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Magnetization pole reversal of ferrimagnetic ludwigites Mn3-xNixBO5 / L. N. Bezmaternykh [et al.] // J. Magn. Magn. Mater. - 2014. - Vol. 364. - P. 55-59, DOI 10.1016/j.jmmm.2014.04.031. - Cited References: 13. - The study was supported by the Siberian Branch of the Russian Academy of Sciencesintegration Projectnos.29and2.5.2 . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter

Кл.слова (ненормированные):
Crystal growth -- Ferrimagnets -- Magnetization pole reversal
Аннотация: The conditions for the flux growth of new Mn-Ni oxyborates with the ludwigite structure are reported. Magnetic measurement data for the samples with nickel and manganese predominance are presented. Magnetization pole reversal of the ferrimagnetic phases is established and analyzed in the framework of a model comprising two antiferromagnetically interacting subsystems, each being ferrimagnetically ordered. В© 2014 Elsevier B.V.
В статье сообщают об условиях раствор-расплавного роста нового Mn–Ni оксибората со структурой людвигита. Представлены данные об магнитных измерениях для образцов с преобладанием никеля и марганца. Точка изменения знака намагниченности ферримагнитных фаз установлена и проанализирована в рамках модели, включающей две антиферромагнитным образом взаимодействующих подсистемы, каждая из которых является ферримагнитноупорядоченной.

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Доп.точки доступа:
Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Kolesnikova, E. M.; Колесникова, Евгения Михайловна; Eremin, E. V.; Еремин, Евгений Владимирович; Sofronova, S. N.; Софронова, Светлана Николаевна; Volkov, N. V.; Волков, Никита Валентинович; Molokeev, M. S.; Молокеев, Максим Сергеевич
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Martynov, S. N.
Flat and conical incommensurate magnetic structures in the two-subsystem partially frustrated Heisenberg ferrimagnet / S. N. Martynov // J. Magn. Magn. Mater. - 2016. - Vol. 398. - P. 121-126, DOI 10.1016/j.jmmm.2015.09.046. - Cited References: 21 . - ISSN 0304-8853

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
Spin-wave spectrum
   Phase 10 K
   Copper metaborate
   Classical-theory
   State
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Phase transitions -- Ferrimagnets
Аннотация: The phase transitions into flat and conical incommensurate magnetic structures are considered for a ferrimagnet with the dominant nonfrustrated exchange between the spins in one crystallographic position, competing exchanges between the spins in another position and frustrated exchange between the spins in different positions. The appearance conditions and the temperatures of the second order phase transitions are analytically obtained in the mean field approximation. The first order phase transition between these states is studied and the phase diagrams of temperature vs frustrated exchanges are calculated by the numerical minimization of free energy.

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Доп.точки доступа:
Мартынов, Сергей Николаевич
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Berzhanskii, V. N.
Critical relaxation of uniform precession of magnetization in cubic ferrimagnets / V. N. Berzhanskii, V. I. Ivanov // Phys. Status Solidi B. - 1989. - Vol. 151, Is. 1. - P. 259-267, DOI 10.1002/pssb.2221510130. - Cited References: 22 . - ISSN 0370-1972

РУБ Physics, Condensed Matter

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Держатели документа:
LV KIRENSKII PHYS INST,KRASNOYARSK 660036,USSR
ИФ СО РАН
Доп.точки доступа:
Ivanov, V. I.; Бержанский, Владимир Наумович
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Berzhanskii, V. N.
Relaxation of uniform magnetization precession in collinear cubic ferrimagnets in the paramagnetic neighborhood of TC / V. N. Berzhanskii, V. I. Ivanov, A. V. Lazuta // JETP Letters. - 1990. - Vol. 52, Is. 9. - P. 483-487. - Cited References: 10 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
CDCR2SE4
Аннотация: The characteristic features of the critical spin dynamics of the cubic ferrimagnets Y3Fe5O12 and MnFe2O4 in the exchange temperature region above T(c) have been studied. The magnetic-dipole relaxation of the uniform magnetization of these ferrimagnets is shown to be suppressed. The relaxation channel due to the local uniaxial anisotropy, with a new temperature dependence, is the dominant channel.

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Держатели документа:
LV KIRENSKY PHYS INST,KRASNOYARSK,USSR
ИФ СО РАН

Доп.точки доступа:
Ivanov, V. I.; Lazuta, A. V.; Бержанский, Владимир Наумович
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    Magnetic structure of Cu2MnBO5 ludwigite: thermodynamic, magnetic properties and neutron diffraction study / E. Moshkina [et al.] // J. Phys.: Condens. Matter. - 2017. - Vol. 29, Is. 24. - Ст. 245801, DOI 10.1088/1361-648X/aa7020. - Cited References:28. - This study was supported by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028. . - ISSN 0953-8984. - ISSN 1361-648X
   Перевод заглавия: Магнитная структура людвигита Cu2MnBO5: исследование термодинамических, магнитных свойств и с помощью метода нейтронной дифракции

РУБ Physics, Condensed Matter
Рубрики:
HEAT
Кл.слова (ненормированные):
neutron diffraction -- magnetic structure -- ludwigites -- ferrimagnets -- magnetic susceptibility -- specific heat
Аннотация: We report on the thermodynamic, magnetic properties and the magnetic structure of ludwigite-type Cu2MnBO5. The specific heat, low-field magnetization and paramagnetic susceptibility were studied on a single crystal and combined with powder neutron diffraction data. The temperature dependence of the specific heat and the neutron diffraction pattern reveal a single magnetic phase transition at T = 92 K, which corresponds to the magnetic ordering into a ferrimagnetic phase. The cation distribution and the values and directions of magnetic moments of ions in different crystallographic sites are established. The magnetic moments of Cu2+ and Mn3+ ions occupying different magnetic sites in the ferrimagnetic phase are pairwise antiparallel and their directions do not coincide with the directions of the principal crystallographic axes. The small value of the magnetic moment of copper ions occupying site 2a is indicative of partial disordering of the magnetic moments on this site. The magnetization measurements show a strong temperature hysteresis of magnetization, which evidences for field-dependent transitions below the phase transition temperature.

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Держатели документа:
RAS, Kirensky Inst Phys, Fed Res Ctr KSC SB, Krasnoyarsk 660036, Russia.
Siberian State Aerosp Univ, Krasnoyarsk 660037, Russia.
Inst Max von Laue Paul Langevin, BP 156, F-38042 Grenoble 9, France.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Krasnoyarsk State Pedag Univ, Krasnoyarsk 660049, Russia.

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Ritter, Clemens; Eremin, E. V.; Еремин, Евгений Владимирович; Sofronova, S. N.; Софронова, Светлана Николаевна; Kartashev, A. V.; Карташев, Андрей Васильевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Russian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory [16-42-243028]
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    Transformation of structure and magnetic properties of Cu2MnBO5 under partial Mn3+ → Fe3+ substitution / E. M. Moshkina [et al.] // J. Magn. Magn. Mater. - 2018. - Vol. 464. - P. 1-10, DOI 10.1016/j.jmmm.2018.05.021. - Cited References: 25. - This study was supported by Russian Foundation for Basic Research ( RFBR ) and Government of Krasnoyarsk Territory according to the research project No. 16-42-243028. X-ray diffraction experiment was carried out at the Centre on Molecular Design and Ecologically Safe Technologies at the Novosibirsk State University. The work of one of the coauthors (M.S.P.) was supported by the Russian Foundation for Basic Research (project no. 16-32-60049) and by the program of Foundation for promoting the development of small enterprises in scientific and technical sphere (“UMNIK” program). . - ISSN 0304-8853
   Перевод заглавия: Трансформация структуры и магнитных свойств Cu2MnBO5 при частичном замещении Mn3+ → Fe3+
Кл.слова (ненормированные):
Ludwigites -- Crystal growth -- Ferrimagnets -- Quasi-low-dimensional structure -- Magnetic phase transitions
Аннотация: Single crystals of Fe-substituted Cu2Mn1-xFexBO5 ludwigites have been synthesized using flux technique (x = 0.2, 0.4, 0.5 – in the initial flux system). Structural properties of the synthesized compounds were studied by the single crystal and powder X-ray diffraction analysis. Obtained results were analyzed in the relationship with parent compound Cu2MnBO5. It was revealed that the type of monoclinic distortions of Fe-substituted ludwigites is different from the structure of Cu2MnBO5. The real cation composition and local structure of Cu2Mn1-xFexBO5 ludwigites were studied using XANES and EXAFS techniques, respectively. Analysis of field and thermal dependencies of magnetization showed a high dependence of the magnetic properties of these ludwigites on x with changing the type of magnetic ordering.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, Russian Federation
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS, Novosibirsk, Russian Federation
Novosibirsk State University, Novosibirsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Platunov, M. S.; Платунов, Михаил Сергеевич; Seryotkin, Y. V.; Bovina, A. F.; Бовина, Ася Федоровна; Eremin, E. V.; Еремин, Евгений Владимирович; Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
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    Crystal growth, magnetic properties and analysis of possible magnetic ordering of Ni5Sn(BO5)2 with ludwigite structure / S. Sofronova [et al.] // Phys. Status Solidi B. - 2018. - Vol. 255, Is. 12. - Ст. 1800281, DOI 10.1002/pssb.201800281. - Cited References: 15 . - ISSN 0370-1972
   Перевод заглавия: Рост, магнитные свойства и анализ возможных магнитных структур кристалла Ni5Sn(BO5)2 со структурой людвигита
Кл.слова (ненормированные):
ferrimagnets -- ludwigites -- magnetic phase transitions -- quasi-low-dimensional structures
Аннотация: The ludwigite Ni5Sn(BO5)2 belongs to a family of oxyborates, and has an ordered distribution of nonmagnetic Sn ions. This material is studied here using magnetic measurements. Ni5Sn(BO5)2 does not show full long-range magnetic order, but exhibits a partial ordering at 73 K. A theoretical group analysis is performed and different models of the magnetic structure of Ni5Sn(BO5)2 are discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660014, Russian Federation

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Eremin, E. V.; Еремин, Евгений Владимирович; Chernyshov, A.; Bovina, A. F.; Бовина, Ася Федоровна
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