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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Zharkov S. M., Zeer G. M., Gudim I. A.
Заглавие : Antiferromagnetic resonance and magnetic anisotropy in PrxY1−xFe3(BO3)4 crystals in the region of the magnetic structure transformation “easy axis – easy plane”
Место публикации : J. Alloys Compd. - 2022. - Vol. 909. - Ст.164821. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2022.164821
Примечания : Cited References: 37. - The authors acknowledge the assistance of R. Mironov in some resonance measurements. The SEM and EDS investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020–0011) of the Ministry of Science and Higher Education of the Russian Federation
Аннотация: The spin dynamics, magnetic structures and magnetic anisotropy of single crystals PrxY1−xFe3(BO3)4 have been studied using antiferromagnetic resonance (AFMR) in a wide range of frequencies, magnetic fields, and temperatures. The frequency-field dependences of AFMR for the crystals with x = 0.25 and 0.45 are characteristic of antiferromagnets with the easy plane (EP) anisotropy. The crystals with x = 0.75 and 1.0 exhibit frequency-field dependences that are typical for antiferromagnets with the easy axis (EA) anisotropy. In these crystals, a significant decrease in the effective anisotropy fields of praseodymium upon the transition to the spin-flop state has been found. It is shown that this is the main reason for the large lability intervals, within which the regions of coexistence of the collinear and spin-flop states overlap. In the crystal with x = 0.67, the magnetic field applied along the trigonal axis of the crystal leads to the spin reorientation transition from the EA to the EP state. A magnetic phase diagram of the states on the plane "magnetic field - temperature" is built. In this crystal, the effective anisotropy field of praseodymium also decreases upon the transition to the field-induced EP state. Diamagnetic dilution of the praseodymium subsystem leads to the contribution of this subsystem to the total anisotropy field depending almost linearly on the praseodymium concentration.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Petrakovskii G. A., Bezmaternykh L. N., Temerov V. L.
Заглавие : Antiferromagnetic resonance and magnetic anisotropy in single crystals of the YFe3(BO3)(4)-GdFe3(BO3)(4) system
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 50, Is. 1. - P79-83. - ISSN 1063-7834, DOI 10.1134/S1063783408010150
Примечания : Cited References: 16
Предметные рубрики: IRON BORATE GDFE3(BO3)(4)
ND3+
Аннотация: The antiferromagnetic resonance in single crystals of the YFe3(BO3)(4)-GdFe3(BO3)(4) system is studied in the frequency range 25-140 GHz and the temperature range 4.2-50.0 K. It is established that the YFe3(BO3)(4) crystal containing only the magnetic subsystem of Fe3+ ions is an antiferromagnet with an easy anisotropy plane. The temperature dependences of the gaps in the antiferromagnetic resonance spectra of GdFe3(BO3)(4) and YxGd1-xFe3(BO3)(4) are used to calculate the contributions of the Fe3+ and Gd3+ subsystems to the magnetic anisotropy of these crystals. The contributions are found to be close in magnitude and have opposite signs. This leads to a relatively weak uniaxial anisotropy field in the crystals under investigation. Since the exchange interaction between the Gd3+ and Fe3+ ions magnetizes the magnetic subsystem of gadolinium, both subsystems start to contribute simultaneously at the Neel temperature of the iron subsystem.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tugarinov V. I., Pankrats A. I., Kondyan S., Velikanov D. A., Temerov V. L.
Заглавие : Antiferromagnetic resonance and magnetic investigations of rare-earth ferroborates
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2011): Book of abstracts. - 2011. - Ст.24OR-O-10. - P.623
Примечания : Библиогр.: 3. - Work is supported by RFBR grant 10-02-00765
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Petrakovskii G. A., Bezmaternykh L. N., Bayukov O. A.
Заглавие : Antiferromagnetic resonance and phase diagrams of gadolinium ferroborate GdFe3(BO3)(4)
Разночтения заглавия :авие SCOPUS: Antiferromagnetic resonance and phase diagrams of gadolinium ferroborate GdFe3(BO3)4
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2004. - Vol. 99, Is. 4. - P766-775. - ISSN 1063-7761, DOI 10.1134/1.1826168
Примечания : Cited References: 16
Ключевые слова (''Своб.индексиров.''): anisotropy--antiferromagnetic materials--antiferromagnetism--phase diagrams--resonance--single crystals--antiferromagnetic resonance--antiferromagnets--crystal axis--transition fields--gadolinium compounds
Аннотация: Antiferromagnetic resonance in single crystals of rhombohedral gadolinium ferroborate GdFe3(BO3)(4) was studied. The frequency-field dependences of antiferromagnetic resonance over the frequency range 26-70 GHz and the temperature dependences of resonance parameters for magnetic fields oriented along the crystal axis and in the basal plane were determined. It was found that the iron subsystem, which can be treated as a two-sublattice antiferromagnet with anisotropy of the easy-plane type, experienced ordering at T = 38 K. At temperatures below 20 K, the gadolinium subsystem with the opposite anisotropy sign strongly influenced the anisotropic properties of the crystal. This resulted in a spontaneous spin-reorientation transition from the easy-plane to the easy-axis state at 10 K. Below 10 K, magnetic field-induced transitions between the states were observed. Experimental phase diagrams on the temperature-magnetic field plane were constructed for fields oriented along the crystal axis and in the basal plane. A simple model was used to calculate the critical transition fields. The results were in close agreement with the experimental values measured at T = 4.2 K for both field orientations. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Yaroslavtsev R. N., Ladygina V. P., Balaev D. A., Pankrats A. I., Iskhakov R. S.
Заглавие : Collective Spin Glass State in Nanoscale Particles of Ferrihydrite
Коллективы : International Symposium “Nanostructures: Physics and Technology”
Место публикации : Semiconductors. - 2020. - Vol. 54, Is. 12. - P.1710-1712. - DOI 10.1134/S1063782620120362
Примечания : Cited References: 16. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 19-42-240012 r_a “Magnetic resonance in ferrihydrite nanoparticles: Effects associated with the “core–shell” structure). This work was supported by a grant from the President of the Russian Federation for state support of young Russian scientists – candidates of sciences no. MK-1263.2020.3
Аннотация: Ferromagnetic resonance was used to study three types of ferrihydrite nanoparticles: nanoparticles formed as a result of the cultivation of microorganisms Klebsiella oxytoca; chemically prepared ferrihydrite nanoparticles; chemically prepared ferrihydrite nanoparticles doped with Cu. It is established from the ferromagnetic resonance data that the frequency-field dependence (in the temperature range ТP ‹ T ‹ T*) is described by the expression: 2πν/γ ⁼ НR + HA(T = 0)(1 – T/Т*), where γ is the gyromagnetic ratio, HR is the resonance field. The induced anisotropy HA is due to the spin-glass state of the near-surface regions. TP temperature characterizes the energy of the interparticle interaction of nanoparticles.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Balaev A. D., Freydman A. L., Vasiliev A. D., Balaev D. A.
Заглавие : Comparative study of the magnetic phase diagrams and spin-flop-driven magnetodielectric responses of the pure and Mn3+-doped Pb2Fe2Ge2O9 single crystals
Место публикации : J. Magn. Magn. Mater. - 2021. - Vol. 534. - Ст.168023. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2021.168023
Примечания : Cited References: 21. - 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. 18-42-240008 “Effect of the Magnetic Structure on the Magnetodielectric Properties of Oxide Crystals Containing Stereoactive Pb 2+ and Bi 3+ Ions”
Аннотация: The Pb2Fe2-xMnxGe2O9 (x = 0.43) orthorhombic antiferromagnet single crystals have been synthesized by a modified pseudo-flux technique and their magnetic and magnetodielectric properties have been investigated. It has been established that partial substitution of highly anisotropic Mn3+ ions for iron ones significantly affects the magnetic structure of the crystal. Under magnetization of the crystal along the rhombic b and c axes, magnetization jumps have been detected, which are indicative of the occurrence of orientational transitions identified as first-order ones. No weak ferromagnetism characteristic of the pure crystal in the rhombic a axis direction has been detected. The field dependences of the magnetization for the pure and Mn-doped crystals have been analyzed using the thermodynamic potential that takes into account the crystal symmetry. It has been shown that, in the Mn-substituted crystal, the antiferromagnetic vector in the ground state is parallel to the rhombic b axis; in this state, weak ferromagnetism has not been observed. Under magnetization along the b axis, a conventional spin-flop transition occurs. The orientational transition under magnetization along the c axis has been attributed to the reorientation of the antiferromagnetic vector relative to the a axis with the simultaneous occurrence of a weak ferromagnetic moment along the c axis. Magnetic phase diagrams of the Mn-doped crystal for the magnetic fields H||b and H||c have been built. In the Mn-doped crystal, at E||c and H||c, the orientational transition-induced magnetodielectric response jump has been detected, which is higher than the jumps observed for the undoped crystal by a factor of 3. The magnetodielectric properties of the pure and Mn-doped crystals have been analyzed using their magnetic phase diagrams.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ritter C., Pankrats A.I., Gudim, I. A., Vorotynov A.M.
Заглавие : Determination of the magnetic structure of SmFe3(BO3)4 by neutron diffraction: comparison with other RFe3(BO3)4 iron borates
Место публикации : J. Phys.: Condens. Matter: IOP Publishing Ltd, 2012. - Vol. 24, Is. 38. - Ст.386002. - ISSN 0953-8984, DOI 10.1088/0953-8984/24/38/386002
Примечания : Cited References: 40. - This work was supported by RFBR, grant No. 10-02-00765.
Предметные рубрики: SPIN REORIENTATION
EARTH
GDFE3(BO3)4
BEHAVIOR
Аннотация: Temperature dependent neutron diffraction studies were performed on SmFe3(BO3)4. The crystallographic structure was determined to stay as R32 over the whole studied temperature range of 2 K ‹ T ‹ 300 K. A magnetic phase transition characterized by the magnetic propagation vector κ = [0 0 3/2] takes place at TN = 34 K. The magnetic structure sees an easy-plane arrangement within the trigonal basal a–b-plane of ferromagnetic layers of iron and samarium having a canting angle of about 70° relative to each other. Neighbouring layers in the c-direction are antiferromagnetically coupled; at 2 K the magnetic moment values amount to μFe = 4.2(1) μB and μSm = 0.8(2) μB. The non-Brillouin type increase of the iron magnetic moment below TN points to a strong Fe–Sm exchange and to the simultaneous appearance of long range magnetic order on both sublattices.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Sablina K. A., Udod L. V., Pankrats A. I., Velikanov D. A., Bondarenko G. V., Szymczak R. , Baran M.
Заглавие : Effect of Ni-substitution on magnetic phase transition in CuB 2O4
Место публикации : Journal of Magnetism and Magnetic Materials: Elsevier Science Publishing Company, Inc., 2006. - Т. 300, № 1. - P.e476-e478. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2005.10.198
Примечания : Библиогр.: 10. - Грант РФФИ 03-02-16701
ГРНТИ : 45.09
Аннотация: The single crystals Cu1 xNixB2O4 with x ¼ 0:002; 0.005; 0.009; 0.014 were grown by spontaneous crystallization and the magnetic properties of these crystals have been studied. The strong influence of substitution on the value of critical fields H?c at which the modulated states transform into a weak ferromagnetic one was observed in the temperature range 9.5–20 K. The essential change of temperature dependence of a paramagnetic susceptibility w for Ni-doped samples in comparison with pure CuB2O4 was revealed. The modulated state was not observed in the temperature range 9.5–20 K for Ni content more than x ¼ 0:009.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sablina K. A., Udod L. V., Pankrats A. I., Velikanov D. A., Vasiliev A. D., Bovina A. F., Bondarenko G. V.
Заглавие : Effect of substitution on magnetic properties of CuB2O4
Место публикации : Moscow International Symposium on Magnetism, Moscow, 2008, p.687
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhashenok N. V., Pankrats A. I., Gudim I. A., Skorobogatov S. A., Molokeev M. S.
Заглавие : Effect of synthesis conditions on the magnetic properties of chromium borate single crystals
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.127
Примечания : Cited References: 5. - РФН № 22-12-20019 ; Красноярский регион. фонд науки
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