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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : BAYUKOV O. A., RUDENKO V. V.
Заглавие : SINGLE-ION-ANISOTROPY INDUCED BY EXCHANGE-TYPE COVALENCE EFFECTS IN RHOMBOHEDRAL ANTIFERROMAGNETICS WITH S-IONS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 34, Is. 8. - P2665-2667. - ISSN 0367-3294
Примечания : Cited References: 15
Предметные рубрики: RESONANCE
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sun S.-J., Hsu, Hua-Shu, Ovchinnikov S. G., Chen G.-L.
Заглавие : Theoretical investigation of magnetic properties in interfaces of magnetic nanoparticles and amorphous carbons
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2017. - Vol. 432. - P.102-105. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2017.02.001
Примечания : Cited References: 21. - We would like to thank the Ministry of Science and Technology, Taiwan, for the Grant No. MOST 104-2112-M-390-001 and 104-2923-M-390-001-MY3 (Shih-Jye Sun). The work is supported also by the President of Russia program of the leading scientific schools, Grant NSh-7559.2016.2.
Ключевые слова (''Своб.индексиров.''): antiferroelectricity--antiferromagnetism--ferromagnetism--molecular dynamics--nanomagnetics--nanoparticles--spin waves--antiferro-magnetic interactions--antiferromagnetics--kondo interactions--magnetic nano-particles--molecular dynamics simulations--spinwave excitation--theoretical investigations--theoretical modeling--amorphous carbon
Аннотация: Based on the experimental finding of the exchange bias in amorphous carbon samples with embedded Co nanoparticles and on the graphited character of the amorphous carbon interface confirmed by molecular dynamics simulations we have proposed the interface of graphited carbon to be antiferromagnetic. A theoretical model, which comprises the Kondo interactions in the interfaces of Co nanoparticles and the induced antiferromagnetic interactions in the graphited carbons, is employed to evaluate the ferromagnetism of the interfaces of Co nanoparticles. We have shown that the ferromagnetism of interfaces of Co nanoparticles will be enhanced by the increase of antiferromagnetic interaction as well as the increase of electron density in the graphited carbons. In particular, we found that the antiferromagnetic interactions in graphited carbons will change the spin-wave excitation in interfaces of Co nanoparticles from the quasiacoustic mode to the quasioptical one. © 2017 Elsevier B.V.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : APLESNIN S. S.
Заглавие : NONPERIODIC STRUCTURES WITH A MULTICOMPONENT ORDER-PARAMETER IN FRUSTRATED ANISOTROPIC HEXAGONAL ANTIFERROMAGNETICS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 34, Is. 12. - P3691-3694. - ISSN 0367-3294
Примечания : Cited References: 7
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GEKHT R. S., GRISHIN V. V.
Заглавие : ON MAGNETIC STATES IN STRONGLY FRUSTRATED 2-DIMENSIONAL ANTIFERROMAGNETICS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 34, Is. 11. - P3557-3559. - ISSN 0367-3294
Примечания : Cited References: 5
Предметные рубрики: PHASE-TRANSITIONS
LATTICE
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Platunov M. S., Kazak N. V., Dudnikov V. A., Wilhelm F., Hen A., Diadkin V., Dovgaliuk I., Bosak A., Temerov V. L., Gudim I. A., Knyazev Yu. V., Gavrilkin S. Yu., Rogalev A., Ovchinnikov S. G.
Заглавие : Probing magnetic sublattices in multiferroic Ho0.5Nd0.5Fe3(BO3)4 single crystal using X-ray magnetic circular dichroism
Место публикации : ArXiv. - 2018. - Ст.1804.07057
Примечания : Cited References: 28. - The study was supported in part by the grants of the Russian Foundation for Basic Research (project nos. 16-32-60049, 17-02-00826) and the Foundation for Assistance to Small Innovative Enterprises (FASIE, UMNIK program). The authors thank the BM01A/ID28/ID12 beamlines staffs for help during the experiment and also gratefully acknowledge the beamtime provision (proposal HC-1804) by the ESRF.
Предметные рубрики: Antiferromagnetics
Magnetic anisotropy
Magnetoelectric effects, multiferroics
Аннотация: Using element-specific X-ray magnetic circular dichroism (XMCD) technique we have studied different magnetic sublattices in a multiferroic Ho0.5Nd0.5Fe3(BO3)4 single crystal. The XMCD measurements at the L2,3-edges of Ho and Nd, and at the Fe \emph{K}-edge have been performed at T=2K under a magnetic field up to 17 T applied along the trigonal c-axis as well as in the basal ab-plane. All three magnetic sublattices are shown to undergo a spin-reorientation transition under magnetic field applied along the c-axis. On the contrary, when magnetic field is applied in the ab-plane only the holmium atoms exhibit a magnetization jump. Thus, the element-specific magnetization curves revealed the Ho sublattice to be much stronger coupled to the Fe one than the Nd sublattice. The results demonstrate that the Ho3+ subsystem plays even more dominant role in magnetic behavior of Ho0.5Nd0.5Fe3(BO3)4 crystal than in pure HoFe3(BO3)4 crystal.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kurilova A. V., Sokolov A. Е., Sukhachev A. L., Ivanova O. S., Bogdanov K. V., Baranov M. A., Dubavik A. Y.
Заглавие : Synthesizing antiferromagnetic α-Fe2O3–rGO discs: Their magnetic and magneto-optical properties
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P.610-613. - ISSN 10628738 (ISSN), DOI 10.3103/S106287382205015X
Примечания : Cited References: 26
Аннотация: A comprehensive study is performed of the properties of hybrid structures of iron oxide and reduced graphene oxide α-Fe2O3/rGO synthesized via “wet mixing.” It is shown that hematite nanoparticles with a comparatively uniform distribution can be encapsulated in graphene layers, and the way of preparing precursors is of critical importance in shaping the magneto-optical properties of α-Fe2O3/rGO hybrid structures.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Balaev A. D., Skorobogatov S. A., Krasikov A. A., Kolkov M. I., Zharkov S. M., Zeer G. M., Pavlovskii M. S., Balaev D. A.
Заглавие : Inclined magnetic structures and magnetic phase diagrams for the Pb2Fe2−xMnxGe2O9 (x = 0.16) single crystal
Место публикации : J. Magn. Magn. Mater. - 2022. - Vol. 563. - Ст.170021. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2022.170021
Примечания : Cited References: 24. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-2 40006 “Synthesis and Study of Pb 2+ and Bi 3+ -Containing Oxide Single Crystals with Partial Substitution in One of the Subsystems: Magnetic Structures and Magnetodielectric Effect”. The SEM and EDS studies were carried out at the Joint Scientific Center of the Siberian Federal University within the state assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation
Аннотация: Single crystals of the Pb2Fe2?xMnxGe2O9 (x = 0.16) antiferromagnet have been grown. Using the specific heat measurements, a Neel temperature of TN = (42.0 ± 0.5) K for the synthesized crystals has been found. It has been shown using the magnetic measurements that, due to the competition between the magnetoanisotropic contributions of the iron and manganese subsystems in the crystals, near a temperature of Tc = 22 K, a spontaneous spin-reorientation transition occurs, the temperature of which in an applied magnetic field changes with the field value and orientation relative to the rhombic axes of the crystal. Based on the analysis of the temperature and field dependences of the magnetization obtained at different orientations of the magnetic field, it has been established that, below Tc, an inclined magnetic structure is formed in the crystal. The antiferromagnetic vector of the inclined structure rotates smoothly in the rhombic bc plane with increasing temperature from a direction close to the b axis at T = 4.2 K and tends to the rhombic c axis at T = Tc. The rotation of the antiferromagnetic vector occurs also at fixed temperatures T < Tc with increasing magnetic field. In the temperature range of Tc < T < TN, the antiferromagnetic vector is oriented along the rhombic c axis. Magnetic phase diagrams of states have been built for different magnetic field orientations relative to the rhombic axes of the crystal. The richest phase diagram is shown to correspond to the orientation H||c and contains, along with the above-listed states, one more inclined phase, in which the antiferromagnetic vector rotates toward the rhombic a axis direction with a change in temperature or magnetic field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Kazak N. V., Nazarenko I. I., Sofronova S. N., Rostovtsev N. D., Bartolome J., Arauzo A., Ovchinnikov S. G.
Заглавие : Effect of magnetic frustrations on magnetism of the Fe3BO5 and Co3BO5 ludwigites
Место публикации : J. Magn. Magn. Mater. - 2019. - Vol. 474. - P.493-500. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2018.10.126
Примечания : Cited References: 33. - The Russian Foundation for Basic Research, Russia (project no. 17-02-00826-a ). S.G.O. thanks the Russian Academy of Science , Russia (project no. 0356-2017-0030 ) for financial support. J.B. and A.A. acknowledge the financial support of the Spanish MINECO-MAT2017-83468R project, Aragonese E-12 17R RASMIA (co-funded by Fondo Social Europeo), and the European Union (FEDER (ES)).
Ключевые слова (''Своб.индексиров.''): antiferromagnetics--superexchange interactions--frustrations
Аннотация: The magnetic structures of Fe3BO5 and Co3BO5 ludwigites have been studied experimentally by magnetic measurements and theoretically by the combination of the group theoretical analysis and semi empiric calculations of the superexchange interactions. The different collinear spin configurations in the triads 3-1-3 and 4-2-4 including ferromagnetic, antiferromagnetic and dimer have been considered. For Fe3BO5 the antiferromagnetic state with zero magnetic moment per unit cell, showing the lowest energy, results to be the most probable magnetic ground state. The unusual magnetic structure comprising two virtually independent orthogonal subsystems is formed to avoid heavy frustrations of superexchange interactions between the 3-1-3 and 4-2-4 spin ladders. In Co3BO5 the magnetic frustrations present for the Co3+ high-spin state are quenched for a Co3+ low spin state resulting in the ferrimagnetic long-range order. The obtained results are discussed in comparison with experimental magnetic data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chzhan A.V., Vasiliev A. D., Isaeva T. N., Patrin G. S.
Заглавие : Research of features magnetic permeability and domain structures in Fe 2O3:GA crystals near the morin transition
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Solid State Phenomena. - 2009. - Vol. 152-153. - С. 29-32. - ISSN 10120394 (ISSN); 390845168X (ISBN); 9783908451686 (ISBN), DOI 10.4028/www.scientific.net/SSP.152-153.29
Ключевые слова (''Своб.индексиров.''): antiferromagnetic--domain structure--hematite--morin transition--weakly ferromagnetic--antiferromagnetic materials--antiferromagnetism--capillarity--crystal impurities--crystals--ferromagnetic materials--ferromagnetic resonance--ferromagnetism--gallium--hematite--iron ores--magnetic permeability--oxide minerals--permanent magnets--antiferromagnetism--crystal impurities--ferromagnetic materials--ferromagnetism--gallium--hematite--iron compounds--magnetic materials--magnetic permeability--magnetism--afm--antiferromagnetic--antiferromagnetic domains--antiferromagnetics--basal planes--domain configurations--domain structure--morin transitions--multi-layered structure--weakly ferromagnetic--magnetic domains--magnetic domains
Аннотация: Specially picked up web-chamber is used for visualization of domain structure in hematite. An analysis of domain configuration shows, that domain structure of hematite in a basal plane represents multilayered structure which contains domains both in paralleled thickness and in the parallel basal planes. The temperature features of magnetic permeability and domain structures in Fe2O3:Ga crystals near the Morin transition are investigated. Observable changes of magnetic permeability and changes in domain structure confirm that transition from AFM to WFM occurs in the hematite with Ga impurity as transition of the first sort. Results of research of antiferromagnetic and weakly ferromagnetic resonances (AFMR and WFMR) in these compounds are presented.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : APLESNIN S. S.
Заглавие : MAGNETIC-PROPERTIES OF ANTIFERROMAGNETICS WITH FLUCTUATIONALLY INTERACTING PLANES
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 35, Is. 8. - P2105-2109. - ISSN 0367-3294
Примечания : Cited References: 5
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