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Forming a ferrimagnetic-like structure in the PbMn1−xFexBO4 (x ≈ 0.1) single crystal upon partial substitution / A. Pankrats [et al.] // J. Magn. Magn. Mater. - 2020. - Vol. 497. - Ст. 165997, DOI 10.1016/j.jmmm.2019.165997. - Cited References: 25. - The authors are grateful to S. Nikitin for help in the specific heat measurements in a magnetic field and S. Martynov for fruitful discussions. This study was funded by RFBR and the Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science , to the research project no. 18-42-240008 “Effect of Magnetic Structure on the Magnetodielectric Properties of Oxide Crystals Containing Stereoactive Ions Pb 2+ and Bi 3+”. . - ISSN 0304-8853
Кл.слова (ненормированные):
Crystal structure -- Ferrimagnetism -- Ferromagnetic materials -- Ferromagnetic resonance -- Ferromagnetism -- Iron -- Magnetic anisotropy -- Magnetic moments -- Manganese -- Metal ions -- Single crystals -- Specific heat of solids
Аннотация: The PbMn1−xFexBO4 (x ≈ 0.1) orthoborate single crystals have been grown for the first time by spontaneous crystallization and their magnetic and resonance properties and specific heat have been examined. It has been established that partial substitution of iron ions for manganese ones leads to an increase in the Curie temperature to 34.2 K from its value of 30.3 K in the unsubstituted crystal, enhances the magnetic anisotropy, and reduces the saturation magnetization. The magnetization drop is explained in the framework of the model of a ferrimagnetic-like structure, in which the magnetic moments of iron and manganese ions form ferromagnetic subsystems coupled by the antiferromagnetic exchange. It has been found that under magnetization along the rhombic b axis the magnetic moments switch stepwise to the magnetic field direction in a certain critical field. The spin-reorientation transition is the first-order one. This feature of the crystal magnetization does not allow the experimental ferromagnetic resonance frequency-field dependence for the rhombic b axis to be described using the calculation for a simple rhombic ferromagnet. It has been established that the increase in the magnetic anisotropy of the crystal upon substitution leads to an increase in the energy gap in the ferromagnetic resonance spectrum to 121.5 GHz at T = 4.2 K.

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

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Kolkov, M. I.; Колков, Максим Игоревич; Balaev, A. D.; Балаев, Александр Дмитриевич; Shabanov, A. V.; Шабанов, Александр Васильевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич
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General regularities and differences in the behavior of the dynamic magnetization switching of ferrimagnetic (CoFe2O4) and antiferromagnetic (NiO) nanoparticles / S. I. Popkov, A. A. Krasikov, S. V. Semenov [et al.] // Phys. Solid State. - 2020. - Vol. 62, Is. 9. - P. 1518-1524, DOI 10.1134/S1063783420090255. - Cited References: 46. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk region, and the Krasnoyarsk Regional Foundation for Science, project no. 18-42-240012: "Magnetization switching of magnetic nanoparticles in strong pulsed magnetic fields is a new approach to studying the dynamic effects related to the processes of magnetization of magnetic nanoparticles" . - ISSN 1063-7834. - ISSN 1090-6460

РУБ Physics, Condensed Matter
Рубрики:
PARTICLE-SIZE
   EXCHANGE-BIAS
   TEMPERATURE
   STATE
   COERCIVITY
Кл.слова (ненормированные):
CoFe2O4nanoparticles -- antiferromagnetic NiO nanoparticles -- dynamic magnetization switching -- coercive force
Аннотация: In antiferromagnetic (AFM) nanoparticles, an additional ferromagnetic phase forms and leads to the appearance in AFM nanoparticles of a noncompensated magnetic moment and the magnetic properties typical of common FM nanoparticles. In this work, to reveal the regularities and differences of the dynamic magnetization switching in FM and AFM nanoparticles, the typical representatives of such materials are studied: CoFe2O4 and NiO nanoparticles with average sizes 6 and 8 nm, respectively. The high fields of the irreversible behavior of the magnetizations of these samples determine the necessity of using strong pulsed fields (amplitude to 130 kOe) to eliminate the effect of the partial hysteresis loop when studying the dynamic magnetic hysteresis. For both types of the samples, coercive force HC at the dynamic magnetization switching is markedly higher than HC at quasi-static conditions. HC increases as the pulse duration τP decreases and the maximum applied field H0 increases. The dependence of HC on field variation rate dH/dt = H0/2τP is a unambiguous function for CoFe2O4 nanoparticles, and it is precisely such a behavior is expected from a system of single-domain FM nanoparticles. At the same time, for AFM NiO nanoparticles, the coercive force is no longer an unambiguous function of dH/dt, and the value of applied field H0 influences more substantially. Such a difference in the behaviors of FM and AFM nanoparticles is caused by the interaction of the FM subsystem and the AFM “core” inside AFM nanoparticles. This circumstance should be taken into account when developing the theory of dynamic hysteresis of the AFM nanoparticles and also to take into account their practical application.

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Публикация на русском языке Общие закономерности и различия в поведении динамического перемагничивания ферримагнитных (CoFe2O4) и антиферромагнитных (NiO) наночастиц [Текст] / С. И. Попков, А. А. Красиков, С. В. Семенов [и др.] // Физ. тверд. тела. - 2020. - Т. 62 Вып. 9. - С. 1354-1360

Держатели документа:
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Boreskov Inst Catalisis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Krasikov, A. A.; Красиков, Александр Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Yakushkin, S. S.; Kirillov, V. L.; Mart'yanov, O. N.; Balaev, D. A.; Балаев, Дмитрий Александрович; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk region; Krasnoyarsk Regional Foundation for Science [18-42-240012]
}
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Formation the ferrimagnetic-like structure under partial subtitution in the crystal PbMn1?xFexBO4 (x?0.1) / A. I. Pankrats [et al.] // Euro-asian symposium "Trends in magnetism" (EASTMAG-2019) : Book of abstracts / чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст. B.P2. - P. 167. - Cited References: 2. - The reported study was funded by RFBR and the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project no. 18-42-240008 ”Effect of magnetic structure on the magnetodielectric properties of oxide crystals containing stereoactive ions Pb2+ and Bi3+” . - ISBN 978-5-9500855-7-4

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

Доп.точки доступа:
Ovchinnikov, S. G. \чл. конс. ком.\; Овчинников, Сергей Геннадьевич; Volkov, N. V. \чл. конс. ком.\; Волков, Никита Валентинович; Dzebisashvili, D. M. \чл. прогр. ком.\; Дзебисашвили, Дмитрий Михайлович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Kolkov, M. I.; Колков, Максим Игоревич; Shabanov, A. V.; Шабанов, Александр Васильевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Российская академия наук; Уральское отделение РАН; Институт физики металлов им. М. Н. Михеева Уральского отделения РАН; Уральский федеральный университет им. первого Президента России Б.Н. Ельцина; Российский фонд фундаментальных исследований; Euro-Asian Symposium "Trends in MAGnetism"(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(7 ; 2019 ; Sept. ; 8-13 ; Ekaterinburg)
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    Spin-wave spectroscopy and magnetostructural studies of Co nanogranular composites / E. A. Denisova [et al.] // Acta Phys. Pol. A. - 2018. - Vol. 134: Proceedings of International Symposium on Physics of Materials (ISPMA 14), Is. 3. - P. 623-626, DOI 10.12693/APhysPolA.134.623. - Cited References: 25. - This work was supported by RFBR grants nos. 16-03-00256, 16-03-00969. . - ISSN 0587-4246. - ISSN 1898-794X
   Перевод заглавия: Спин-волновая спектроскопия и магнитоструктурные исследования наногранулированных композитов на основе Со
Рубрики:
Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances
   Spin-wave resonance
   Magnetic anisotropy
Аннотация: Nanogranular Co-SiO2, and Co-CaF2 films are investigated using ferromagnetic resonance and magnetic measurements. The spectrum of standing spin-wave has been registered in the perpendicular experiment configuration for all types of films with the magnetic granules content above 52 vol.%. The dependences of resonance fields Hr of spin modes on the mode number squared Hr(n2) are non-linear. Such behavior is supposed to be the result of the fluctuations of magnetic parameters (the magnetization and the ferromagnetic exchange coupling) in nanocomposite films. A comparison between the magnetic properties of Co-SiO2 granular films and Co-CaF2 films is carried out. The surface anisotropy value Ks of Co-SiO2 films is evaluated from the surface resonance modes of spin-wave resonance spectra as 3.5×10-4s7×10-4 J/m2. The magnetic anisotropy of Co100-x(SiO2)x, Co100-x(CaF2)x films (34s and the surface magnetic anisotropy of films Ks are determined. It is found that surface anisotropy of granules is predominant.

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Держатели документа:
Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Akademgorodok 50, bld. 38, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Voronezh State Technical University, Voronezh, Russian Federation

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Chekanova, L. A.; Чеканова, Лидия Александровна; Kalinin, Yu. E.; Sitnikov, A. V.; International Symposium on Physics of Materials(14 ; 2017 ; Sept. ; 10-15 ; Prague, Czech Republic)
}
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Sofronova, S. N.
Ludwigites: From natural mineral to modern solid solutions / S. Sofronova, I. Nazarenko // Cryst. Res. Technol. - 2017. - Vol. 52, Is. 4. - Ст. 1600338, DOI 10.1002/crat.201600338. - Cited References: 60. - This study was supported by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 17-42-240338. . - ISSN 0232-1300
Кл.слова (ненормированные):
ludwigites -- ferrimagnetic -- antiferromagnetic -- spin-glass -- oxyborates
Аннотация: Ludwigites is a type of oxyborates compounds with BO3 groups, which have low-dimensional elements: stairs, zigzag walls, tapes. Such structural features influence on the physical properties of the compounds and cause charge ordering, the existence of two magnetic subsystems, ordered at different temperatures in the perpendicular direction, the quasi-one-dimensional magnetism, spin-glass state. In this survey, we have summarized all known experimental and theoretical studies and analyzed the proposed by the authors mechanisms of phase transitions in the ludwigite structure oxyborates. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Nazarenko, I. I.; Назаренко, Илья Иванович; Софронова, Светлана Николаевна
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Crystal structure and exchange interactions of Cu2MnBO5 / S. N. Sofronova [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P1.27. - P. 87. - References: 4 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
ludwigites -- exchange interactions -- single crystal -- ferrimagnetic

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Nazarenko, I. I.; Назаренко, Илья Иванович; Veligzhanin, A. A.; Seryotkin, Yu. V.; 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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Nazarenko, I. I.
Ni5GeB2O10 Magnetic Properties Theoretical Study / I. I. Nazarenko, S. Safronova // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. O1.1. - P. 37. - References: 4 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
ludwigites -- magnetic order -- exchange interactions -- ferrimagnetic

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Назаренко, Илья Иванович; 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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    The superexchange interactions and magnetic ordering in low-dimentional ludwigite Ni5GeB2O10 / S. N. Sofronova [et al.] // J. Magn. Magn. Mater. - 2016. - Vol. 401. - P. 217-222, DOI 10.1016/j.jmmm.2015.10.024. - Cited References: 23. - This study was supported by Russian Foundation for Basic Research (RFFI Siberia No. 15-42-04186). We thank S. Popkov, G. Yurkin for help on the magnetic measurements and M.S. Molokeev for help on the x-ray diffraction . - ISSN 0304-8853
   Перевод заглавия: Суперобменные взаимодействия и магнитное упорядочение в низкомерном людвигите Ni5GeB2O10

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
DIELECTRICS
EXCHANGE
CATION
Кл.слова (ненормированные):
Ludwigites -- Magnetic order -- Heat capacity -- Exchange interactions -- Ferrimagnetic
Аннотация: The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial ordering or spin-glass state at 87 K. The superexchange interactions were calculated in the framework of a simple indirect coupling model. Different models of magnetic structure of Ni5Ge(BO5)2 and its unique magnetic behaviour was discussed. © 2015 Elsevier B.V.

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Держатели документа:
L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Science, Krasnoyarsk, Russian Federation
M.V. Reshetnev Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Nazarenko, I. I.; Назаренко, Илья Иванович; Volkov, N. V.; Волков, Никита Валентинович; Kartashev, A. V.; Карташев, Андрей Васильевич; Moshkina, E. M.; Мошкина, Евгения Михайловна
}
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Valence-specific magnetization of the ferrimagnetic oxyborate single crystals using soft and hard X-ray mag-netic circular dichroism under high magnetic fields / S. G. Ovchinnikov [et al.] // 20th Int. Conf. on Magnetism (ICM-2015) : book of abstracts. - 2015. - Ст. TU.H-P31

Материалы конференции

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Platunov, M. S.; Платунов, Михаил Сергеевич; Kazak, N. V.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Rogalev, A.; Wilhelm, F.; Weschke, E.; Весчке И.; Schierle, E.; Счайле И.; Zubavichus, Y. V.; International Conference on Magnetism(20 ; 2015 ; Jul ; 5-10 ; Barselona, Spain)
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10.

Spin-lattice coupling and peculiarities of magnetic behavior of ferrimagnetic ludwigites Mn0.52+M1.52+Mn3+BO5(M=Cu, Ni) / L. N. Bezmaternykh [et al.] // Solid State Phenom. : Selected, peer reviewed papers. - 2015. - Vol. 233-234: Achievements in Magnetism. - P. 133-136, DOI 10.4028/www.scientific.net/SSP.233-234.133. - Cited References: 7 . - ISSN 1662-9779. - ISSN 978-3-038
Рубрики:
Achievements in magnetism
Кл.слова (ненормированные):
counter magnetization -- spin-lattice coupling -- ludwigites
Аннотация: Temperature-field and orientational magnetization dependences of single crystals were measured. Both samples demonstrate significant field-depending temperature hysteresis and low-temperature counter field magnetization. The correlation of orientational dependences of these effects and magnetic anisotropy is analyzed; the role of spin-lattice interactions is discussed.
Измерены температурно-полевые и ориентационные зависимости намагниченности монокристаллов. Оба образца демонстрируют гистерезис температуры в зависимости от поля и существенную намагниченность, направленную против поля при низкой температуре. Анализируется корреляция ориентационных зависимостей этих эффектов и магнитной анизотропии; Обсуждается роль спин-решеточных взаимодействий.

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Доп.точки доступа:
Perov, N. \ed.\; Semisalova, A. \ed.\; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Moshkina, E. M.; Мошкина, Евгения Михайловна; Eremin, E. V.; Еремин, Евгений Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Volkov, N. V.; Волков, Никита Валентинович; Seryotkin, Yu. V.; Moscow International Symposium on Magnetism(6 ; 2014 ; June-July ; Moscow)
}
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