Ctr KSC, Siberian Branch, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Stolyar, S. V.; Столяр, Сергей Викторович; Balaev, D. A.; Балаев, Дмитрий Александрович; Ladygina, V. P.; Pankrats, A. I.; Панкрац, Анатолий Иванович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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19.

    Dielectric and magnetic anomalies in α-MnS single crystals at applied magnetic fIelds / G. Abramova, A. Freydman, E. Eremin [et al.] // J. Supercond. Nov. Magn. - 2022. - Vol. 35, Is. 1. - P. 277-281, DOI 10.1007/s10948-021-06045-z. - Cited References: 22 . - ISSN 1557-1939. - ISSN 1557-1947
   Перевод заглавия: Диэлектрические и магнитные аномалии в монокристалле α-MnS в магнитных полях

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
MAGNETOSTRICTION
ANISOTROPY
Кл.слова (ненормированные):
Correlated electron systems -- Magnetic fields -- Magnetic and dielectric properties -- Sulfide of 3d-elements
Аннотация: Temperature and magnetic field dependences of the magnetic susceptibility and dielectric permittivity of the α-MnS single crystal with NaCl structure are first investigated at around Neel temperature and at 4.2 K and H up to 70 kOe. A relation between the investigated properties was established. The founded phenomena can be due to the magnetostriction or magnetoelastic mechanism and the spin-dependent dipole moment.

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

Доп.точки доступа:
Abramova, G. M.; Абрамова, Галина Михайловна; Freydman, A. L.; Фрейдман, Александр Леонидович; Eremin, E. V.; Еремин, Евгений Владимирович; Pogoreltcev, E. I.; Погорельцев, Евгений Ильич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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20.

Solovev, P. N.
Numerical study of structural and magnetic properties of thin films obliquely deposited on rippled substrates / P. N. Solovev, A. V. Izotov, B. A. Belyaev // J. Phys.: Condens. Matter. - 2021. - Vol. 33, Is. 49. - Ст. 495802, DOI 10.1088/1361-648X/ac26fc. - Cited References: 35. - The reported study was funded by RFBR, the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund and JSC 'NPP Radiosviaz', Project Number 20-42-242901 . - ISSN 0953-8984. - ISSN 1361-648X

РУБ Physics, Condensed Matter
Рубрики:
SIMULATION
ANISOTROPY
GROWTH
Кл.слова (ненормированные):
oblique deposition -- micromagnetic simulation -- thin film growth simulation -- rippled substrate -- magnetic anisotropy -- magnetization reversal
Аннотация: Structural modulation in thin films plays a substantial role in the formation of their magnetic properties. By producing topographic patterns in thin films, it is possible to engineer their magnetic response. Here, we report on the numerical study of the relationship between structural and static magnetic properties of thin films obliquely deposited on substrates with the sinusoidal surface. 3D Monte Carlo film growth simulations show that, under certain deposition conditions, an inhomogeneous columnar morphology can form in the films caused by the shadowing effect and the rippled substrate. Calculations of the demagnetizing tensors for these films demonstrate that their columnar structure is the source of the shape-induced uniaxial magnetic anisotropy that varies nonmonotonically with the deposition angle. Micromagnetic simulations of the generated films confirm the uniaxial character of the shape-induced anisotropy, and also show that magnetization reversal occurs via an incoherent rotation of magnetic moments.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Izotov, A. V.; Изотов, Андрей Викторович; Belyaev, B. A.; Беляев, Борис Афанасьевич; Соловьев, Платон Николаевич; RFBRRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund; JSC 'NPP Radiosviaz' [20-42-242901]
}
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