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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Orbital structure and magnetic phase diagram of the four-sublattice ferromagnet PbMnBO4
Место публикации : J. Magn. Magn. Mater. - 2023. - Vol. 570. - Ст.170520. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2023.170520. - ISSN 18734766 (eISSN)
Примечания : Cited References: 20. - The author thanks A.D. Balaev for useful discussions of the magnetic measurements
Аннотация: A role of quadric and quartic single-ion anisotropy (SIA) of Mn3+-ions, dipole–dipole and Dzyaloshinsky–Moriya (DM) interactions for the magnetic ordering of the four-sublattice ferromagnet PbMnBO4 is investigated. A phase diagram of low-lying magnetic phases on the plane of the DM exchange components is obtained for different values of the SIA parameters. An effect of the isotropic interchain exchange on the spin orientation and, as a result, on the SIA energy in different magnetic phases is considered at the comparable values of the interactions. The determinative role of DM exchange for the magnetic anisotropy of PbMnBO4 is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kozak V. V., Fedorova N. A., Olshevskaya Ju. S., Kovaleva A. V., Shubin A. A., Tarasov A. S., Varnakov S. N., Ovchinnikov S. G., Tomilin F. N., Avramov P. V.
Заглавие : Nearly flat bands and ferromagnetism in the terminated Mn2C MXene
Место публикации : Comput. Condens. Matter. - 2023. - Vol. 35. - Ст.e00806. - ISSN 23522143 (eISSN), DOI 10.1016/j.cocom.2023.e00806
Примечания : Cited References: 76. - This study was supported by the Russian Science Foundation, project no. 21-12-00226 and the JCSS Joint Super Computer Center of the Russian Academy of Sciences. P.V.A. acknowledges the National Research Foundation of the Republic of Korea grant NRF 2021R1A2C1010455
Аннотация: Using Density Functional Theory and Periodic Boundary Conditions it is shown that the hydroxylated/oxygenated/halogenated Mn2C monolayer is a 2D ferromagnetic material with a local Mn ions magnetic moment of 2.7μв per unit cell. Upon oxygenation the ferromagnetic coupling between Mn ions can be transformed into a superposition of magnetic states. In particular, the intrinsic magnetic moments in the hydroxylated/halogenated Mn2C monolayer can attain up to 6μB per unit cell. It is found that oxygen termination induces flat bands in the band structure, which evidence for the strong electron correlations and could lead to the implementation of exotic quantum phases in 2D crystals and high-temperature superconductivity. Along with the potential of the hydroxylated Mn2C monolayer characterized by the half-metallicity for application in spintronic devices as a perfect spin injector/detector, this material like other conventional MXenes is promising for the use in energy storage, electromagnetic interference shielding, and sensing.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Ground state of the orbitally ordered PbMnBO4 ferromagnet
Место публикации : JETP Letters. - 2022. - Vol. 115, Is. 11. - P.679-684. - ISSN 00213640 (ISSN), DOI 10.1134/S0021364022600860
Примечания : Cited References: 40
Аннотация: The ground state of the four-sublattice PbMnBO4 ferromagnet is investigated taking into account the symmetry of the crystal and the spatial distribution of the orbital states of the Mn3+ ions. By numerical minimization of the energy of the ground state of the classical model with three types of anisotropy—single-ion, dipole–dipole, and Dzyaloshinskii–Moriya interaction—the anisotropic interaction parameters for magnetic phases with different orientations of the total magnetization in the crystal are obtained. It is demonstrated that the experimentally observed state with the magnetization directed along the a orthorhombic axis becomes the ground state only in the presence of antisymmetric anisotropic exchange.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prosnikov M. A., Bal M. E., Kolkov M. I., Pankrats A. I., Pisarev, R., V, Christianen, P. C. M.
Заглавие : Subterahertz and terahertz spin and lattice dynamics of the insulating ferromagnet PbMnBO4
Коллективы : RFBRRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [20-42-240006]; BASIS Foundation [21-1-4-33-1]; HFML-RU/NWO-I, a member of the European Magnetic Field Laboratory (EMFL)
Место публикации : Phys. Rev. Res. - 2022. - Vol. 4, Is. 1. - Ст.013004. - ISSN 2643-1564(eISSN), DOI 10.1103/PhysRevResearch.4.013004
Примечания : Cited References: 62. - M.A.P. greatly acknowledges D. A. Andronikova for aid, B. T. Crow for fruitful discussions, and P. Albers for technicalassistance. Crystal growth was supported by RFBR and the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, through Research Project No. 20-42-240006. The theoretical part of the spin dynamics calculations was supported by BASIS Foundation Grant No. 21-1-4-33-1. The support of HFML-RU/NWO-I, a member of the European Magnetic Field Laboratory (EMFL) , is acknowledged
Предметные рубрики: LIGHT-SCATTERING
ANTI-STOKES
BRILLOUIN-SCATTERING
Аннотация: Orthorhombic PbMnBO4 is a rare example of an insulating ferromagnet in which the magnetic properties, in particular the strong magnetic anisotropy, are determined by the Mn3+ Jahn-Teller ion. Here, we report on the detailed investigation of magnetic excitations in the subterahertz and terahertz frequency ranges, as well as lattice excitations in the terahertz range. Using polarized azimuthally resolved Raman spectroscopy, four branches of magnetic excitations were observed and assigned to one acoustic and three optical one-magnon modes. The coupling between ferromagnetic ordering at TC=31K and the Jahn-Teller distortions of [MnO6] octahedra due to the spin-phonon interaction was directly observed for some specific phonon modes involved in these distortions. A spin-wave Hamiltonian was developed that allowed us to determine a unique set of exchange and effective anisotropy parameters. The intensity ratio of the anti-Stokes to Stokes acoustic magnon peaks is found to be anomalous and directly indicates the involvement of the magneto-optical parameters in the magnetic Raman scattering process.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Begunovich L. V., Korshunov M. M., Ovchinnikov S. G.
Заглавие : Magnetic collapse in Fe3Se4 under high pressure
Место публикации : Materials. - 2022. - Vol. 15, Is. 13. - Ст.4583. - ISSN 19961944 (ISSN), DOI 10.3390/ma15134583
Примечания : 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
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Ground State of a Two-Sublattice Anisotropic Ferromagnet in a Magnetic Field
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Krasnoyarsk Territorial Foundation [20-42-240006]
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 8. - P.1253-1261. - ISSN 1063-7834, DOI 10.1134/S1063783421080199. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 38. - This study was supported by the Russian Foundation for Basic Research and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-240006 "Synthesis and Study of Pb2+-and Bi3+Containing Oxide Single Crystals with Partial Substitution in One of the Subsystems: Magnetic Structures and Magnetodielectric Effect"
Предметные рубрики: ANTIFERROMAGNETIC-RESONANCE
SUPEREXCHANGE INTERACTION
WEAK FERROMAGNETISM
Аннотация: The ground state of a classical two-sublattice ferromagnet with the noncollinear single-ion anisotropy axes of the sublattices and the antisymmetric and anisotropic symmetric exchanges between them has been investigated in a magnetic field applied along the hard magnetization directions in the crystal. The threshold relations for the parameters of the anisotropic interactions have been obtained, which determine the choice of the ground state among the three possible magnetic phases. Depending on the ground state type and the field direction, the transition between the phases is a first- or second-order phase transition. The antisymmetric exchange value above which the reorientation between the noncollinear phases ends with a second-order transition depends on the angle between the local easy axes and the single-ion anisotropy value. Field dependences of the magnetization and susceptibility for different ground states have been calculated. A comparison with the results of the magnetic measurements in the highly anisotropic PbMnBO4 ferromagnet has been made.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Single-ion weak antiferromagnetism and spin-flop transition in a two-sublattice ferromagnet
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 7. - P.1165-1171. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783420070148
Примечания : Cited References: 26. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk krai, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 18-42-240008 “Effect of the Magnetic Structure on the Magnetodielectric Properties of Oxide Crystallites Containing Stereoactive Pb 2+ and Bi 3+ Ions”
Аннотация: The ground state of a Heisenberg ferromagnet with the noncollinear single-ion anisotropy axes of two magnetic sublattices has been investigated in an external magnetic field applied in the anisotropy axes plane. Noncollinearity of the sublattice local anisotropy axes leads to a new effect called the orientational first-order spin-flop phase transition. The transition field depends on the single-ion anisotropy value and sublattice local axes orientation. An analysis of the stability of magnetic states shows that the transition is accompanied by the hysteretic field dependence of the magnetization. The dependences of the spin-flop transition field, magnetization jump, and susceptibility on the single-ion anisotropy value and axes orientation have been determined. The results obtained are used to explain the field dependence of the magnetization in the PbMnBO4 ferromagnetic crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov A. S., Luk'yanenko A. V., Bondarev I. A., Yakovlev I. A., Varnakov S. N., Ovchinnikov S. G., Volkov N. V.
Заглавие : Spin accumulation in the Fe3Si/n-Si epitaxial structure and related electric bias effect
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk krai; Krasnoyarsk Territorial Foundation [18-42-243022]; Grant of the Government of the Russian Federation for Creation of World Level Laboratories [075-15-2019-1886]
Место публикации : Tech. Phys. Lett. - 2020. - Vol. 46, Is. 7. - P.665-668. - ISSN 1063-7850, DOI 10.1134/S1063785020070135. - ISSN 1090-6533(eISSN)
Примечания : Cited References: 17. - This study was supported by the Russian Foundation for Basic Research, the Government of Krasnoyarsk krai, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities (project no. 18-42-243022), and a Grant of the Government of the Russian Federation for Creation of World Level Laboratories (agreement no. 075-15-2019-1886)
Предметные рубрики: TRANSPORT
Аннотация: The electrical injection of the spin-polarized current into silicon in the Fe3Si/n-Si epitaxial structure is demonstrated. The spin accumulation effect is examined by measuring the local and nonlocal voltage in a special four-terminal device. The observed effect of the electric bias on the spin signal is discussed and compared with the results obtained for ferromagnet/semiconductor structures.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Lukyanenko A. V., Shanidze L. V., Volochaev M. N., Zelenov F. V., Baron F. A., Yakovlev I. A., Tarasov I. A., Bondarev I. A., Varnakov S. N., Ovchinnikov S. G., Volkov N. V., Tarasov A. S.
Заглавие : Transport properties of spintronic devices fabricated from ferromagnet/silicon hybrid structures
Коллективы : 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", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : 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.O8. - P.66-67. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 2. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund by project No. 18-42-243022
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Martynov S. N., Popkov S. I., Krasikov A. A., Balaev A. D., Gorev M. V.
Заглавие : Peculiarities of a magnetic transition in a quasi-one-dimensional ferromagnet PbMnBO4
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 471. - P.416-422. - ISSN 03048853 (ISSN) , DOI 10.1016/j.jmmm.2018.09.098
Примечания : Cited References: 22. - This work was supported by the Russian Foundation for Basic Research, Project no. 16-02-00563. The authors thank V. Zinenko and V. Sosnin for the fruitful and useful discussions.
Аннотация: Near the Curie temperature TC = 30.3 K, the temperature dependences of the magnetization and heat capacity of a single-crystal ferromagnet PbMnBO4 in the magnetic fields of 1, 3, 10 and 30 kOe are studied. In the strong magnetic fields, both the magnetic contribution to the specific heat and the nonlinearity of the field dependences of the magnetization are maintained up to the temperatures exceeding TC more than twice. It is assumed that in PbMnBO4 the difference between TC, the paramagnetic Curie temperature θ = 49 K and the broad temperature region above TC where the magnetic contribution to the specific heat is significant is due to the quasi-one-dimensional character of the magnetic structure of this ferromagnet. Using both the estimation of TC from the Ginzburg-Landau field theory and the θ value, the total exchange interaction parameters 2J ≈ 40.4 K (intrachain) and z′J′ ≈ 8.8 K (interchain) are determined, with z′ = 4 being the number of neighboring chains. The estimation shows that the Ginzburg-Landau field theory describing the quasi-one-dimensional behavior of PbMnBO4 is well applicable in the temperature range from to T = S2J ≈ 80 K. Above this temperature, the mean field approximation with the exchange parameter λθ based on the paramagnetic Curie temperature θ describes well the experimental temperature dependences of the magnetization in the strong magnetic field and the specific heat is determined by the lattice contribution.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Troyanchuk I. O., Bushinsky M. V., Tereshko N. V., Lanovsky R. A., Sikolenko V. V., Ritter C., Orlov Yu. S., Ovchinnikov S. G.
Заглавие : Ferromagnet-antiferromagnet transition in layered perovskites of Sr3YCo4O10.5 type
Коллективы : Belarussian Foundation for Basic Research [F18R-159]; Russian Foundation Basic Research [18-52-00017 Bel_a, 16-02-00507, 18-52-00020]; Council on grants of the President of the Russian Federation [SP-1844.2016.1]
Место публикации : Mater. Res. Express. - 2019. - Vol. 6, Is. 2. - Ст.026105. - ISSN 2053-1591, DOI 10.1088/2053-1591/aaef21
Примечания : Cited References: 30. - This work was supported by the Belarussian Foundation for Basic Research (project F18R-159) and Russian Foundation Basic Research (contract no. 18-52-00020). Yu S Orlov and SG Ovchinnikov are grateful Russian Foundation Basic Research (contracts no. 18-52-00017 Bel_a, 16-02-00507) and Council on grants of the President of the Russian Federation (SP-1844.2016.1) for the support.
Предметные рубрики: SPIN
NANOWIRES
Ключевые слова (''Своб.индексиров.''): neutron diffraction--orbital ordering--spin state
Аннотация: Sr1−xYxCoO2.65 (x = 0.2) with layered perovskite structure was studied by neutron diffraction, synchrotron x-ray and magnetometry methods. It is shown that in the 90–375 K temperature range the crystal structure can be described by the monoclinic space group A2/m with the superstructure 4√2a p × 2√2a p × 4a p (with a p corresponding to the unit cell parameter of the primitive cell) while basic diffraction peaks are well indexed in the space group I4/mmm (2a p × 2a p × 4a p ) shows an almost standard magnetization. The basic magnetic structure is G-type antiferromagnetic with average magnetic moments of 2.7 μ B/Co and 1.7 μ B/Co in anion-deficient CoO4+γ and stoichiometric CoO6 layers, respectively. A ferromagnetic component of about 0.27 μ B/Co is determined from the magnetization measurements at 8 K. Sr0.8Y0.2CoO2.65 shows an almost standard magnetization versus temperature dependence whereas Sr0.75Y0.25CoO2.65 exhibits an antiferromagnet-ferromagnet transition accompanied by a structural transformation. There is practically no spontaneous magnetization in x = 0.3. The type of the magnetic structure and the high value of TN suggest that the Co3+ ions are in both structural layers predominantly in the low-spin (LS)/high-spin (HS) state mixture. It is proposed that the ferromagnetic component is due to the orbital ordering occurring at TN in the CoO5 pyramids and the concomitant appearance of ferromagnetic coupling between the Co3+(HS) ions located in these CoO5 pyramids in the anion-deficient CoO4+γ layer.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Панкрац, Анатолий Иванович, Колков, Максим Игоревич, Мартынов, Сергей Николаевич, Попков, Сергей Иванович, Красиков, Александр Александрович, Балаев, Александр Дмитриевич
Заглавие : Размытый магнитный переход в квазиодномерном ферромагнетике PbMnBO4
Коллективы : Совещание по физике низких температур, Институт физических проблем им. П. Л. Капицы РАН, Южный федеральный университет
Место публикации : XXXVIII Совещание по физике низких температур (НТ-38): тезисы докладов: 17-22 сентября 2018 г., г. Москва - г. Ростов-на-Дону – пос. Шепси. - Ростов-на-Дону, 2018. - С. 50-51. - ISBN 978-5-6041447-8-7
Примечания : Библиогр.: 2. - Работа выполнена при поддержке РФФИ, грант 16-02-00563
Аннотация: В работе представлены результаты измерения полевых зависимостей магнитострикции и намагниченности в монокристаллах тетрафторидов редких земель YbLiF4 и DyLiF4 в сильных магнитных полях (до 8 Тесла) в различных направлениях приложенного внешнего магнитного поля при различных температурах (2 - 10К). Из анализа экспериментальных данных получены оценки параметров электрон-деформационного взаимодействия для данных соединений.In this study field dependencies magnetostriction and magnetization of single crystals rare-earth tetrfluorides were measured in the strong magnetic fields (up to 8T) applied along and perpendicular to the crystallographic axis at different temperatures (2-10K). Approximate values of electron-deformations interaction were found from these experimental results.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tarasov A. S., Lukyanenko A. V., Bondarev I. A., Rautskii M. V., Baron F. A., Smolyarova T. E., Yakovlev I. A., Varnakov S. N., Ovchinnikov S. G., Volkov N. V.
Заглавие : Synthesis of 3-terminal ferromagnet/silicon spintronics devices and their transport properties
Коллективы : Nanostructures: Physics and Technology, International Symposium, Институт физики им. Б. И. Степанова НАН Беларуси, Санкт-Петербургский национальный исследовательский Академический университет Российской академии наук, Физико-технический институт им. А.Ф. Иоффе РАН, Научно-технологический центр микроэлектроники и субмикронных гетероструктур Российской академии наук
Место публикации : Nanostructures: physics and technology: proc. 26th Int. symp. - 2018. - P.245-246. - ISBN 978-985-7202-35-5
Примечания : Cited References: 9
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov A. S., Lukyanenko A. V., Bondarev I. A., Rautskii M. V., Baron F. A., Smolyarova T. E., Yakovlev I. A., Varnakov S. N., Ovchinnikov S. G., Volkov N. V.
Заглавие : Fabrication and DC/AC characterization of 3-terminal ferromagnet/silicon spintronics devices
Место публикации : Semiconductors. - 2018. - Vol. 52, Is. 14. - P.1875–1878. - ISSN 1063-7826, DOI 10.1134/S1063782618140312. - ISSN 1090-6479 (eISSN)
Примечания : Cited References: 10. - The work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund project no. 18-42-243022. This work is partially supported by the Ministry of Education and Science of the Russian Federation and by Siberian Branch of the Russian Academy of Sciences (project II.8.70) and Fundamental research program of the Presidium of the RAS no. 32 “Nanostructures: physics, chemistry, biology, basics of technologies”.
Аннотация: CMOS and SOI technology compatible structures and devices are currently intensively investigated by many research groups, since various effects observed in such structures can be relatively easy implemented in electronic devices thereby expanding their functionality. The most promising is the research and development of spintronic devices, which will allow using both electron charge and spin degrees of freedom for transmission, storage and processing of information. In this work we report the fabrication process of 3-terminal (3-T) ferromagnet/silicon devices of two types. First is the planar Fe3Si/Si 3-T structure with 5 μm gap between closest ferromagnetic electrodes. Second is silicon nanowire back-gate transistor with Fe film source and drain synthesized on SOI substrate. Transport and magnetotransport properties of both devices are investigated.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Martynov S. N.
Заглавие : Ground state of the classical frustrated heisenberg ferromagnet in a magnetic field
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-K-37. - P.939 (Шифр 29916280)
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16.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Popkov S. I., Sablina K. A., Balaev A. D., Miskiv A.
Заглавие : Magnetic order-disorder transition in the ferromagnet PbMnBO4 under the external magnetic field
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.4PO-I1-45. - P.900 (Шифр 29916280)
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N., Tugarinov V. I., Martynov A. S.
Заглавие : Continual approach in the mean field theory of incommensurate magnetic states in the Frustrated Heisenberg ferromagnet
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2017. - Vol. 10, Is. 1. - P.55-59. - ISSN 1997-1397, DOI 10.17516/1997-1397-2017-10-1-55-59; Журн. СФУ. Сер. "Математика и физика"
Примечания : Cited References: 3
Аннотация: The algorithm of approximate solution has been 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 obvious dependence of the angle velocity from angle and initial condition has been derived by expanding the first integral of the equation in the Taylor series in vicinity of initial condition. © Siberian Federal University. All rights reserved.Разработан алгоритм приближенного решения дифференциального уравнения, описывающего ангармоническое изменение угла ориентации спина в модели легкоосного ферромагнетика с конкуренцией обменов между ближайшими и следующими за ближайшими магнитными соседями. Явная зависимость угловой скорости от угла и начального условия получена путем разложения первого интеграла уравнения в ряд Тейлора в окрестности начального условия
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N., Tugarinov V. I.
Заглавие : Phase diagram of the ground state of a classical anisotropic frustrated ferromagnet
Место публикации : JETP Letters. - 2017. - Vol. 106, Is. 1. - P.30-34. - ISSN 0021-3640, DOI 10.1134/S0021364017130124. - ISSN 1090-6487(eISSN)
Примечания : Cited References:25
Предметные 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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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Martynov S. N., Tugarinov V. I., Martynov A. S.
Заглавие : Continual approach at T=0 in the mean field theory of incommensurate magnetic states in the frustrated Heisenberg ferromagnet with an easy axis anisotropy
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P.47-49. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2016.12.086. - ISSN 1873-4766(eISSN)
Примечания : Cited References:9
Предметные рубрики: FERRIMAGNET
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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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Velikanov D. A., Rabinovich K. S., Samoilenko L. L.
Заглавие : Magnetic properties of Ba2Cu3O4Cl2
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P2.16. - P.158. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 4
Ключевые слова (''Своб.индексиров.''): layered cuprate--magnetic moment--coercivity--remanence--weak ferromagnet
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