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Каталог книг и брошюр библиотеки ИФ СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova E. A., Kuzovnikova L. A., Iskhakov R. S., Bukaemskiy A. A., Eremin E. V., Nemtsev I. V.
Заглавие : Effect of ball milling and dynamic compaction on magnetic properties of Al2O3/Co(P) composite particles
Коллективы : Russian Foundation of Basic Research [13-03-00476-a]
Место публикации : J. Appl. Phys.: American Institute of Physics, 2014. - Vol. 115, Is. 17. - Ст.17B530. - ISSN 0021-8979, DOI 10.1063/1.4869158. - ISSN 1089-7550
Примечания : Cited References: 18. - This work was partially supported by Russian Foundation of Basic Research 13-03-00476-a.
Предметные рубрики: MECHANOCHEMICAL SYNTHESIS
MECHANICAL-PROPERTIES
NANOCOMPOSITE POWDER
ALLOYS
NANOCRYSTALLINE
MICROSTRUCTURE
FERROMAGNETS
Аннотация: The evolution of the magnetic properties of composite Al2O3/Co(P) particles during ball milling and dynamic compaction is investigated. To prepare starting composite particles, the Al2O3 granules were coated with a Co95P5 shell by electroless plating. The magnetic and structural properties of the composite particles are characterized by scanning electron microscopy, X-ray diffraction, and the use of the Physical Property Measurement System. The use of composite core-shell particles as starting powder for mechanoactivation allows to decrease treatment duration to 1 h and to produce a more homogeneous bulk sample than in the case of the mixture of Co and Al2O3 powders. The magnetic properties of the milled composite particles are correlated with changes in the microstructure. Reduction in grain size of Co during milling leads to an increase of the volume fraction of superparamagnetic particles and to a decrease of the saturation magnetization. The local magnetic anisotropy field depends on the amount of hcp-Co phase in sample. The anisotropy field value decreases from 8.4 kOe to 3.8 kOe with an increase in milling duration up to 75 min. The regimes of dynamic compaction were selected so that the magnetic characteristics-saturation magnetization and coercive field-remained unchanged. (C) 2014 AIP Publishing LLC.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Komogortsev S. V., Balaev A. D., Gavriliuk A. A.
Заглавие : The manifestations of the two-dimensional magnetic correlations in the nanocrystalline ribbons Fe64CO21B15
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 374. - P.423-426. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2014.08.078. - ISSN 1873-4766
Примечания : Cited References: 42
Предметные рубрики: GRAIN-SIZE DEPENDENCE
RANDOM ANISOTROPY
AMORPHOUS-ALLOYS
COERCIVE FORCE
FERROMAGNETS
FILMS
SATURATION
Fe
MICROSTRUCTURE
EVOLUTION
Ключевые слова (''Своб.индексиров.''): magnetic correlations--nanoclystalline alloys--random magnetic anisotropy--coercivity
Аннотация: We report and discuss the grain size dependence of the coercivity and approach magnetization to saturation in the FeCoB ribbons. Instead of expected three-dimensional magnetic correlations for 20 mu m thick ribbon with grain size about 10 nm, the observed behavior could be attributed to the two-dimensional stochastic magnetic domains and two dimensional magnetization ripple. (C) 2014 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S., Zimin A. A., Filatov E. Y., Korenev S. V., Shubin Yu. V., Chizhik N. A., Yurkin G. Yu., Eremin E. V.
Заглавие : The exchange interaction effects on magnetic properties of the nanostructured CoPt particles
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 401. - P.236-241. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2015.10.041
Примечания : Cited References: 55. - The work has been partially supported by RFBR Grants 15-08-06673, 14-03-00411, 14-03-00129, 15-42-0417115 and it is partly performed in Siberian Federal University within the state contract of the Russian Federation Ministry of Education and Science for 2014-2016 (project number 1792)
Предметные рубрики: CLUSTER BEAM DEPOSITION
BULK MAGNETS
NANOCRYSTALLINE FERROMAGNETS
REMANENCE ENHANCEMENT
THIN-FILMS
COERCIVITY
MICROSTRUCTURE
NANOPARTICLES
IRON
SYSTEM
Аннотация: Various manifestations of the exchange interaction effects in magnetization curves of the CoPt nanostructured particles are demonstrated and discussed. The inter-grain exchange constant A in the sponge-like agglomerates of crystallites is estimated as A=(7±1) pJ/m from the approach magnetization to saturation curves that is in good agreement with A=(6.6±0.5) pJ/m obtained from Bloch T 3/2 law. The fractal dimensionality of the exchange coupled crystallite system in the porous media of the disordered CoPt alloy d=(2.60±0.18) was estimated from the approach magnetization to saturation curve. Coercive force decreases with temperature as Hc~T 3/2 which is assumed to be a consequence of the magnetic anisotropy energy reduction due to the thermal spin wave excitations in the investigated CoPt particles. © 2015 Elsevier B.V. All rightsreserved.Демонстрируются и обсуждаются различные проявления эффектов обменного взаимодействия в кривых намагниченности наноструктуированных частиц CoPt. Межзеренная обменная константа А в агломератах губчатой структуры кристаллитов оценивается как /A/=(7±1) pJ/m из кривых приближения намагниченности к насыщению, это значение находится в хорошем согласии с /A/=(6.6±0.5) pJ/m, полученным из закона /T/. /2 Блоха. Размерность фрактала обменно-соединенных кристаллических систем в пористой среды неупорядоченного сплава CoPt /d/=(2.60±0.18) оценивалась из кривых приближения намагниченности к насыщению. Коэрцитивная сила уменьшается с температурой по закону /H_c /~/T/. /2 , который, как предполагается, есть следствие уменьшения энергии магнитной анизотропии из-за теплового возбуждения спиновых волн в изучаемых частицах CoPt.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Zhigalov V. S., Bykova L. E., Zharkov S. M., Matsynin A. A., Volochaev M. N., Tambasov I. A., Bondarenko G. N.
Заглавие : Thermite synthesis and characterization of Co-ZrO2 ferromagnetic nanocomposite thin films
Место публикации : J. Alloys Compd.: Elsevier, 2016. - Vol. 665. - P.197-203. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2015.12.257
Примечания : Cited References: 56. - This study was partially supported by the Russian Foundation for Basic Research (grants ##15-02-00948, 14-03-00515), by the Council for Grants of the President of the Russian Federation (SP-317.2015.1), and by the program of the Foundation for Assistance to Small Innovative Enterprises in Science and Technology (“UMNIK” program). The TEM studies were carried out using the facilities of Electron Microscopy Laboratory of Siberian Federal University and the Performance Service at Krasnoyarsk Scientific Center.
Предметные рубрики: SOLID-STATE SYNTHESIS
PHASE-FORMATION
ZrO2
NANOPARTICLES
TRANSPORT
OXIDE
MICROSTRUCTURE
NANOTHERMITE
FABRICATION
PARTICLES
Ключевые слова (''Своб.индексиров.''): thermite reactions--reactive films--ferromagnetic nanocomposite films--zro2
Аннотация: Co-ZrO2 ferromagnetic nanocomposite thin films were successfully synthesized using a new thermite reaction between Zr and Co3O4 in layer geometry. The initial Zr/Co3O4 bilayers were obtained by the deposition of Zr layers onto Co3O4 films at room temperature. The process of mixing at the Zr/Co3O4 interface and synthesis of fine-crystalline Co and amorphous ZrO2 phases started at a temperature above the initiation temperature Tin ∼250 °C which did not depend on the bilayer thickness. For the bilayer thickness more than 300 nm high-temperature fcc-Co and cubic c-ZrO2 (or tetragonal t-ZrO2) phases were formed. For the bilayer thickness less than ∼50 nm stable low-temperature hexagonal hcp-Co and monoclinic m-ZrO2 phases were also present in the reaction product. A partial transformation from Co3O4 to CoO occurred after annealing at 300 °C. The secondary reaction between CoO and Zr started soon after Co3O4 had been converted to the CoO phase. After annealing at 500 °C more than 80% of Co was reduced and the final product contained Co nanoparticles above and below the superparamagnetic critical size embedded into a dielectric ZrO2 matrix. The synthesized Co-ZrO2 nanocomposite films possessed soft magnetic behavior, high magnetization and good chemical stability.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrov M. I., Balaev D. A., Belozerova I. L., Vasil'ev A. D., Gokhfel'd D. M., Mart'yanov O. N., Popkov S. I., Shaihutdinov K. A.
Заглавие : Highly textured bismuth-containing high-temperature superconductor ceramics obtained by uniaxial pressing in liquid medium: Fabrication and properties
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 33, Is. 9. - P740-743. - ISSN 1063-7850, DOI 10.1134/S1063785007090088
Примечания : Cited References: 12
Предметные рубрики: MICROSTRUCTURE
MAGNETIZATION
Аннотация: A new method of fabricating textured ceramics with a composition of Bi1.8Pb0.3Sr1.9Ca2Cu3Ox is described, according to which the initial low-density ceramics is subjected to uniaxial pressing in a liquid medium followed by drying and annealing. Analysis of the X-ray diffraction and scanning electron microscopy data show evidence for a high degree of texture in high-temperature superconductor ceramics fabricated using the proposed method. The results of magnetic measurements indicate that the obtained material possesses anisotropy of the magnetic moment for the magnetic field H oriented parallel and perpendicular to the direction of uniaxial pressing. The textured ceramics also show high diamagnetic response for H parallel to the c axis of grains, which makes these ceramics promising materials for practical applications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Iskhakov R. S.
Заглавие : Magnetization curve and magnetic correlations in a nanochain of ferromagnetic grains with random anisotropy
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 3. - P495-501. - ISSN 1063-7834, DOI 10.1134/1.1884711
Примечания : Cited References: 31
Предметные рубрики: NANOCRYSTALLINE FERROMAGNETS
AMORPHOUS FERROMAGNETS
FIELD
MODEL
MICROSTRUCTURE
SIMULATIONS
DEPENDENCE
SYMMETRY
SYSTEM
MEDIA
Аннотация: The magnetization curve and magnetization correlation function are calculated for a ferromagnetic chain of single-domain nanoparticles with a randomly oriented anisotropy axis for different ratios between the exchange correlation and anisotropy energies. It is shown that the coercive force decreases as the exchange correlations increase. For strong exchange correlations, the magnetization curve is described by the following three successive magnetization processes as the applied field is increased: (i) nonuniform rotation of the magnetization of stochastic domains, (ii) collapse of the magnetic solitons, and (iii) nonuniform rotation of exchange-correlated magnetization vectors of the nanoparticles. For high fields, the calculated correlation function of the transverse magnetization components coincides with that predicted from linear theory. At low and zero fields, the main parameters of the correlation function (the variance and correlation radius) tend to certain finite values rather than diverge (as is the case in linear theory). The irreversible variation in the magnetization at low fields (the hysteresis loop) and the hysteresis of the main parameters of the correlation function are calculated. (c) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kveglis L. I., Jarkov S. M., Staroverova I. V.
Заглавие : Structural self-organization and the formation of perpendicular magnetic anisotropy in Co50Pd50 nanocrystalline films
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2001. - Vol. 43, Is. 8. - P1543-1548. - ISSN 1063-7834, DOI 10.1134/1.1395099
Примечания : Cited References: 22
Предметные рубрики: METAL THIN-FILMS
MICROSTRUCTURE
Аннотация: The correlation of the atomic-order structure and the energy density of perpendicular magnetic anisotropy in Co50Pd50 films is investigated. Structural models for nanocrystalline Co50Pd50 films are proposed. It is shown that processes of structural self-organization in the films form nontrivial atomic-order structures. These structures can exist owing to high elastic stresses, which apparently ensure the emergence of strong magnetic anisotropy (K-perpendicular to similar to 10(6) erg/cm(3)). (C) 2001 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Prus A. G., Shaikhutdinov K. A., Petrov M. I.
Заглавие : Angular dependence of the magnetoresistance in Y3/4Lu1/4Ba2Cu3O7-CuO composites at 77 K
Разночтения заглавия :авие SCOPUS: Angular dependence of the magnetoresistance in Y3/4Lu 1/4Ba2Cu3O7-CuO composites at 77 K
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 32, Is. 8. - P677-679. - ISSN 1063-7850, DOI 10.1134/S1063785006080128
Примечания : Cited References: 16
Предметные рубрики: CERAMIC SUPERCONDUCTORS
MAGNETIC-FIELD
MICROSTRUCTURE
BOUNDARIES
TRANSPORT
MOTION
FILMS
Аннотация: The angular dependence of the magnetoresistance of polycrystalline Y3/4Lu1/4Ba2Cu3O7-CuO composites has been studied. These composites represent a system of Josephson junctions and exhibit a large magnetoresistance at 77 K. In addition to the isotropic component, there is the angle-dependent component proportional to sin(2)theta, where theta is the angle between the directions of current and magnetic field. This behavior is unambiguous evidence for the process of flux flow in the Josephson medium realized in the composites.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Mikhlin Y. N., Bykova L. E., Mal'tsev V. K., Bondarenko G. N.
Заглавие : Long-Range Chemical Interaction in Solid-State Synthesis: The Formation of a CuAu Alloy in Au/beta-Co(001)/Cu(001) Epitaxial Film Structures
Коллективы : Russian Foundation for Basic Research [07-03-00190]; Ministry of Education and Science of the Russian Federation
Разночтения заглавия :авие SCOPUS: Long-range chemical interaction in solid-state synthesis: The formation of a CuAu alloy in Au/β-Co(001)/Cu(001) epitaxial film structures
Место публикации : JETP Letters. - 2009. - Vol. 90, Is. 2. - P.111-115. - ISSN 0021-3640, DOI 10.1134/S0021364009140069
Примечания : Cited References: 25. - This work was supported by Russian Foundation for Basic Research ( project no. 07-03-00190) and the Ministry of Education and Science of the Russian Federation ( program "Development of the Scientific Potential of Higher Education").
Предметные рубрики: THIN-FILMS
PHASE-TRANSITION
DIFFUSION
MICROSTRUCTURE
INTERLAYER
INTERFACE
COSI2
AU
Аннотация: The effect of an inert Co layer (0, 210, 480 nm) on the chemical interaction between Cu and Au in Au/beta-Co(001)/Cu(001) epitaxial films has been investigated by X-ray diffraction, nuclear magnetic resonance, photoelectron spectroscopy, and magnetic structure measurements. Mixing at interfaces in Cu/beta-Co(001) and Au/beta-Co(001) bilayer films has not been revealed up to a temperature of 600 C. The solid-state synthesis of ordered CuAu| and CuAu|| phases occurs through the Co inert buffer layer in Au/beta-Co(001)/Cu(001) trilayer film systems with an increase in the annealing temperature. The initiation temperatures of the CuAu| and CuAu|| phases increase only slightly with the thickness of the Co buffer layer. The assumption of the long range of the chemical interaction between Cu and Au through the chemically inert Co layer is justified using the performed investigations.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shaikhutdinov K. A., Balaev D. A., Popkov S. I., Petrov M. I.
Заглавие : Mechanism of Formation of a Negative Magnetoresistance Region in Granular High-Temperature Superconductors
Коллективы : Russian Academy of Sciences [3.4]; Russian Science Support Foundation
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 6. - P1105-1109. - ISSN 1063-7834, DOI 10.1134/S106378340906002X
Примечания : Cited References: 18. - This study was supported by the Russian Academy of Sciences within the program no. 3.4 (Quantum Macrophysics) and the complex integration program of the Siberian Branch of the Russian Academy of Sciences (program no. 3.4). One of the authors (D. A. B.) is grateful to the Russian Science Support Foundation.
Предметные рубрики: MAGNETIC-FIELD
CRITICAL-STATE
YBA2CU3O7-DELTA
HYSTERESIS
MICROSTRUCTURE
COMPOSITES
RESISTANCE
FLUX
Аннотация: The field dependences of the magnetoresistance of Bi(1.8)Pb(0.3)Sr(1.9)Ca(2)Cu(3)O(x) samples with different densities, which have a foam microstructure and exhibit different diamagnetic responses, were studied at 77.4 K to identify the mechanism responsible for the formation of a negative magnetoresistance region in granular high-temperature superconductors. A region with negative magnetoresistance was found to exist in samples with magnetizations highest in absolute magnitude. This behavior finds a reasonable interpretation as due to the effect exerted by dipole moments of high-temperature superconductor grains on the effective intergranular field. The strength of this effective field has been estimated.
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