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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ovchinnikov S. G., Markov V. V., Kosyrev N. N., Seredkin V. A., Khudyakov A. E., Bondarenko G., Kesler V.
Заглавие : Room-temperature ferromagnetism in Dy films doped with Ni
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2008. - Vol. 403, Is. 18. - P3295-3301. - ISSN 0921-4526, DOI 10.1016/j.physb.2008.04.018
Примечания : Cited References: 25. - The work was supported partly by the Integration Project of SB RAS (# 3.5), Program "Spintronics" of the Department of Physical Sciences of RAS, and RFBR Grant no. 07-03-00320.
Предметные рубрики: METAL NANOSCALE MULTILAYERS
EARTH
MAGNETISM
SURFACE
Ключевые слова (''Своб.индексиров.''): dy--dy-ni bi-layer films--magnetic ordering--magnetic circular dichroism--magneto-optic kerr effect--auger spectroscopy--auger spectroscopy--dy--dy-ni bi-layer films--magnetic circular dichroism--magnetic ordering--magneto-optic kerr effect--magnetic fields--nickel--bi layer films--magnetic (ce)--magneto optical--room temperature (rt) ferromagnetism--spectral dependences--magnetic field effects
Аннотация: Temperature, magnetic field and spectral dependences of magneto-optical effects (MOEs) in bi-layer films Dy(1-x)Nix-Ni and Dy(1-x)(NiFe)(x)-NiFe were investigated, x changes from 0 to 0.06. Peculiar behavior of the MOEs was revealed at temperatures essentially exceeding the Curie temperature of bulk Dy which is explained by the magnetic ordering of the Dy layer containing Ni under the action of two factors: Ni impurities distributed homogeneously over the whole Dy layer and atomic contact of this layer with continues Ni layer. The mechanism of the magnetic ordering is suggested to be associated with the change of the density of states of the alloy Dy(1-x)Nix owing to hybridization with narrow peaks near the Fermi level character for Ni. (C) 2008 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kadomtseva A. M., Vorob'ev G. P., Popov Y. F., Pyatakov A. P., Mukhin A. A., Ivanov V. Y., Zvezdin A. K., Gudim, Irina A., Temerov V. L., Bezmaternykh L. N.
Заглавие : Magnetoelectric and magnetoelastic properties of easy-plane ferroborates with a small ionic radius
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2012. - Vol. 114, Is. 5. - P.810-817. - ISSN 1063-7761, DOI 10.1134/S1063776112030053
Примечания : Cited References: 26. - This work was supported by the Russian Foundation for Basic Research (project nos. 10-02-00846a, 09-02-01355, and 12-02-01261).
Предметные рубрики: EARTH
HoFe3(BO3)4
DyFe3(BO3)4
RFe3(BO3)4
Аннотация: The magnetic, magnetoelectric, and magnetoelastic properties of RFe3(BO3)4 ferroborates are studied. The measurement of the field dependences of the magnetoelectric polarization along the a axis in holmium ferroborate and in the mixed composition Ho0.5Sm0.5Fe3(BO3)4 revealed the following dependences for easy-plane ferroborates: (a) the longitudinal and transverse magnetoelectric effects have the opposite signs and (b) magnetically induced polarization changes its sign in a field close to the field of exchange between rare-earth and iron ions. These dependences agree well with theoretical predictions based on the symmetry of the compounds. The relatively low f-d exchange field in holmium ferroborate (about 20 kOe), which magnetizes the rare-earth subsystem, causes smaller polarization jumps (about 30 μC/m2) in fields lower than 10 kOe as compared to the jumps in other easy-plane ferroborates (R = Sm, Nd). The increase in the electric polarization induced in HoFe3(BO3)4 in magnetic fields higher than 100 kOe (200–300 μC/m2) is found to be significantly smaller than in neodymium ferroborate, which indicates a substantial dependence of the magnetoelectric effects on the electronic structure of a rare-earth ion.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dyakonov V. P., Szymczak R., Prokhorov A. D., Zubov E., Prokhorov A. A., Petrakovskii G. A., Bezmaternykh L. N., Berkowski M., Varyukhin V., Szymczak H.
Заглавие : Magnetic and EPR studies of the EuFe3(BO3)(4) single crystal
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic and EPR studies of the EuFe 3(BO 3) 4 single crystal
Место публикации : Eur. Phys. J. B: SPRINGER, 2010. - Vol. 78, Is. 3. - P291-298. - ISSN 1434-6028, DOI 10.1140/epjb/e2010-10059-3
Примечания : Cited References: 23. - A.A. Prokhorov is grateful to Mianowski Fund for financial support.
Предметные рубрики: EARTH
GDFE3(BO3)(4)
MULTIFERROICS
Ключевые слова (''Своб.индексиров.''): absorption lines--antiferromagnetic orderings--applied magnetic fields--basal planes--easy direction of magnetizations--electron paramagnetic resonance--epr measurements--epr spectra--epr studies--europium ions--exchange fields--g factors--lorentz--magnetic measurements--magnetic subsystems--orientation dependence--sub-lattices--temperature dependence--temperature range--trigonal symmetry--zeeman effect--antiferromagnetism--crystal orientation--europium--magnetic fields--magnetic moments--magnetic variables measurement--magnetization--paramagnetic resonance--paramagnetism--single crystals--spectroscopy--electron spin resonance spectroscopy
Аннотация: Magnetic and electron paramagnetic resonance (EPR) properties of EuFe3(BO3)(4) single crystals have been studied over the temperature range of 300-4.2 K and in a magnetic field up to 5 T. The temperature, field and orientation dependences of susceptibility, magnetization and EPR spectra are presented. An antiferromagnetic ordering of the Fe subsystem occurs at about 37 K. The easy direction of magnetization perpendicular to the c axis is determined by magnetic measurements. Below 10 K, we observe an increase of susceptibility connected with the polarization of the Eu sublattice by an effective exchange field of the ordered Fe magnetic subsystem. In a magnetic field perpendicular to the c axis, we have observed an increase of magnetization at T 10 K in the applied magnetic field, which can be attributed to the appearance of the magnetic moment induced by the magnetic field applied in the basal plane. According to EPR measurements, the distance between the maximum and minimum of derivative of absorption line of the Lorentz type is equal to 319 Gs. The anisotropy of g-factor and linewidth is due to the influence of crystalline field of trigonal symmetry. The peculiarities of temperature dependence of both intensity and linewidth are caused by the influence of excited states of europium ion (Eu3+). It is supposed that the difference between the g-factors from EPR and the magnetic measurements is caused by exchange interaction between rare earth and Fe subsystems via anomalous Zeeman effect.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Geng K., Xia, Zhiguo, Molokeev M. S.
Заглавие : Crystal structure and luminescence property of a novel blue-emitting Cs2xCa2xGd2(1−x)(PO4)2:Eu2+ (x = 0.36) phosphor
Место публикации : Dalton Trans.: Royal Society of Chemistry, 2014. - Vol. 43, Is. 37. - P.14092-14098. - ISSN 1477-9226, DOI 10.1039/c4dt01578a. - ISSN 1477-9234
Примечания : Cited References: 29. - This present work was supported by the National Natural Science Foundation of China (grant no. 51002146, no. 51272242), Natural Science Foundation of Beijing (2132050), the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-12-0950), the Fundamental Research Funds for the Central Universities (2011YYL131), Beijing Nova Program (Z131103000413047) and Beijing Youth Excellent Talent Program (YETP0635) and the Funds of the State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University (KF201306).
Предметные рубрики: ENERGY-TRANSFER
DIODES
EARTH
EU-2+
PHASE
IONS
Аннотация: A novel blue-emitting double-phosphate phosphor Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ was synthesized by the sol-gel method, and the structure and luminescence properties were investigated in detail. The crystal structure and chemical composition of Cs0.72Ca0.72Gd1.28(PO4)(2) matrix was analyzed and determined based on Rietveld refinements and phase and chemical composition analysis. The composition-optimized Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ exhibited strong blue light, peaking at 462 nm upon excitation at 365 nm with the CIE coordinates of (0.139, 0.091). The quenching concentration of Eu2+ in the Cs0.72Ca0.72Gd1.28(PO4)(2) phase was about 0.01 and attributed to the dipole-quadrupole interaction. The thermally stable luminescence properties, fluorescence decay curves and diffuse reflectance spectra of Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ phosphors are also discussed, all of which indicate that the Cs0.72Ca0.72Gd1.28(PO4)(2):Eu2+ phosphor is a promising phosphor for application in white-light UV LEDs.
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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) : Demidov A. A., Gudim, I. A., Eremin E. V.
Заглавие : Magnetic Properties of Sm0.7Ho0.3Fe3(BO3)4
Место публикации : J. Exp. Theor. Phys.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 115, Is. 5. - P.815-828. - ISSN 1063-7761, DOI 10.1134/S1063776112100020
Примечания : Cited References: 31
Предметные рубрики: SPIN REORIENTATION
EARTH
GDFE3(BO3)4
SMFE3(BO3)4
Аннотация: The magnetic properties of a ferroborate single crystal of substituted composition Sm0.7H0.3Fe3(BO3)4 with competing Sm-Fe and Ho-Fe exchange interactions are studied. The measured properties and effects are interpreted in terms of a general theoretical approach based on the molecular field approximation and calculations using the crystal field model for a rare-earth ion. The experimental temperature dependences of the initial magnetic susceptibility in the temperature range 2-300 K, the anomalies in the magnetization curves for B aEuro- c and B aSyen c in fields lower than 1.2 T, and the field and temperature dependences of magnetization in fields lower than 9 T are described. The crystal field parameters and the parameters of the R-Fe and Fe-Fe exchange interactions are determined during the interpretation of the experimental data.
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