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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babkin E. V., Koval K. P., Pynko V. G.
Заглавие : Magnetic crystallographic anisotropy of ferrimagnetic gamma-Fe2O3
Место публикации : Fiz. Tverd. Tela. - 1983. - Vol. 25, Is. 2. - P.585-587. - ISSN 0367-3294
Примечания : Cited References: 9
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : FISH G. I., KHRUSTALEV B. P., FROLOV G. I., YAKOVCHUK V. Y.
Заглавие : FERRIMAGNETIC RESONANCE IN DY-CO FILMS IN THE VICINITY OF SPIN-REORIENTATION TRANSITIONS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1986. - Vol. 28, Is. 7. - P2205-2207. - ISSN 0367-3294
Примечания : Cited References: 5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babkin E. V., Koval K. P., Pynko V. G.
Заглавие : Magnetic-properties of ferrimagnetic iron-oxide gamma-Fe2O3
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 100, Is. 2. - P.582-589. - ISSN 0044-4510
Примечания : Cited References: 10
Аннотация: The results of an investigation of the magnetic properties of iron oxide gamma-Fe2O3 are presented. Epitaxial crystallization on a magnesium oxide backing ensured the stability of the compound in a broad temperature range. The temperature dependences of the magnetization and magnetic anisotropy constants are measured. The magnetization of the sublattices and the single-ion anisotropy constants foh the Fe3+ ion are determined. A magnetic anisotropy induced by the growth of the film is observed, its nature being dependent on the crystallographic orientation of the backing. It is shown that the cause of the appearance of the anisotropy is the ordering of the cation vacancies during the growth of the film.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : KHRUSTALEV B. P., POZDNYAKOV V. G., FROLOV G. I.
Заглавие : HALL-EFFECT AND TRANSITION INTO THE NONCOLLINEAR STATE IN FERRIMAGNETIC AMORPHOUS DY-CO FILMS IN A STRONG MAGNETIC-FIELD
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1993. - Vol. 35, Is. 4. - P921-924. - ISSN 0367-3294
Примечания : Cited References: 7
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ivantsov R., Vasiliev A., Stepanov S., Kornilova E., Zarubina T.
Заглавие : Superparamagnetic and ferrimagnetic nanoparticles in glass matrix
Место публикации : Physica B. - 2001. - Vol. 301, Is. 3-4. - P.203-211. - ISSN 0921-4526, DOI 10.1016/S0921-4526(01)00274-5
Примечания : Cited References: 9
Предметные рубрики: MAGNETIC-PROPERTIES
PARTICLES
FILMS
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--faraday rotation--faraday rotation--magnetic nanoparticles--crystal structure--faraday effect--ferrimagnetic materials--glass--particle size analysis--superparamagnetism--x ray diffraction analysis--amorphous glass matrices--faraday rotations--nanostructured materials
Аннотация: Faraday rotation (FR) spectral, field, and temperature dependencies in oxide glasses with small additions of paramagnetic elements are investigated. Formation of ferrite nanoparticles in amorphous glass matrices is revealed by X-ray diffraction. Particles have crystal structure similar to spinel structure, their dimensions are about 10-24 nm. The FR field dependencies are typical for ferrimagnetic or superparamagnetic substances depending on particle size. Strong FR increase at the samples cooling (more than twice for some samples) in the temperature interval 105-273 K is observed. (C) 2001 Elsevier Science B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Shaihutdinov K. A., Popkov S. I., Petrov M. I.
Заглавие : The effect of ferrimagnetic ordering in insulating component of composites HTSC plus Yttrium Iron Garnet on its transport properties
Разночтения заглавия :авие SCOPUS: The effect of ferrimagnetic ordering in insulating component of composites HTSC + yttrium iron garnet on its transport properties
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2003. - Vol. 125, Is. 5. - P281-285. - ISSN 0038-1098, DOI 10.1016/S0038-1098(02)00602-6
Примечания : Cited References: 34
Предметные рубрики: SUPERCONDUCTOR
TRANSITION
CURRENTS
Ключевые слова (''Своб.индексиров.''): high-tc superconductors--heterojunctions--magnetically ordered materials--grain boundaries--heterojunctions--high-tc superconductors--magnetically ordered materials--grain boundaries--grain boundaries--heterojunctions--high temperature superconductors--transport properties--yttrium compounds--ferrimagnetic ordering--garnets
Аннотация: Composites Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 modeling random network superconductor-ferrimagnetic-superconductor have been prepared and their transport properties (temperature dependences of resistivity rho and critical current density j(c), current-voltage characteristics) have been studied. Below the superconducting transition temperature T-m the rho(T) dependences exhibit a kink at some temperature T-m. The crossover of current-voltage characteristics from ohmic-like behavior in range T-m/T-c to non-linear one below T-m is observed. Transport properties of the 'benchmark' composites Y3/4Lu1/4Ba2Cu3O7 + Y3Al5O12 are typical for network superconductor-insulator-superconductor Josephson junction. The behavior observed for Y3/4Lu1/4Ba2Cu3O7 + Y3Fe5O12 composites is attributed to peculiarities of supercurrent carriers tunnelling through ferrimagnetic barriers. (C) 2002 Elsevier Science Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kazak N. V., Ovchinnikov S. G., Abd-Elmeguid M. M., Ivanova N. B.
Заглавие : Electronic properties of Fe1-xVxBO3 at ambient conditions and at high pressure
Разночтения заглавия :авие SCOPUS: Electronic properties of Fe1-xVx-BO3 at ambient conditions and at high pressure
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Pressure Using Nuclear Probes (JUL 20-24, 2004, Cologne, GERMANY), Is. 11. - P.S795-S800. - ISSN 0953-8984, DOI 10.1088/0953-8984/17/11/008
Примечания : Cited References: 16
Предметные рубрики: FEBO3 SINGLE-CRYSTALS
SOLID-SOLUTIONS
BAND-STRUCTURE
TRANSITION
MOSSBAUER
MAGNETIZATION
MODEL
VBO3
Ключевые слова (''Своб.индексиров.''): electronic properties--ferrimagnetic materials--high pressure effects--high temperature superconductors--metal insulator transition--single crystals--superconductivity--thermal effects--carrier localization--correlation effects--critical pressure--semiconducting behavior--oxide superconductors
Аннотация: We present the results of an in-plane resistivity study of the solid solutions Fe1-xVxBO3. The measurements were made on single crystals with concentration x = 0.02, 0.13, 0.18, 0.3, 0.95, 1.0 in the temperature range 220-600 K. Semiconducting behaviour for samples with x = 0.13 was found. Mott variable-range-hopping transport rho(T) = rho(0)exp(T*/T)(alpha) has been observed with alpha = 1/4 at T 290 K, suggesting carrier localization. Above this temperature the activation-type conductivity, with activation energies, E-a, about 1 eV for all samples, is observed. The possible electronic states and band structure of Fe1-xVx BO3 crystals are discussed in the different pressure ranges: P P-c(Fe), p(c)(Fe) p p(c)(V) P P-c(V) where p(c)(Fe) P-c(V) are the critical pressure values for FeBO3 and VBO3, respectively.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Frolov G. I., Yakovchuk V. Y., Seredkin V. A., Iskhakov R. S., Stolyar S. V., Polyakov V. V.
Заглавие : Unidirectional anisotropy in ferromagnetic-ferrimagnetic film structures
Место публикации : Tech. Phys.: AMER INST PHYSICS, 2005. - Vol. 50, Is. 12. - P1605-1610. - ISSN 1063-7842, DOI 10.1134/1.2148562
Примечания : Cited References: 25
Предметные рубрики: BILAYERS
SENSORS
Аннотация: A mechanism of unidirectional anisotropy formation in an exchange-coupled ferromagnetic-ferrimagnetic film structure with orthogonal effective magnetizations in the layers is investigated. The reason for unidirectional anisotropy is the magnetic heterogeneity of the ferrimagnetic layer in the compensation range. Magnetization reversal in the magnetically soft layer of an (REE-transition metal)/NiFe film structure is discussed based on a model of uniform rotation of magnetization. It is found that unidirectional anisotropy sharply decreases the magnetic noise level in the magnetically soft layer. The field of application of these materials is outlined. (c) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popkov S. I., Balaev D. A., Shaihutdinov K. A., Petrov M. I.
Заглавие : Crossover from S-I-S to S-F-S junctions in composites Y3/4Lu1/4Ba2Cu3O7+Y-3(Al1-xFex)(5)O-12
Разночтения заглавия :авие SCOPUS: Crossover from S-I-S to S-F-S junctions in composites Y3/4Lu1/4Ba2Cu3O7 + Y3(Al1-xFex)5O12
Место публикации : Physica C: ELSEVIER SCIENCE BV, 2007. - Vol. 460: 8th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (JUL 09-14, 2006, Dresden, GERMANY). - P1311-1312. - ISSN 0921-4534, DOI 10.1016/j.physc.2007.03.348
Примечания : Cited References: 4
Ключевые слова (''Своб.индексиров.''): s-f-s structures--high-t-c superconductors--high-tc superconductors--s-f-s structures--ferrimagnetic materials--garnets--josephson junction devices--magnetization--transport properties--yttrium alloys--critical concentration--ferrimagnet junctions--magneto-active ions--super current carriers--high temperature superconductors
Аннотация: The transport properties of the two phases composites based on Y3/4Lu1/4Ba2Cu3O7 (YBCO) and Y-3(Al1-xFex)(5)O-12 (X = 0-0... 1.0) have been studied to investigate the effect of magnetic ordering in garnet on superconducting properties of the composites. The composites represent network of Josephson junctions where the non-superconducting ingredient (garnet) acts as barriers separating YBCO grains. It is found that magneto-active ions (Fe) in garnet are responsible for an additional suppression of Josephson coupling in the composites. At some critical concentration of Fe atoms full suppression of super current is observed in a temperature range from T-C of YBCO grains down to the characteristic temperature T,,,. This behavior is attributed to the interaction of super current carriers with spins of Fe atoms located in the barriers. The crossover from S-I-S (S-superconductor, I-insulator) to S-F-S (F-ferrimagnet) junctions is observed in the compdsites Y3/4Lu1/4Ba2Cu3O7 + Y-3(Al1-xFex)(5)O-12 with x increase. (c) 2007 Elsevier B.V. All rights reserved.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I., Kliava J.
Заглавие : Oxide glasses with magnetic nanoparticles: transparent magnets (Faraday rotation and electron magnetic resonance studies)
Коллективы : RFBR-CNRS [07-02-92174]
Разночтения заглавия :авие SCOPUS: Oxide glasses with magnetic nanoparticles: Transparent magnets (Faraday rotation and electron magnetic resonance studies)
Место публикации : Phys. Status Solidi B. - 2009. - Vol. 246, Is. 10. - P.2216-2231. - ISSN 0370-1972, DOI 10.1002/pssb.200945169
Примечания : Cited References: 87. - This work is supported in part by RFBR-CNRS joint project, grant No 07-02-92174. We are grateful to E. Petrakovskaja and O. Ivanova for measuring and discussing, respectively, the EMR spectra in thermally treated samples and the FR spectral and magnetic field dependences.
Предметные рубрики: SPIN-HAMILTONIAN PARAMETERS
SINGLE-DOMAIN PARTICLES
SUPERPARAMAGNETIC RESONANCE
CRYSTALLIZATION BEHAVIOR
FERRIMAGNETIC RESONANCE
PARAMAGNETIC-RESONANCE
TEMPERATURE-DEPENDENCE
COMPUTER-SIMULATIONS
FINE PARTICLES
BORATE GLASSES
Аннотация: In the first part of this paper we outline the state of the art in the field of magnetic nanoparticles in oxide glasses. We describe the theoretical background of two complementary techniques used for the studies of the state of paramagnetic ions, clusters and magnetic particles in a diamagnetic matrix, viz., magnetooptical Faraday rotation (FR) and electron magnetic resonance (EMIR) and we overview previous results obtained with these techniques for several glass systems. In the second part, we highlight the case of potassium-alumina-borate glasses - a glassy system where doping with paramagnetic oxides results in formation of magnetic particles at very low contents of paramagnetic additions: Fe(2)O(3) and MnO. In the special case when the ratio of the iron and manganese oxides in the charge is 3/2, magnetic nanoparticles with characteristics close to those of manganese ferrite are formed already at the first stage of the glass preparation. After thermal treatment all glasses show FR and EMR spectra attesting to the presence of superparamagnetic nanoparticles, characterized by relatively broad size and shape distributions. The formation of magnetic nanoparticles confers to these glasses magnetic and magnetooptical properties typical of magnetically ordered substances. At the same time, the glasses remain transparent in a part of the visible and near infrared spectral range and display a high FR value. Such properties make them particularly interesting for use as new media for various magneto-optical devices. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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