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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : AIZENBERG L. A., KRAVTSOV B. A.
Заглавие : CALCULATION EXPERIMENT ON THE HIGH-RESOLUTION OF PHYSICAL DEVICES BY THE EXTRAPOLATION OF THE FOURIER SPECTRUM OF UNIDIMENSIONAL FINITE SIGNALS
Место публикации : Pisma Zhurnal Tek. Fiz.: MEZHDUNARODNAYA KNIGA, 1987. - Vol. 13, Is. 19. - P1193-1197. - ISSN 0320-0116
Примечания : Cited References: 6
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Komogortsev S. V., Moroz Z. M., Shalygina E. E.
Заглавие : Characteristics of the magnetic microstructure of amorphous and nanocrystalline ferromagnets with a random anisotropy: Theoretical estimates and experiment
Место публикации : JETP Letters. - 2000. - Vol. 72, Is. 12. - P.603-607. - ISSN 0021-3640, DOI 10.1134/1.1351199
Примечания : Cited References: 22
Предметные рубрики: ALLOYS
Аннотация: An experimental determination (both direct and indirect) of the characteristics of the magnetic microstructure, namely, the ferromagnetic correlation radius R-f and the rms fluctuation of the mean anisotropy D-1/2H-a, is performed for amorphous and nanocrystalline ferromagnets with a random anisotropy characterized by the quantities R-c and (DHa)-H-1/2, respectively. The magnetization curves of amorphous and nanocrystalline ferromagnets are found to exhibit a dependence on H that is caused by the alignment of the magnetizations of individual magnetic blocks with the field. (C) 2000 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova E. A., Volkov D. V., Vasiliev A. N., Demidov A. A., Kolmakova N. P., Gudim I. A., Bezmaternykh L. N., Tristan N., Skourski Y., Buchner B., Hess C., Klingeler R.
Заглавие : Magnetization and specific heat of TbFe3(BO3)(4): Experiment and crystal-field calculations
Разночтения заглавия :авие SCOPUS: Magnetization and specific heat of Tb Fe3 (B O3) 4: Experiment and crystal-field calculations
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2007. - Vol. 75, Is. 22. - Ст.224413. - ISSN 1098-0121, DOI 10.1103/PhysRevB.75.224413
Примечания : Cited References: 22
Предметные рубрики: GDFE3(BO3)(4)
MAGNETOSTRICTION
Аннотация: We have studied the thermodynamic properties of single-crystalline TbFe3(BO3)(4). Magnetization measurements have been carried out as a function of magnetic field (up to 50 T) and temperature up to 350 K with the magnetic field both parallel and perpendicular to the trigonal c axis of the crystal. The specific heat has been measured in the temperature range 2-300 K with a magnetic field up to 9 T applied parallel to the c axis. The data indicate a structural phase transition at 192 K and antiferromagnetic spin ordering at T-N approximate to 40 K. A Schottky anomaly is present in the specific-heat data around 20 K, arising due to two low-lying energy levels of the Tb3+ ions being split by f-d coupling. Below T-N, magnetic fields parallel to the c axis drive a spin-flop phase transition, which is associated with a large magnetization jump. The highly anisotropic character of the magnetic susceptibility is ascribed mainly to the Ising-like behavior of the Tb3+ ions in the trigonal crystal field. We describe our results in the framework of a unified approach which is based on mean-field approximation and crystal-field calculations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S.V., Iskhakov R. S., Balaev A. D., Chekanova L. A., Denisova E. A., Eremin E. V., Smirnov S., Momot N.
Заглавие : Experimental and numerical investigations of the magnetization curves in the nanocomposites consisted of several ferromagnetic phases
Место публикации : TRENDS IN MAGNETISM. - 2011. - Vol. 168-169. - С. 369-372. - ISSN 10120394 (ISSN); 9783037850213 (ISBN), DOI 10.4028/www.scientific.net/SSP.168-169.369
Ключевые слова (''Своб.индексиров.''): approach to saturation--ferromagnetic correlations--magnetization curves--numerical experiment--two-phase nanomaterials--ferromagnetic materials--ferromagnetism--magnetic anisotropy--nanocomposites--nanostructured materials--anisotropy--ferromagnetic materials--ferromagnetism--magnetic anisotropy--magnetization--nanostructured materials--saturation magnetization--approach to saturation--ferromagnetic correlations--magnetization curves--numerical experiments--two-phase nanomaterials--ferromagnetic exchange--ferromagnetic phasis--magnetic anisotropy constant--numerical investigations--two phase--saturation magnetization--magnetism
Аннотация: The magnetization correlation function for two-phase one-dimentional chain of the ferromagnetic exchange-coupled nanoparticles with a random anisotropy was calculated. The dependence of the magnetic correlation radius and the average magnetic anisotropy constant on the intrinsic size of the phase inhomogeneity was founded. The data allows estimating the applicability limits of the analytical equations for the magnetization curves approaching saturation of two-phase ferromagnetic nanomaterials.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Orlov Yu.S., Ovchinnikov S. G., Dudnikov V. A., Fedorov A. S., Kuzubov A. A.
Заглавие : Structural properties and high temperature spin and electronic transitions in GdCoO[[d]]3[[/d]]: experiment and theory
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 200. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Atuchin V. V., Kesler V. G., Zaitsev A. I., Molokeev M. S., Kuzubov A. A., Ignatova N. Y.
Заглавие : Electronic structure of α-SrB4O7: Experiment and theory
Коллективы : Russian-French workshop on Nanosciences and Nanotechnologies, Российская академия наук, Сибирское отделение РАН, Институт неорганической химии им. А.В. Николаева Сибирского отделения РАН, Институт катализа им. Г.К. Борескова Сибирского отделения РАН, Институт физики полупроводников им. А.В. Ржанова Сибирского отделения РАН
Место публикации : The 7th Russian-French workshop on Nanosciences and Nanotechnologies: Program and abstract book/ ed. A. V. Okotrub. - Novosibirsk, 2013. - P.47. - ISBN 978-5-901688-29-8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Zaitsev A. I., Molokeev M. S., Aleksandrovsky A. S., Kuzubov A. A., Ignatova N. Y., Kesler V. G.
Заглавие : Electronic structure of α-SrB[[d]]4[[/d]]O[[d]]7[[/d]]: experiment and theory
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, no. 8. - Ст.085503. - DOI 10.1088/0953-8984/25/8/085503
Аннотация: The investigation of valence band structure and electronic parameters of constituent element core levels of α-SrB4O7 has been carried out with x-ray photoemission spectroscopy. Optical-quality crystal α-SrB4O7 has been grown by the Czochralski method. Detailed photoemission spectra of the element core levels have been recorded from the powder sample under excitation by nonmonochromatic Al Kα radiation (1486.6 eV). The band structure of α-SrB4O7 has been calculated by ab initio methods and compared to XPS measurements. It has been found that the band structure of α-SrB4O7 is weakly dependent on the Sr-related states.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Orlov Yu.S., Solovyov L. A., Dudnikov V. A., Fedorov A. S., Kuzubov A. A., Kazak N. V., Voronov V. N., Vereshchagin S. N., Shishkina N. N., Perov N. S., Lamonova K. V., Babkin R.Yu., Pashkevich Yu.G., Anshits A. G., Ovchinnikov S. G.
Заглавие : Structural properties and high-temperature spin and electronic transitions in GdCoO3: Experiment and theory
Место публикации : Phys. Rev. B: American Physical Society, 2013. - Vol. 88, Is. 23. - Ст.235105. - P. - ISSN 1098-0121, DOI 10.1103/PhysRevB.88.235105
Аннотация: We have investigated the x-ray diffraction (XRD) structure, magnetic susceptibility, and heat capacity of GdCoO3 in a wide temperature range. A model of phase separation of the low-spin (LS) and high-spin (HS) states has been proposed based on the analysis of XRD peak shape anomalies in the temperature range 200-800 K. From magnetic measurements we separated the HS Co3+ contribution and fitted it with the temperature-dependent spin gap. We found a smooth LS-HS crossover at T=800 K. The possible contribution of the intermediate spin (IS) state to the thermodynamics is excluded by the calculation IS-LS excitation energy within the modified crystal-field approach. In the two-phase model, with HS/LS probabilities calculated from the found spin gap and the LS and HS volumes calculated by the DFT-GGA method, we were able to reproduce the temperature dependence of the unit-cell volume and thermal expansion. Thus, we conclude that in GdCoO3 the main mechanism of the lattice expansion is not the conventional lattice anharmonicity, but the HS/LS fluctuations. The electronic structure has been calculated by the LDA+GTB method. At zero temperature, we have obtained the charge-transfer insulator with the charge gap Eg=0.5 eV. The thermal population of the HS term results in the in-gap band formation inside the insulator gap and smooth insulator-metal transition at TIMT=780 K. Heat-capacity measurements revealed a smooth maximum near the TIMT. © 2013 American Physical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bataleva, Yu. V., Palyanov, Yu. N., Sokol A. G., Borzdov, Yu. M., Bayukov O. A.
Заглавие : The role of rocks saturated with metallic iron in the formation of ferric carbonate-silicate melts: experimental modeling under PT-conditions of lithospheric mantle
Коллективы : Siberian Branch of the Russian Academy of Sciences [31], Russian Foundation for Basic Research [12-05-00740]
Место публикации : Russ. Geol. Geophys.: Elsevier Science, 2015. - Vol. 56, Is. 1-2. - P.143-154. - ISSN 1068, DOI 10.1016/j.rgg.2015.01.008. - ISSN 1878030X(eISSN)
Примечания : Cited References:68. - This work was supported by Integration project 31 from the Siberian Branch of the Russian Academy of Sciences and by grant 12-05-00740 from the Russian Foundation for Basic Research.
Предметные рубрики: OXYGEN FUGACITY
DIAMOND FORMATION
OXIDATION-STATE
EARTHS MANTLE
Ключевые слова (''Своб.индексиров.''): carbonate-silicate melt--graphite--co2 fluid--iron carbide--garnet--redox gradient--high-pressure experiment
Аннотация: Experimental modeling of the processes of formation of ferric carbonate-silicate melts through the carbonate-oxide-metal interaction is performed in the (Mg,Ca)CO3-SiO2-Al2O3-Fe0 system at 6.3 and 7.5 GPa and within 1150-1650 °C, using a multianvil high-pressure apparatus of “split-sphere” type (BARS). Two parallel reactions run in the subsolidus region (1150-1450 °C): decarbonation, producing pyrope-almandine (Fe# = 0.40-0.75) and CO2 fluid, and redox interaction between carbonate and Fe0, resulting in the crystallization of iron carbide in assemblage with magnesiowustite (Fe# = 0.75-0.85). It is shown that the reduction of carbonate or CO2 fluid by iron carbide and parallel redox interaction of magnesiowustite with CO2 produce graphite in assemblage with Fe3 + -containing magnesiowustite. In the temperature range of 1450-1650 °C, generation of carbonate-silicate melts coexisting with pyrope-almandine, magnesiowustite, magnetite, ferrospinel, and graphite takes place. The composition of the produced melts is as follows: SiO2 - 10-15 wt.%, X(FeO + Fe2O3) = 36-43 wt.%, and Fe3+/XFe - 0.18-0.23. These Fe3 + -enriched carbonate-silicate melts/fluids are saturated with carbon and are the medium of graphite crystallization. Oxide and silicate phases (almandine, ferrospinel, and magnetite) coexisting with graphite are also characterized by high Fe3+/XFe values. It has been established that Fe3 + -enriched carbonate-silicate melts can result from the interaction of Fe0-containing rocks with carbonated rocks. In the reduced mantle (with the presence of iron carbides or oxides), melts of this composition can be the source of carbon and the medium of graphite crystallization at once. After separation and ascent, these ferric carbonate-silicate melts can favor oxidizing metasomatism in the lithospheric mantle.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Abramova G. M., Boehm M., Schefer, Juerg, Piovano, Andrea, Mita Yoshimi, Sokolov V. V.
Заглавие : Neutron investigation of FeXMn1–XS under pressure
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.P3.6. - P.188. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 2
Ключевые слова (''Своб.индексиров.''): sulfides--pressure--magnetism--neutron experiment
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