Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Nazarenko I. I., Sofronova S. N.
Заглавие : Ni5GeB2O10 Magnetic Properties Theoretical Study
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.O1.1. - P.37. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 4
Ключевые слова (''Своб.индексиров.''): ludwigites--magnetic order--exchange interactions--ferrimagnetic
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sofronova S. N., Nazarenko I. I., Veligzhanin A. A., Seryotkin Yu. V.
Заглавие : Crystal structure and exchange interactions of Cu2MnBO5
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P1.27. - P.87. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 4
Ключевые слова (''Своб.индексиров.''): ludwigites--exchange interactions--single crystal--ferrimagnetic
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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) : 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) : 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 сборника (однотомник)
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Shabanov A. V., Vasiliev A. D.
Заглавие : Formation the ferrimagnetic-like structure under partial subtitution in the crystal PbMn1?xFexBO4 (x?0.1)
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст.B.P2. - P.167. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 2. - The reported study was funded by RFBR and the Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, to the research project no. 18-42-240008 ”Effect of magnetic structure on the magnetodielectric properties of oxide crystals containing stereoactive ions Pb2+ and Bi3+”
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popkov S. I., Krasikov A. A., Semenov S. V., Dubrovskii A. A., Yakushkin S. S., Kirillov V. L., Mart'yanov O. N., Balaev D. A.
Заглавие : General regularities and differences in the behavior of the dynamic magnetization switching of ferrimagnetic (CoFe2O4) and antiferromagnetic (NiO) nanoparticles
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk region; Krasnoyarsk Regional Foundation for Science [18-42-240012]
Место публикации : Phys. Solid State. - 2020. - Vol. 62, Is. 9. - P.1518-1524. - ISSN 1063-7834, DOI 10.1134/S1063783420090255. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 46. - This work was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk region, and the Krasnoyarsk Regional Foundation for Science, project no. 18-42-240012: "Magnetization switching of magnetic nanoparticles in strong pulsed magnetic fields is a new approach to studying the dynamic effects related to the processes of magnetization of magnetic nanoparticles"
Предметные рубрики: PARTICLE-SIZE
EXCHANGE-BIAS
TEMPERATURE
STATE
COERCIVITY
Аннотация: In antiferromagnetic (AFM) nanoparticles, an additional ferromagnetic phase forms and leads to the appearance in AFM nanoparticles of a noncompensated magnetic moment and the magnetic properties typical of common FM nanoparticles. In this work, to reveal the regularities and differences of the dynamic magnetization switching in FM and AFM nanoparticles, the typical representatives of such materials are studied: CoFe2O4 and NiO nanoparticles with average sizes 6 and 8 nm, respectively. The high fields of the irreversible behavior of the magnetizations of these samples determine the necessity of using strong pulsed fields (amplitude to 130 kOe) to eliminate the effect of the partial hysteresis loop when studying the dynamic magnetic hysteresis. For both types of the samples, coercive force HC at the dynamic magnetization switching is markedly higher than HC at quasi-static conditions. HC increases as the pulse duration τP decreases and the maximum applied field H0 increases. The dependence of HC on field variation rate dH/dt = H0/2τP is a unambiguous function for CoFe2O4 nanoparticles, and it is precisely such a behavior is expected from a system of single-domain FM nanoparticles. At the same time, for AFM NiO nanoparticles, the coercive force is no longer an unambiguous function of dH/dt, and the value of applied field H0 influences more substantially. Such a difference in the behaviors of FM and AFM nanoparticles is caused by the interaction of the FM subsystem and the AFM “core” inside AFM nanoparticles. This circumstance should be taken into account when developing the theory of dynamic hysteresis of the AFM nanoparticles and also to take into account their practical application.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pankrats A. I., Kolkov M. I., Balaev A. D., Shabanov A. V., Vasiliev A. D.
Заглавие : Forming a ferrimagnetic-like structure in the PbMn1−xFexBO4 (x ≈ 0.1) single crystal upon partial substitution
Место публикации : J. Magn. Magn. Mater. - 2020. - Vol. 497. - Ст.165997. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2019.165997
Примечания : Cited References: 25. - The authors are grateful to S. Nikitin for help in the specific heat measurements in a magnetic field and S. Martynov for fruitful discussions. This study was funded by RFBR and the Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science , to the research project no. 18-42-240008 “Effect of Magnetic Structure on the Magnetodielectric Properties of Oxide Crystals Containing Stereoactive Ions Pb 2+ and Bi 3+”.
Аннотация: The PbMn1−xFexBO4 (x ≈ 0.1) orthoborate single crystals have been grown for the first time by spontaneous crystallization and their magnetic and resonance properties and specific heat have been examined. It has been established that partial substitution of iron ions for manganese ones leads to an increase in the Curie temperature to 34.2 K from its value of 30.3 K in the unsubstituted crystal, enhances the magnetic anisotropy, and reduces the saturation magnetization. The magnetization drop is explained in the framework of the model of a ferrimagnetic-like structure, in which the magnetic moments of iron and manganese ions form ferromagnetic subsystems coupled by the antiferromagnetic exchange. It has been found that under magnetization along the rhombic b axis the magnetic moments switch stepwise to the magnetic field direction in a certain critical field. The spin-reorientation transition is the first-order one. This feature of the crystal magnetization does not allow the experimental ferromagnetic resonance frequency-field dependence for the rhombic b axis to be described using the calculation for a simple rhombic ferromagnet. It has been established that the increase in the magnetic anisotropy of the crystal upon substitution leads to an increase in the energy gap in the ferromagnetic resonance spectrum to 121.5 GHz at T = 4.2 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Nazarenko I. I.
Заглавие : Ludwigites: From natural mineral to modern solid solutions
Место публикации : Cryst. Res. Technol.: Wiley-VCH Verlag, 2017. - Vol. 52, Is. 4. - Ст.1600338. - ISSN 02321300 (ISSN), DOI 10.1002/crat.201600338
Примечания : Cited References: 60. - This study was supported by Russian Foundation for Basic Research (RFBR) and Government of Krasnoyarsk Territory according to the research project No. 17-42-240338.
Ключевые слова (''Своб.индексиров.''): ludwigites--ferrimagnetic--antiferromagnetic--spin-glass--oxyborates
Аннотация: Ludwigites is a type of oxyborates compounds with BO3 groups, which have low-dimensional elements: stairs, zigzag walls, tapes. Such structural features influence on the physical properties of the compounds and cause charge ordering, the existence of two magnetic subsystems, ordered at different temperatures in the perpendicular direction, the quasi-one-dimensional magnetism, spin-glass state. In this survey, we have summarized all known experimental and theoretical studies and analyzed the proposed by the authors mechanisms of phase transitions in the ludwigite structure oxyborates. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova E. A., Komogortsev S. V., Iskhakov R. S., Chekanova L. A., Kalinin Yu. E., Sitnikov A. V.
Заглавие : Spin-wave spectroscopy and magnetostructural studies of Co nanogranular composites
Коллективы : International Symposium on Physics of Materials
Место публикации : Acta Phys. Pol. A. - 2018. - Vol. 134: Proceedings of International Symposium on Physics of Materials (ISPMA 14), Is. 3. - P.623-626. - ISSN 0587-4246, DOI 10.12693/APhysPolA.134.623. - ISSN 1898-794X eISSN
Примечания : Cited References: 25. - This work was supported by RFBR grants nos. 16-03-00256, 16-03-00969.
Предметные рубрики: Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances
Spin-wave resonance
Magnetic anisotropy
Аннотация: Nanogranular Co-SiO2, and Co-CaF2 films are investigated using ferromagnetic resonance and magnetic measurements. The spectrum of standing spin-wave has been registered in the perpendicular experiment configuration for all types of films with the magnetic granules content above 52 vol.%. The dependences of resonance fields Hr of spin modes on the mode number squared Hr(n2) are non-linear. Such behavior is supposed to be the result of the fluctuations of magnetic parameters (the magnetization and the ferromagnetic exchange coupling) in nanocomposite films. A comparison between the magnetic properties of Co-SiO2 granular films and Co-CaF2 films is carried out. The surface anisotropy value Ks of Co-SiO2 films is evaluated from the surface resonance modes of spin-wave resonance spectra as 3.5×10-4s7×10-4 J/m2. The magnetic anisotropy of Co100-x(SiO2)x, Co100-x(CaF2)x films (34s and the surface magnetic anisotropy of films Ks are determined. It is found that surface anisotropy of granules is predominant.
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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Bezmaternykh L. N., Eremin E. V., Nazarenko I. I., Volkov N. V., Kartashev A. V., Moshkina E. M.
Заглавие : The superexchange interactions and magnetic ordering in low-dimentional ludwigite Ni5GeB2O10
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 401. - P.217-222. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2015.10.024
Примечания : Cited References: 23. - This study was supported by Russian Foundation for Basic Research (RFFI Siberia No. 15-42-04186). We thank S. Popkov, G. Yurkin for help on the magnetic measurements and M.S. Molokeev for help on the x-ray diffraction
Предметные рубрики: DIELECTRICS
EXCHANGE
CATION
Ключевые слова (''Своб.индексиров.''): ludwigites--magnetic order--heat capacity--exchange interactions--ferrimagnetic
Аннотация: The ludwigite Ni5Ge(BO5)2 belongs to a family of oxyborates which have low-dimensional subunits in the form of three-leg ladders unit structure. This material was studied by magnetic and thermodynamic measurements. Ni5Ge(BO5)2 does not show full long-range magnetic order, but one goes into a partial ordering or spin-glass state at 87 K. The superexchange interactions were calculated in the framework of a simple indirect coupling model. Different models of magnetic structure of Ni5Ge(BO5)2 and its unique magnetic behaviour was discussed. © 2015 Elsevier B.V.
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13.

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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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Platunov M. S., Kazak, N. V., Knyazev Yu. V., Bezmaternykh L. N., Rogalev A., Wilhelm F., Weschke E., Schierle E., Zubavichus Y. V.
Заглавие : Valence-specific magnetization of the ferrimagnetic oxyborate single crystals using soft and hard X-ray mag-netic circular dichroism under high magnetic fields
Коллективы : International Conference on Magnetism
Место публикации : 20th Int. Conf. on Magnetism (ICM-2015): book of abstracts. - 2015. - Ст.TU.H-P31
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bezmaternykh L. N., Kolesnikova E. M., Eremin E. V., Sofronova S. N., Volkov N. V., Molokeev M. S.
Заглавие : Magnetization pole reversal of ferrimagnetic ludwigites Mn3-xNixBO5
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2014. - Vol. 364. - P.55-59. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2014.04.031
Примечания : Cited References: 13. - The study was supported by the Siberian Branch of the Russian Academy of Sciencesintegration Projectnos.29and2.5.2
Ключевые слова (''Своб.индексиров.''): crystal growth--ferrimagnets--magnetization pole reversal
Аннотация: The conditions for the flux growth of new Mn-Ni oxyborates with the ludwigite structure are reported. Magnetic measurement data for the samples with nickel and manganese predominance are presented. Magnetization pole reversal of the ferrimagnetic phases is established and analyzed in the framework of a model comprising two antiferromagnetically interacting subsystems, each being ferrimagnetically ordered. В© 2014 Elsevier B.V.В статье сообщают об условиях раствор-расплавного роста нового Mn–Ni оксибората со структурой людвигита. Представлены данные об магнитных измерениях для образцов с преобладанием никеля и марганца. Точка изменения знака намагниченности ферримагнитных фаз установлена и проанализирована в рамках модели, включающей две антиферромагнитным образом взаимодействующих подсистемы, каждая из которых является ферримагнитноупорядоченной.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bezmaternykh L. N., Moshkina E. M., Eremin E. V., Molokeev M. S., Volkov N. V., Seryotkin Yu. V.
Заглавие : Spin-lattice coupling and peculiarities of magnetic behavior of ferrimagnetic ludwigites Mn0.52+M1.52+Mn3+BO5(M=Cu, Ni)
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: N. Perov, A. Semisalova: Trans Tech Publications Ltd, 2015. - Vol. 233-234: Achievements in Magnetism. - P.133-136. - ISSN 1662-9779, DOI 10.4028/www.scientific.net/SSP.233-234.133. - ISSN 978-3-03835-482-6
Примечания : Cited References: 7
Предметные рубрики: Achievements in magnetism
Ключевые слова (''Своб.индексиров.''): counter magnetization--spin-lattice coupling--ludwigites
Аннотация: Temperature-field and orientational magnetization dependences of single crystals were measured. Both samples demonstrate significant field-depending temperature hysteresis and low-temperature counter field magnetization. The correlation of orientational dependences of these effects and magnetic anisotropy is analyzed; the role of spin-lattice interactions is discussed.Измерены температурно-полевые и ориентационные зависимости намагниченности монокристаллов. Оба образца демонстрируют гистерезис температуры в зависимости от поля и существенную намагниченность, направленную против поля при низкой температуре. Анализируется корреляция ориентационных зависимостей этих эффектов и магнитной анизотропии; Обсуждается роль спин-решеточных взаимодействий.
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17.

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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18.

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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19.

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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20.

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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