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    Самопроизвольное вращение магнитов, левитирующих над высокотемпературным сверхпроводником / Д. М. Гохфельд, С. Ю. Шаломов, Д. Б. Сультимов, М. И. Петров // Сверхпроводимость: фунд. и приклад. исслед. - 2024. - № 1. - С. 34-40 ; Supercond. Fund. Appl. Res., DOI 10.62539/2949-5644-2024-0-1-34-40. - Библиогр.: 11. - Авторы выражают благодарность А.Л. Фрейдману за создание сверхпроводящей платформы, С.В. Семенову за помощь с температурными измерениями, а также С.В. Комогорцеву за полезные обсуждения . - ISSN 2949-5644. - ISSN 2949-5660
   Перевод заглавия: Spontaneous rotation of magnets levitating above high-Tc superconductor
Кл.слова (ненормированные):
тепловая машина -- левитация -- REBCO -- композитная сверхпроводящая лента -- NdFeB -- heat machine -- levitation -- REBCO -- composite superconducting tape -- NdFeB
Аннотация: Левитация постоянного магнита цилиндрической формы над высокотемпературным сверхпроводником, охлаждаемым жидким азотом, сопровождается спонтанными колебаниями, переходящими во вращение. Причиной вращения является неоднородность намагниченности магнита, вызванная градиентом температур вдоль вертикальной оси. Проведен эксперимент по левитации магнитов Nd–Fe–B над композитным высокотемпературным сверхпроводником. Результаты эксперимента подтверждают, что частота вращения зависит от намагниченности верхней и нижней половин магнита. Предложены способы контроля частоты вращения левитирующего магнита.
Levitation of a cylindrical permanent magnet over a high-temperature superconductor cooled by liquid nitrogen can be accompanied by spontaneous oscillations and rotation. The reason for spontaneous rotation of the magnet is magnetization inhomogeneity induced by the temperature gradient. An experiment was carried out on the levitation of Nd–Fe–B magnets over a composite high-temperature superconductor. The experimental results confirm that the rotation frequency depends on the difference in the magnetization values in its upper and lower halves of the magnet. Methods for controlling the rotation frequency of a levitating magnet are proposed.

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Держатели документа:
Институт физики им. Л.В. Киренского ФИЦ КНЦ СО РАН, ул. Академгородок 50/38, 660036, Красноярск, Россия
Красноярский Государственный Педагогический Университет им. В.П. Астафьева, ул. А. Лебедевой 89, 660049, Красноярск, Россия
Физико-математическая школа Сибирского Федерального Университета, пр. Свободный 79, 660041, Красноярск, Россия

Доп.точки доступа:
Гохфельд, Денис Михайлович; Gokhfeld, D. M.; Шаломов, С. Ю.; Сультимов, Д. Б.; Петров, Михаил Иванович; Petrov, M. I.

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Flux pinning docking interfaces in satellites using superconducting foams as trapped field magnets / M. R. Koblischka, A. Koblischka-Veneva, D. Gokhfeld [et al.] // IEEE Trans. Appl. Supercond. - 2022. - Vol. 32, Is. 4. - Ст. 4900105, DOI 10.1109/TASC.2022.3147734. - Cited References: 44. - This work was supported in part by SUPERFOAM international project funded by ANR and DFG under Grants ANR-17-CE05-0030 and DFG-ANR Ko2323-10. . - ISSN 1051-8223. - ISSN 1558-2515

РУБ Engineering, Electrical & Electronic + Physics, Applied
Рубрики:
BULK
RECONFIGURATION
MAGNETIZATION
Кл.слова (ненормированные):
Superconducting magnets -- Satellites -- Yttrium barium copper oxide -- Magnetomechanical effects -- Magnetic fields -- Superconducting coils -- Magnetometers -- Flux-pinning docking interface -- Foams -- Trapped field magnets -- YBCO
Аннотация: Flux-Pinning Docking Interfaces (FPDI) in satellite systems were developed using bulk superconductors and permanent magnets in previous works. However, such FPDIs have limited magnetic field strength, consist of heavy-weight material, and can only be used with a single purpose, i.e., as chasing or docking satellite. Replacing the magnetic material in the FPDI by a trapped field (TF)-magnet would enable the interface to operate for both purposes, i.e., generating a (stronger) magnetic field and trapping it. We show the requirements for such a system and discuss the possible gains when using a TF-FPDI in satellites. To reduce the system weight, the use of superconducting foams as superconducting material is discussed in detail. Furthermore, the use of superconducting foams, the size of which can be easily upscaled, may also comprise the function of the damping material, so even more weight could be saved for the payload.

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Держатели документа:
Saarland Univ, Dept Expt Phys, D-66041 Saarbrucken, Germany.
Shibaura Inst Technol, Tokyo 1358548, Japan.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Tokyo Univ Sci, Dept Phys, Tokyo 1628601, Japan.
Univ Lorraine, GREEN, F-54000 Nancy, France.

Доп.точки доступа:
Koblischka, Michael R.; Koblischka-Veneva, Anjela; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Naik, S. Pavan Kumar; Nouailhetas, Quentin; Berger, Kevin; Douine, Bruno; ANRFrench National Research Agency (ANR); DFGGerman Research Foundation (DFG)European Commission [ANR-17-CE05-0030, DFG-ANR Ko2323-10]
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Effective easy-axis anisotropy of the two-sublattice single-chain magnet with twisted easy planes / M. S. Shustin, M. N. Potkina // Nanosyst. - Phys. Chem. Math. - 2020. - Vol. 11, Is. 6. - P. 659-665 ; Наносистемы: физ., хим., матем., DOI 10.17586/2220-8054-2020-11-6-659-665. - Cited References: 15. - S. M. S. expresses deep gratitude to V. V. Val'kov. The main results of this work were with substantial use of the theory developed by him (see for example articles [10], [12] and references given in them), as well as on his previous advice. S. M. S. and M. N. P. acknowledges the support from the Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" (Grants No. 20-1-4-25-1 and 19-1-1-12-2, respectively) . - ISSN 2220-8054. - ISSN 2305-7971

РУБ Nanoscience & Nanotechnology

Кл.слова (ненормированные):
single-chain magnets -- magnonic spectrum -- strong single-ion anisotropy
Аннотация: An analytical solution for the spin-wave spectrum of the two-sublattice 1D magnet with SA = SB = 1 and twisting easy planes has been obtained. Such planes are mutually twisted by an angle φ relative to each other. For the case of mutually orthogonal easy planes φ = π/2, the spectrum vs. quasi-momentum dependence has been compared with that of an easy-axis magnet with the easy axis aligned along the line of intersection of the planes. An analogy of the spectra of the models has been shown, indicating the possibility of the effective easy axis anisotropy in easy-plane two-sublattice single-chain magnets.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
ITMO Univ, Kronverkskiy 49, St Petersburg 197101, Russia.
St Petersburg State Univ, St Petersburg 198504, Russia.
Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland.
Univ Iceland, Fac Phys Sci, IS-107 Reykjavik, Iceland.

Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Potkina, M. N.; Foundation for the Advancement of Theoretical Physics and Mathematics "BASIS" [20-1-4-25-1, 19-1-1-12-2]

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Cherkasskii, M.
Nutation resonance in ferromagnets / M. Cherkasskii, M. Farle, A. Semisalova // Phys. Rev. B. - 2020. - Vol. 102, Is. 18. - Ст. 184432, DOI 10.1103/PhysRevB.102.184432. - Cited References: 42. - We thank Benjamin Zingsem for helpful discussions. In part funded by Research Grant No. 075-15-2019-1886 from the Government of the Russian Federation, the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Projects No. 405553726 (CRC/TRR 270) and No. 392402498 (SE 2853/1-1) . - ISSN 2469-9950
Кл.слова (ненормированные):
Ferromagnetism -- Magnets -- Resonance -- Analytical expressions -- Applied magnetic fields -- Ferromagnets -- Frequency dependent susceptibility -- Inertial dynamics -- Landau-Lifshitz-Gilbert equations -- Microwave excitations -- Ferromagnetic materials
Аннотация: The inertial dynamics of magnetization in a ferromagnet is investigated theoretically. The analytically derived dynamic response upon microwave excitation shows two peaks: ferromagnetic and nutation resonances. The exact analytical expressions of frequency and linewidth of the magnetic nutation resonance are deduced from the frequency-dependent susceptibility determined by the inertial Landau-Lifshitz-Gilbert equation. The study shows that the dependence of nutation linewidth on the Gilbert precession damping has a minimum, which becomes more expressive with increase of the applied magnetic field.

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Держатели документа:
Department of General Physics 1, St. Petersburg State University, St. Petersburg, 199034, Russian Federation
Faculty of Physics and Center of Nanointegration (CENIDE), University of Duisburg-Essen, Duisburg, 47057, Germany
Kirensky Institute of Physics, Federal Research Center, Ksc Sb Ras, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Farle, M.; Фарле, Михаель; Semisalova, A.
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Metal-organic magnets with large coercivity and ordering temperatures up to 242°C / P. Perlepe, I. Oyarzabal, A. Mailman [et al.] // Science. - 2020. - Vol. 370, Is. 6516. - P. 587-591, DOI 10.1126/science.abb3861. - Cited References: 42. - This work was supported by the University of Bordeaux, the Region Nouvelle Aquitaine, Quantum Matter Bordeaux, and the Centre National de la Recherche Scientifique (CNRS). I.O. and R.C. are grateful to the Basque Government for I.O.'s postdoctoral grant. K.S.P. thanks the VILLUM FONDEN for a Villum Young Investigator grant (15374). A.M. thanks JYU and the Academy of Finland (project 289172) for support . - ISSN 0036-8075. - ISSN 1095-9203

РУБ Multidisciplinary Sciences
Рубрики:
ROOM-TEMPERATURE
   CHROMIUM
   FERROMAGNETISM
   DIFFRACTION
   COMPLEXES
Аннотация: Magnets derived from inorganic materials (e.g., oxides, rare-earth–based, and intermetallic compounds) are key components of modern technological applications. Despite considerable success in a broad range of applications, these inorganic magnets suffer several drawbacks, including energetically expensive fabrication, limited availability of certain constituent elements, high density, and poor scope for chemical tunability. A promising design strategy for next-generation magnets relies on the versatile coordination chemistry of abundant metal ions and inexpensive organic ligands. Following this approach, we report the general, simple, and efficient synthesis of lightweight, molecule-based magnets by postsynthetic reduction of preassembled coordination networks that incorporate chromium metal ions and pyrazine building blocks. The resulting metal-organic ferrimagnets feature critical temperatures up to 242°C and a 7500-oersted room-temperature coercivity.

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Держатели документа:
Univ Bordeaux, CNRS, Ctr Rech Paul Pascal, UMR 5031, F-33600 Pessac, France.
Univ Bordeaux, Bordeaux INP, ICMCB, UMR 5026, F-33600 Pessac, France.
Univ Basque Country, UPV EHU, Chem Fac, Donostia San Sebastian 20018, Spain.
Univ Jyvaskyla, Dept Chem, FI-40014 Jyvaskyla, Finland.
ESRF European Synchrotron, CS, F-38043 Grenoble 9, France.
Swiss Norwegian Beamlines European Synchrotron Ra, F-38000 Grenoble, France.
Univ Bordeaux, CNRS, Lab Ondes & Matiere Aquitaine, F-33400 Talence, France.
Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England.
Univ Bordeaux, Bordeaux INP, ISM, UMR 5255, F-33400 Talence, France.
Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark.
Kirensky Inst Phys, Fed Res Ctr KSC SB RAS, Krasnoyarsk 660036, Russia.
PSL Univ, Inst Mat Poreux Paris, UMR CNRS 8004, Ecole Normale Super, F-75005 Paris, France.

Доп.точки доступа:
Perlepe, Panagiota; Oyarzabal, Itziar; Mailman, Aaron; Yquel, Morgane; Platunov, M. S.; Платунов, Михаил Сергеевич; Dovgaliuk, Iurii; Rouzieres, Mathieu; Negrier, Philippe; Mondieig, Denise; Suturina, Elizaveta A.; Dourges, Marie-Anne; Bonhommeau, Sebastien; Musgrave, Rebecca A.; Pedersen, Kasper S.; Chernyshov, Dmitry; Wilhelm, Fabrice; Rogalev, Andrei; Mathoniere, Corine; Clerac, Rodolphe; University of Bordeaux; Region Nouvelle AquitaineRegion Nouvelle-Aquitaine; Quantum Matter Bordeaux; Centre National de la Recherche Scientifique (CNRS)Centre National de la Recherche Scientifique (CNRS); Basque GovernmentBasque Government; VILLUM FONDEN [15374]; Academy of FinlandAcademy of Finland [289172]
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    Superconducting YBCO Foams as Trapped Field Magnets / M. R. Koblischka [et al.] // Materials. - 2019. - Vol. 12, Is. 6. - Ст. 853, DOI 10.3390/ma12060853. - Cited References: 62. - This work is part of the SUPERFOAM international project funded by ANR and DFG under the references ANR-17-CE05-0030 and DFG-ANR Ko2323-10, respectively. Further funding by a SIT start-up grant is also gratefully acknowledged. . - ISSN 1996-1944
   Перевод заглавия: Сверхпроводящие YBCO пены в качестве магнитов, действующих благодаря захваченному полю

РУБ Materials Science, Multidisciplinary
Рубрики:
CRITICAL CURRENT-DENSITY
   TRANSPORT-PROPERTIES
   SINGLE-GRAIN
   BULK
Кл.слова (ненормированные):
High-Tc superconductors -- YBCO -- foam -- trapped fields -- current flow
Аннотация: Superconducting foams of YBa2Cu3Oy (YBCO) are proposed as trapped field magnets or supermagnets. The foams with an open-porous structure are light-weight, mechanically strong and can be prepared in large sample sizes. The trapped field distributions were measured using a scanning Hall probe on various sides of an YBCO foam sample after field-cooling in a magnetic field of 0.5 T produced by a square Nd-Fe-B permanent magnet. The maximum trapped field (TF) measured is about 400 G (77 K) at the bottom of the sample. Several details of the TF distribution, the current flow and possible applicatons of such superconducting foam samples in space applications, e.g., as active elements in flux-pinning docking interfaces (FPDI) or as portable strong magnets to collect debris in space, are outlined.

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Держатели документа:
Shibaura Inst Technol, Dept Mat Sci & Engn, Superconducting Mat Lab, Tokyo 1358548, Japan.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
ACCESS, Intzestr 5, D-52072 Aachen, Germany.
Natl Inst Adv Ind Sci & Technol, Elect & Photon Res Inst, Superconducting Elect Grp, 1-1-1 Cent 2, Tsukuba, Ibaraki 3058568, Japan.
Raychem RPG Pvt Ltd, Aga Abbas Ali Rd Off Halasur Rd, Bangalore 560042, Karnataka, India.

Доп.точки доступа:
Koblischka, Michael R.; Naik, Sugali Pavan Kumar; Koblischka-Veneva, Anjela; Murakami, Masato; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Reddy, Eddula Sudhakar; Schmitz, Georg J.; ANR [ANR-17-CE05-0030]; DFG [DFG-ANR Ko2323-10]; SIT start-up grant
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Structure and magnetic properties of (Sm0.9Zr0.1)Fe11Ti alloys with ThMn12-type structure / D. S. Neznakhin [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 484. - P. 212-217, DOI 10.1016/j.jmmm.2019.04.030. - Cited References: 40. - This work was supported by MES of RF (contract No. 3.6121.2017/8.9) and by Act 211 Government of RF (agreement No. 02.A03.21.0006). TEM was performed in the Center for Shared Use of Federal Research Center KSC SB RAS. . - ISSN 0304-8853
Кл.слова (ненормированные):
ThMn 12 -type phase -- Permanent magnets -- Rare earth-lean magnets
Аннотация: Rapidly increasing demand for high-energy permanent magnets and volatility of the rear-earth market encourage a search of hard magnetic materials that can compete with those based on the Nd2Fe14B phase. Sm-Fe compounds with the ThMn12-type crystal structure are considered as promising candidates for it. However, their synthesis and achievement of theoretically predicted magnetic properties are still challenging tasks that have not been solved yet. This paper addresses this problem. Its aim was to synthesize and to study magnetic properties of the (Sm0.9Zr0.1)Fe11Ti compound with ThMn12-type structure. Initially amorphous alloy was obtained by melt spinning and its subsequent heat treatments were performed. Structural and phase transformations of the (Sm0.9Zr0.1)Fe11Ti alloy with annealing temperatures were studied along with magnetic properties. For the optimally annealed alloy features of magnetization reversal were discussed and temperature dependences of coercivity and maximum energy product were obtained.

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Держатели документа:
Ural Federal University, Yekaterinburg, 620002, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Neznakhin, D. S.; Andreev, S. V.; Semkin, M. A.; Selezneva, N. V.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Bolyachkin, A. S.; Kudrevatykh, N. V.; Volegov, A. S.
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    Val'kov, V. V.
    The modification of low-temperature magnetic properties of the Fe-based double-zigzag single-chain magnet under irradiation / V. V. Val'kov, M. S. Shustin // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 19-22, DOI 10.1016/j.jmmm.2016.12.100. - Cited References: 14. - This study was supported by the Presidium of the Russian Academy of Sciences, program Actual problems of low temperature physics (project 0358-2015-0005); the Russian Foundation for Basic Research, projects nos. 16-42-243057 (partly with Government of Krasnoyarsk Territory) and 15-42-04372; Technology Support Fund to the research project nos. 14/16. The work of M.S.S. was supported by grant of the President of the Russian Federation (project MK-1398.2017.2). . - ISSN 0304-8853
   Перевод заглавия: Модификация низкотемпературных свойств железо содержащего одноцепочечного магнетика с магнитной топологией двойного зигзага

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPIN-CROSSOVER
MODEL
Кл.слова (ненормированные):
Single-chain magnets -- Light-induced spin crossover -- Magnetic susceptibility -- Quantum phase transitions
Аннотация: An exact solution for a generalized Ising model describing single-chain magnet {[FeIII(Tp*)(CN)3]2FeII(bpmh)}·2H2O with alternating high-spin and low-spin iron ions and double-zigzag magnetic topology has been calculated making use of the transfer-matrix technique. The introduction of a statistical ensemble taking into account the presence of iron ions with high-spin (HS) and low-spin (LS) states made it possible to describe the modification of magnetic susceptibility under optical irradiation. It has been shown that joint implementation of iron ions with photoinduced magnetic states and non-magnetic intersite repulsion ions of these states is caused by the difference of the ionic radii of HSFeIIHSFeII and LSFeIILSFeII leads to the quantum phase transitions in the system.

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Доп.точки доступа:
Shustin, M. S.; Шустин, Максим Сергеевич; Вальков, Валерий Владимирович; 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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Komogortsev, S. V.
Law of approach to magnetic saturation in nanocrystalline and amorphous ferromagnets with improved transition behavior between power-law regimes / S. V. Komogortsev, R. S. Iskhakov // J. Magn. Magn. Mater. - 2017. - Vol. 440. - P. 213-216, DOI 10.1016/j.jmmm.2016.12.145. - Cited References: 41. - The work has been supported by Russian Foundation for Basic Research, Grant nos. 16-03-00256, 15-08-06673 and RFBR-KRFS 15–42-04171. . - ISSN 0304-8853
Кл.слова (ненормированные):
Ferromagnetic materials -- Ferromagnetism -- Magnetic anisotropy -- Magnetism -- Magnets -- Nanocrystals -- Perturbation techniques -- Asymptotic regimes -- Law of approaches -- Nanocrystalline and amorphous -- Perturbation theory -- Power law regime -- Random magnetic anisotropies -- Transition behavior -- Transition modes -- Saturation magnetization
Аннотация: New law of the approach to magnetic saturation is proposed based on scaling in ferromagnets with random magnetic anisotropy. This law is consistent with the known laws derived within perturbation theory in extreme cases, but it describes the transition mode between the power-low asymptotic regimes better. The improved law is proper for reliable fitting the approach magnetization to saturation in nanocrystalline and amorphous ferromagnets. © 2017 Elsevier B.V.

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Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Комогорцев, Сергей Викторович; 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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10.

    Val'kov, V. V.
    Quantum theory of strongly anisotropic two- and four-sublattice single-chain magnets / V. V. Val'kov, M. S. Shustin // J. Low Temp. Phys. - 2016. - Vol. 185, Is. 5-6. - P. 564-570, DOI 10.1007/s10909-015-1457-9. - Cited References:17. - This study was supported by the Presidium of the Russian Academy of Sciences, program "Actual problems of low temperature physics"; the Russian Foundation for Basic Research, Projects Nos. 13-02-00523, 14-02-31280 and 15-42-04372. . - ISSN 0022-2291. - ISSN 1573-7357
   Перевод заглавия: Квантовая теория сильно анизотропных двух- и четырехподрешеточных одноцепочечных магнетиков

РУБ Physics, Applied + Physics, Condensed Matter

Кл.слова (ненормированные):
Quantum magnets -- Spin wave theory -- Strong single-ion anisotropy
Аннотация: We have developed the spin wave theory of Heisenberg magnets with strong single-ion anisotropy of arbitrary symmetry with two and more sublattices. Using this approach, the low-temperature magnetic properties of the single-chain magnet catena- [FeII(ClO4)2FeIII(bpca)2](ClO4) with four sublattices and twisting mutually orthogonal easy plane have been calculated. It has been shown that the modulation of the easy planes directions creates on the one hand the low-temperature excitation spectrum similar to the one of the Ising models, and on the other hand strong spin fluctuations.

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Держатели документа:
LV Kirenskii Inst Phys, Theoret Phys Lab, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Dept Theoret Phys & Wave Phenomena, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Shustin, M. S.; Вальков, Валерий Владимирович; Presidium of the Russian Academy of Sciences, program "Actual problems of low temperature physics"; Russian Foundation for Basic Research [13-02-00523, 14-02-31280, 15-42-04372]
}
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