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Martynov, S. N.
Partially disordered state in the frustrated heisenberg ferrimagnet / S. N. Martynov // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism. [[b]]EASTMAG – 2013[[/b]] : abstracts. - Vladivostok : FEFU, 2013. - P117 . - ISBN 978-5-7444-3124-2

Доп.точки доступа:
Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
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Martynov, S. N.
Incommensurate structures in a two-subsystem partially frustrated ferrimagnet / S. N. Martynov // JETP Letters. - 2012. - Vol. 95, Is. 4. - P. 188-192, DOI 10.1134/S0021364012040066. - Cited References: 23. - This work was supported by the Russian Foundation for Basic Research (project no. 10-02-00765). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
CLASSICAL-THEORY
   MAGNETIC-FIELD
   ANTIFERROMAGNET
   CUB2O4
   STATE
Аннотация: A new incommensurate magnetic structure with a locally triangular orientation of spins has been proposed for a two-subsystem magnet with frustrated intersystem exchange and competition between exchanges in one of the subsystems. When the temperature is lowered, this structure appears from the antiferromagnetic state after a first-order phase transition. It transfers to the Yafet-Kittel triangular structure when the threshold conditions for the exchange interactions are fulfilled. An increase in the length of the frustrated exchange bonds leads to the appearance of an incommensurate phase with the local antiferromagnetic orientation of the sublattices in each subsystem between the commensurate antiferromagnetic and Yafet-Kittel phases.

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Публикация на русском языке Мартынов, Сергей Николаевич. Несоизмеримые структуры в двухподсистемном частично фрустрированном ферримагнетике [Текст] / С. Н. Мартынов // Письма в Журн. эксперим. и теор. физ. : Санкт-Петербургская издательская фирма "Наука" РАН, 2012. - Т. 95 Вып. 4. - С. 205-209

Доп.точки доступа:
Мартынов, Сергей Николаевич
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Martynov, S. N.
Partially disordered state in the frustrated Heisenberg ferrimagnet / S. N. Martynov // Solid State Phenom. : Selected, peer reviewed papers. - 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P. 55-60, DOI 10.4028/www.scientific.net/SSP.215.55. - Cited References: 9 . - ISSN 978-30383. - ISSN 1662-9779
Кл.слова (ненормированные):
Ferrimagnet -- Frustration -- Partially disordered state -- Phase transitions
Аннотация: A model for the description of two-subsystem Heisenberg ferrimagnet with frustrated intersubsystem exchange and competition between exchange interactions in a subsystem is proposed. The conditions of the existence of noncollinear Yafet-Kittel state and partially ordered magnetic structure are investigated. The phase diagram of competition parameter vs temperature is obtained in the mean field approximation. The peculiarities of the succesive magnetic phase transitions are considered. © (2014) Trans Tech Publications, Switzerland.

Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Мартынов, Сергей Николаевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
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Martynov, S. N.
Symmetrical conical incommensurate structures of a frustrated isotropic Heisenberg ferrimagnet / S. N. Martynov // JETP Letters. - 2015. - Vol. 102, Is. 2. - P. 100-104, DOI 10.1134/S0021364015140076. - Cited References:16 . - ISSN 0021. - ISSN 1090-6487. -

РУБ Physics, Multidisciplinary
Рубрики:
CLASSICAL-THEORY
SPIN
MULTIFERROICS
Аннотация: The conditions of the appearance of conical incommensurate structures have been studied analytically for a ferrimagnet with the geometrically frustrated exchange between spins in different magnetic positions (subsystems) and the competition between exchanges in one of the subsystems. The phase transition temperatures to the conical states have been determined. The types of phase transitions have been determined by the numerical minimization of the free energy and (temperature-exchange parameters) phase diagrams have been obtained.

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Публикация на русском языке Мартынов, Сергей Николаевич. Симметричные конические несоизмеримые структуры фрустрированного изотропного гейзенберговского ферримагнетика [Текст] / С. Н. Мартынов // Письма в Журн. эксперим. и теор. физ. : Наука, 2015. - Т. 102 Вып. 2. - С. 111-116

Доп.точки доступа:
Мартынов, Сергей Николаевич
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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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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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Crossover from S-I-S to S-F-S junctions in composites Y3/4Lu1/4Ba2Cu3O7+Y-3(Al1-xFex)(5)O-12 / S. I. Popkov [et al.] // Physica C. - 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P. 1311-1312, DOI 10.1016/j.physc.2007.03.348. - Cited References: 4 . - ISSN 0921-4534

РУБ Physics, Applied

Кл.слова (ненормированные):
S-F-S structures -- high-T-C superconductors -- High-TC superconductors -- S-F-S structures -- Ferrimagnetic materials -- Garnets -- Josephson junction devices -- Magnetization -- Transport properties -- Yttrium alloys -- Critical concentration -- Ferrimagnet junctions -- Magneto-active ions -- Super current carriers -- High temperature superconductors
Аннотация: The transport properties of the two phases composites based on Y3/4Lu1/4Ba2Cu3O7 (YBCO) and Y-3(Al1-xFex)(5)O-12 (X = 0-0... 1.0) have been studied to investigate the effect of magnetic ordering in garnet on superconducting properties of the composites. The composites represent network of Josephson junctions where the non-superconducting ingredient (garnet) acts as barriers separating YBCO grains. It is found that magneto-active ions (Fe) in garnet are responsible for an additional suppression of Josephson coupling in the composites. At some critical concentration of Fe atoms full suppression of super current is observed in a temperature range from T-C of YBCO grains down to the characteristic temperature T,,,. This behavior is attributed to the interaction of super current carriers with spins of Fe atoms located in the barriers. The crossover from S-I-S (S-superconductor, I-insulator) to S-F-S (F-ferrimagnet) junctions is observed in the compdsites Y3/4Lu1/4Ba2Cu3O7 + Y-3(Al1-xFex)(5)O-12 with x increase. (c) 2007 Elsevier B.V. All rights reserved.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Intitute of Physics, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Popkov, S. I.; Попков, Сергей Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Shaihutdinov, K. A.; Petrov, M. I.; Петров, Михаил Иванович
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Transport and magnetic properties of Y3/4Lu1/4Ba2Cu3O7+Y3Fe5O12 composites representing a Josephson-type superconductor-ferrimagnet-superconductor weak-link network / K. A. Shaikhutdinov [et al.] // Phys. Solid State. - 2003. - Vol. 45, Is. 10. - P. 1866-1873, DOI 10.1134/1.1620087. - Cited References: 36 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
RESISTIVE PROPERTIES
   JUNCTION NETWORK
   SYSTEM
   TRANSITION
   CURRENTS
   VOLTAGE
   STATE
   FIELD
Аннотация: Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 composites with different volume ratios of the starting components were synthesized. The composites model an S-F-S Josephson junction network, where S stands for a superconductor and F, for a ferrimagnet. A study of the transport characteristics of the composites revealed that the temperature behavior of the electrical resistivity rho(T) below the superconducting transition point T-C is different in two regions separated by a temperature T-m. Below T-m, the current-voltage characteristics of the composites are nonlinear, while in the interval from T-C to T-m the values of rho(T) do not depend on the transport current j and magnetic field H. This behavior of rho(T, j ) and rho(T, H) is assigned to specific features of the tunneling of superconducting carriers through the ferrimagnetic layers separating HTSC grains in the composite. Magnetic measurements showed the diamagnetic response of HTSC grains to be lower in composites with a ferrimagnet. (C) 2003 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович
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Investigation of the Josephson coupling through a magnetoactive barrier (ferrimagnet, paramagnet) in Y3/4Lu1/4Ba2Cu3O7+Y-3(Al1-xFex)(5)O-12 composites / D. A. Balaev [et al.] // Phys. Solid State. - 2006. - Vol. 48, Is. 11. - P. 2046-2055, DOI 10.1134/S1063783406110023. - Cited References: 41 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
S-F-S
   MAGNETIC-PROPERTIES
   RESISTIVE PROPERTIES
   JUNCTION NETWORK
   SUPERCONDUCTOR
   Y3FE5-XALXO12
   TRANSITION
   TRANSPORT
   METAL
   FIELD
Аннотация: The transport properties of two-phase composites consisting of a high-temperature superconductor and a nonsuperconducting component with magnetic ordering are analyzed. These composites are considered as a network of "superconductor-magnetoactive insulator-superconductor" weak links of the Josephson type. Substituted garnets Y-3(Al1 - x Fe (x) )(5)O-12 (x = 0, ..., 1.0) are used as a magnetoactive component. The composites under investigation contain 92.5 vol % Y3/4Lu1/4Ba2Cu3O7 (the high-temperature superconductor) and 7.5 vol % Y-3(Al1 - x Fe (x) )(5)O-12 (x = 0, ..., 1.0). It is shown that an increase in the iron content in the Y-3(Al1 - x Fe (x) )(5)O-12 garnet leads to a reduction of the Josephson coupling strength: the temperature range in which the electrical resistance of the composites is equal to zero is reduced, and the critical current density at a temperature of 4.2 K decreases exponentially. For composites in which the iron content in the Y-3(Al1 - x Fe (x) )(5)O-12 garnet is higher than 0.1, the temperature dependence of the electrical resistance R(T) at temperatures below the transition point T-C of high-temperature superconductor crystallites has a portion in the range T-m -T-C where the resistance R(T) is independent of the transport current and the magnetic field strength. Below the temperature T-m , the dependences of the electrical resistance R(T) of the composites are nonlinear functions of the current and involve a considerable contribution from magnetoresistance. This behavior is characteristic of a network of Josephson junctions. The temperature T-m decreases with an increase in the iron content in the Y-3(Al1 - x Fe (x) )(5)O-12 garnet. The appearance of the above feature in the temperature dependences of the electrical resistance R(T) is interpreted as complete suppression of the Josephson coupling in the temperature range above T (m) due to the interaction of supercurrent carrier pairs with magnetic moments of iron atoms in the dielectric barriers separating high-temperature superconductor grains.

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Popkov, S. I.; Попков, Сергей Иванович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Petrov, M. I.; Петров, Михаил Иванович
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10.

GROUND-STATE OF EASY-AXIS FERRIMAGNET IN ARBITRARILY ORIENTED MAGNETIC-FIELD NEAR THE COMPENSATION TEMPERATURE / M. S. ERUKHIMOV [и др.] // Fiz. Tverd. Tela. - 1988. - Vol. 30, Is. 4. - P. 1009-1014. - Cited References: 17 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

WOS
Доп.точки доступа:
ERUKHIMOV, M. S.; POPOV, G. V.; SEREDKIN, V. A.; FROLOV, G. I.; KHOLZHIGITOV, S. F.; YAKOVCHUK, V. Y.
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11.

Ordered and disordered magnetic phases coexistence in the quasi-low-dimensional oxyborate Cu2MnBO5 / E. M. Moshkina [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. O3.3. - P. 180. - References: 1 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
ferrimagnet -- magnetic structure -- magnetic susceptibility

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Ritter, C.; Eremin, E. V.; Еремин, Евгений Владимирович; Seryotkin, Yu. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; 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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12.

Martynov, S. N.
Continual approach at T=0 in the mean field theory of incommensurate magnetic states in the frustrated Heisenberg ferromagnet with an easy axis anisotropy / S. N. Martynov, V. I. Tugarinov, A. S. Martynov // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 47-49, DOI 10.1016/j.jmmm.2016.12.086. - Cited References:9 . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
FERRIMAGNET
Кл.слова (ненормированные):
Incommensurate magnetic structures -- Soliton lattice -- Continual approach
Аннотация: The algorithm of approximate solution was developed for the differential equation describing the anharmonical change of the spin orientation angle in the model of ferromagnet with the exchange competition between nearest and next nearest magnetic neighbors and the easy axis exchange anisotropy. The equation was obtained from the collinearity constraint on the discrete lattice. In the low anharmonicity approximation the equation is resulted to an autonomous form and is integrated in quadratures. The obvious dependence of the angle velocity and second derivative of angle from angle and initial condition was derived by expanding the first integral of the equation in the Taylor series in vicinity of initial condition. The ground state of the soliton solutions was calculated by a numerical minimization of the energy integral. The evaluation of the used approximation was made for a triple point of the phase diagram.

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Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Martynov, A. S.; Мартынов, Александр Сергеевич; Мартынов, Сергей Николаевич; 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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13.

Martynov, S. N.
Phase diagram of the ground state of a classical anisotropic frustrated ferromagnet / S. N. Martynov, V. I. Tugarinov // JETP Letters. - 2017. - Vol. 106, Is. 1. - P. 30-34, DOI 10.1134/S0021364017130124. - Cited References:25 . - ISSN 0021-3640. - ISSN 1090-6487

РУБ Physics, Multidisciplinary
Рубрики:
COMPETING INTERACTIONS
HEISENBERG FERRIMAGNET
CHAIN
Аннотация: The phase diagram of the ground state is obtained for the one-dimensional easy-axis model of classical spins coupled by ferromagnetic and antiferromagnetic exchanges between nearest and next-nearest neighbors, respectively. The parameters of the incommensurate magnetic structure with a variable step (soliton lattice) are calculated in the mean field approximation from the condition of the collinearity of spins to the effective exchange fields in the continuous approximation. The ground state of the soliton lattice and interfaces between soliton and collinear (ferromagnetic and "up-up-down-down") phases are determined by the numerical minimization of the average energy over the initial angular velocity of spins.

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Публикация на русском языке Мартынов, Сергей Николаевич. Фазовая диаграмма основного состояния классического анизотропного фрустрированного гейзенберговского ферромагнетика [Текст] / С. Н. Мартынов, В. И. Тугаринов // Письма в ЖЭТФ : Наука, 2017. - Т. 106 Вып. 1. - С. 34-38

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

Доп.точки доступа:
Tugarinov, V. I.; Тугаринов, Василий Иванович; Мартынов, Сергей Николаевич
}
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14.

    Martynov, S. N.
    Single-ion mechanism of weak ferromagnetism and a spin-flop transition in one- and two-position antiferromagnets / S. N. Martynov // JETP Letters. - 2018. - Vol. 108, Is. 3. - P. 196-200, DOI 10.1134/S0021364018150080. - Cited References: 10. - I am grateful to A.D. Balaev, V.I. Zinenko, and A.I. Pankrats for stimulating discussions. This work was supported by the Russian Foundation for Basic Research (project no. 16-02-00563). . - ISSN 0021-3640. - ISSN 1090-6487
Рубрики:
HEISENBERG FERRIMAGNET
   PB2FE2GE2O9
   CRYSTALS
Аннотация: A system of equations describing the ground state in an external magnetic field has been obtained for a twoposition antiferromagnet with noncollinear axes of single-ion anisotropy of moments of different sublattices. It has been shown that the antiferromagnetism vector changes sign at a spin-flop transition. This leads to a first-order magnetic phase transition with hysteresis in the field dependence of the magnetization. Explicit relations have been obtained between the parameters of a microscopic Hamiltonian and the experimentally observed spontaneous moment and spin-flop transition field. It has been shown that the field dependence of the total magnetic moment of the antiferromagnet with magnetic ions at two crystallographically nonequivalent positions (two-position antiferromagnet) obtained within the two-sublattice model is nonlinear above the transition field at any orientation of the crystal with respect to the magnetic field.

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Публикация на русском языке Мартынов, Сергей Николаевич. Одноионный механизм слабого ферромагнетизма и спин-флоп переход в одно- и двухпозиционном антиферромагнетике [Текст] / С. Н. Мартынов // Письма в ЖЭТФ. - 2018. - Т. 108 Вып. 3. - С. 196-200

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

Доп.точки доступа:
Мартынов, Сергей Николаевич; Russian Foundation for Basic Research [16-02-00563]
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15.

    Раствор-расплавный синтез и структурные свойства твердых растворов Mn2-xMgxBO4 / С. Н. Софронова [и др.] // Фундамент. пробл. совр. материаловед. - 2019. - Т. 16, № 1. - С. 36-40, DOI 10.25712/ASTU.1811-1416.2019.01.005. - Библиогр.: 13. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда науки в рамках научного проекта № 18-42-243007. . - ISSN 1811-1416
   Перевод заглавия: Flux Technique and Structural Properties of Solid Solutions Mn2-xMgxBO4
Кл.слова (ненормированные):
варвикиты -- структура -- твердые растворы -- антиферромагнетики -- ферромагнетики -- warwickites -- structure -- solid solution -- antiferromagnet -- ferrimagnet
Аннотация: Исследуемые в данной работе твердые растворы со структурой варвикита представляют значительный интерес с фундаментальной точки зрения, поскольку данные объекты относятся к квази-низкоразмерным магнетикам. В структуре варвикита четыре октаэдра, объединяясь общими гранями, формируют ряд, ряды объединяются в ленты, распространяющиеся вдоль короткой оси. Общая формула соединений со структурой варвикита M2+M3+BO4. В структуре варвикита разновалентные металлические ионы занимают две кристаллографически неэквивалентные октаэдрические позиции 4е: М1 и М2. Марганцевый варвикит Mn2BO4 демонстрирует зарядовое упорядочение: позиция М1 занята ионами Mn3+, позиция M2- ионами Mn2+ . Особый интерес представляет система твердых растворов с замещением в двухвалентной подсистеме на немагнитный ион и сохранением ян-теллеровских ионов Mn3+ в трехвалентной подсистеме. С использованием раствор-расплавного синтеза были получены монокристаллы твердых растворов оксиборатов Mn2-xMgxBO4 (x = 0.91, 1.00, 1.10, 1.14, 1.20) со структурой природного минерала варвикита. Структура и параметры решетки полученных образцов были определены с помощью метода порошкового рентгеноструктурного анализа. Сравнение структурных данных полученных образцов и известных составов позволяет предположить, что концентрации магния для всех синтезированных образцов значительно меньше концентраций «по закладке». При увеличении концентрации магния параметры решетки плавно уменьшаются. При максимальных значениях концентрации магния наблюдается изменение угла моноклинности, хотя структура остается в варвикитной фазе. Вероятно, концентрация хс ≈ 0.76 является критической для стабилизации варвикитной фазы, при дальнейшем увеличении концентрации Mg происходит переход на фазу такеучит или людвигит.
Solid solutions with the warwickite structure which investigated in this paper are very interesting object from fundamental point of view, because they belong to a quasi-low dimensional magnetic. There are four octahedra in the warwickite structure which form row. The rows form the ribbon along short axis. The general formula of warwickite is M2+M3+BO4. Multivalent metallic ions sit in two crystallographic positions 4e:M1 and M2. Mn2BO4 warwickite shown the charge ordering: Mn3+ ions sit in M1 position, Mn2+ ions sit in M2 position. The most interesting systems are solid solutions where divalent ions are replaced by nonmagnetic ions, but the Jahn-Teller Mn3+ ions stay in solid solutions. Solid solutions of oxyborates Mn2-xMgxBO4 (x = 0.91, 1.00, 1.10, 1.14, 1.20) with the warwickite structure were grown using the flux technique. The structure and lattice parameters were studied by the powder X-ray diffraction analysis. Comparison of the structural data of the obtained and known samples implies that the magnesium concentration of all the obtained samples is lower than the magnesium concentration in the flux. When the magnesium concentration increases the lattice parameters decrease slowly. The monoclinic angle changes at the maxima of the magnesium concentration, but the structure still is in wsrwickite phase. The concentration хс ≈ 0.76 is assumed to be critical for stabilizing the warwickite phase. When the magnesium concentration increases, the structure transforms into other phases: takeuchite or ludwigite.

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Держатели документа:
Институт физики им. Л.В. Киренского, Федеральный исследовательский центр КНЦ СО РАН
Институт химии и химической технологии, Федеральный исследовательский центр КНЦ СО РАН
Сибирский государственный университет науки и технологий им. М. Ф. Решетнева

Доп.точки доступа:
Софронова, Светлана Николаевна; Sofronova, S. N.; Мошкина, Евгения Михайловна; Moshkina, E. M.; Казак, Наталья Валерьевна; Kazak, N. V.; Бельская, Надежда Алексеевна; Bel'skaya N.A.; Соловьев, Леонид Александрович; Soloviev L.A.; Безматерных, Леонард Николаевич; Bezmaternykh, L. N.
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16.

Exchange coupling in DyxCo1-x/Bi/NiFe ferrimagnet spin valve / V. A. Komarov [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. A.P33. - P. 134. - Cited References: 2 . - 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
Achinsk branch of Krasnoyarsk State Agrarian University, Achinsk, 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; Komarov, V. A.; Yakovchuk, V. Yu.; Яковчук, Виктор Юрьевич; Volchenko, E. N.; Zhivaya, Ya. A.; Patrin, G. S.; Патрин, Геннадий Семёнович; Kosyrev, N. N.; Косырев, Николай Николаевич; 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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17.

Co5/3Nb1/3BO4: A new cobalt oxyborate with a complex magnetic structure / N. V. Kazak, N. A. Belskaya, E. M. Moshkina [et al.] // J. Magn. Magn. Mater. - 2021. - Vol. 534. - Ст. 168056, DOI 10.1016/j.jmmm.2021.168056. - Cited References: 50. - The authors acknowledge M. Molokeev for the orientating the single crystal for magnetic measurements. The X-ray diffraction and specific heat measurements were carried out in the Common Access Facility Centres of SB RAS (Krasnoyarsk, Russia) and P.N. Lebedev Physical Institute of RAS (Moscow, Russia). This work has been financed by the Russian Foundation for Basic Research (project no. 20-02-00559). We acknowledge financial support from the Spanish MINECO DWARFS project MAT2017-83468-R and Gobierno de Aragón (Group, E12-20R) . - ISSN 0304-8853
Кл.слова (ненормированные):
Warwickites -- Ferrimagnet
Аннотация: Needle-shape single crystals of Co5/3Nb1/3BO4 warwickite were grown using the flux technique. X-ray diffraction measurements have revealed an orthorhombic structure (Sp. Gr. Pbnm) where the octahedral M1 site is occupied by a mixture of Co2+/Nb5+ ions and the M2 site is exclusively filled by Co2+ ions. Using dc magnetization measurements it was established that the new material undergoes two magnetic transitions: an antiferromagnetic transition at TN1 = 27 K and a ferrimagnetic one at TN2 = 14 K, below which a hysteresis cycle opens. Both magnetic transitions are marked by anomalies in the specific heat. High magnetic anisotropy with c-axis as a hard magnetization direction was detected.

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Держатели документа:
Kirensky Institute of Physics, FRC SB RAS, Krasnoyarsk, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza and Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Zaragoza, Spain
P.N. Lebedev, Physical Institute of RAS, Moscow, 119991, Russian Federation

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Belskaya, N. A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Bartolome, J.; Arauzo, A.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Gavrilkin, S. Y.; Gorev, M. V.; Горев, Михаил Васильевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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18.

    Influence of Jahn-Teller Cu2+ doping on the structural and magnetic properties of quasi-two-dimensional oxyborate (Ni,Cu)2MnBO5 / A. Kartashev, E. Eremin, E. Moshkina [et al.] // J. Magn. Magn. Mater. - 2022. - Vol. 545. - Ст. 168747, DOI 10.1016/j.jmmm.2021.168747. - Cited References: 23. - This study was carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Science Center, Siberian Branch of the Russian Academy of Sciences. This work was supported by the Russian Foundation for Basic Research, Government of the Krasnoyarsk Region, and Krasnoyarsk Regional Foundation for Support of Scientific and R&D Activities, project no. 20-42-240011 . - ISSN 0304-8853
   Перевод заглавия: Влияние ян-теллеровского легирования Cu2+ на структурные и магнитные свойства квазидвумерного оксибората (Ni,Cu)2MnBO5
Кл.слова (ненормированные):
Ferrimagnet -- Frustrated materials -- Low-dimensional system -- Ludwigites
Аннотация: Using the flux technique single crystals of (Ni,Cu)2MnBO5 were grown. The crystal structure of this compound belongs to the space group Pbam(55). There are no monoclinic distortions of the crystal structure. The analysis of the structural data shows that the content of copper ions in the crystal is lower than 10 percent. The magnetic ordering into the ferrimagnetic phase occurs at 75 K. The assessment of the exchange interactions shows that changes in the exchange interactions lead to increasing frustrations in the system which could result in a decrease in the temperature of magnetic ordering.

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Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Kartashev, A. V.; Карташев, Андрей Васильевич; Eremin, E. V.; Еремин, Евгений Владимирович; Moshkina, E. M.; Мошкина, Евгения Михайловна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sofronova, S. N.; Софронова, Светлана Николаевна
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19.

Begunovich, L. V.
Magnetic collapse in Fe3Se4 under high pressure / L. V. Begunovich, M. M. Korshunov, S. G. Ovchinnikov // Materials. - 2022. - Vol. 15, Is. 13. - Ст. 4583, DOI 10.3390/ma15134583. - Cited References: 27. - L.V.B. and S.G.O. acknowledge the support of the Russian Science Foundation (Project 18-12-00022Π). We acknowledge the useful discussions with M.A. Vysotin. L.V.B. would like to thank the Information Technology Center, Novosibirsk State University, for providing access to their supercomputer facilities . - ISSN 1996-1944
Кл.слова (ненормированные):
band structure -- magnetic moment -- DFT -- pressure -- ferrimagnet -- ferromagnet -- iron selenide
Аннотация: Electronic structure and magnetic properties of Fe3Se4 are calculated using the density functional approach. Due to the metallic properties, magnetic moments of the iron atoms in two nonequivalent positions in the unit cell are different from ionic values for Fe3+ and Fe2+ and are equal to M1=2.071μB and M2=−2.042μB, making the system ferrimagnetic. The total magnetic moment for the unit cell is 2.135μB. Under isotropic compression, the total magnetic moment decreases non-monotonically and correlates with the non-monotonic dependence of the density of states at the Fermi level N(EF). For 7% compression, the magnetic order changes from the ferrimagnetic to the ferromagnetic. At 14% compression, the magnetic order disappears and the total magnetic moment becomes zero, leaving the system in a paramagnetic state. This compression corresponds to the pressure of 114 GPa. The magnetic ordering changes faster upon application of an isotropic external pressure due to the sizeable anisotropy of the chemical bondings in Fe3Se4. The ferrimagnetic and paramagnetic states occur under pressures of 5.0 and 8.0 GPa, respectively. The system remains in the metallic state for all values of compression.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodny Prospect 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Бегунович, Людмила Витальевна
}
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20.

Martynov, A. S.
Quantum SU(3)-ferrimagnet on triangular lattice / A. S. Martynov, D. M. Dzebisashvili // J. Magn. Magn. Mater. - 2024. - Vol. 594. - Ст. 171906, DOI 10.1016/j.jmmm.2024.171906. - Cited References: 48. - The authors thanks professor V.V. Val’kov for original idea of this article, for his continuous interest and enormous contribution to this work . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
Quantum SU(3)-ferrimagnet -- Single-ion anisotropy -- Quadrupole ordering -- Triangular lattice
Аннотация: Manifestations of quantum effects in the macroscopic properties of frustrated magnets keep attracting considerable interest. We have formulated and studied a simple model of a three-sublattice mixed-spin (S=1,1/2,1/2) SU(3)-ferrimagnet on triangular lattice in which the strong quantum fluctuations are developed due to combined effect of frustrated exchange bonds, reduced dimensionality and a single-ion easy-plane anisotropy in the spin-1 sublattice. To account correctly for the SU(3) algebra, the Hubbard operators representation of generators is used. Dependencies of the magnetic moments R and RL (for spin-1/2 and spin-1 sublattices respectively), the total magnetic moment M, as well as the quadrupole moment, on the anisotropy parameter D are calculated at zero temperature and different ratios I/J of exchange integrals from different sublattices. It is established that for I/J≪1 the critical value Dc, at which the system enters the quadrupole antiferromagnetic phase, can be much smaller than both I and J. Besides, with an increase in D from zero to Dc the total moment M can change its direction several times via taking zero value. Classification of four branches of the spin-wave excitation spectrum of the SU(3)-ferrimagnet is carried out and modification of the spectrum with change in the single-ion anisotropy is analyzed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Мартынов, Александр Сергеевич
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