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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Chekanova L. A., Denisova E. A.
Заглавие : Width of the ferromagnetic resonance line in highly dispersed powders of crystalline and amorphous Co-P alloys
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1999. - Vol. 41, Is. 3. - P416-419. - ISSN 1063-7834, DOI 10.1134/1.1130794
Примечания : Cited References: 12
Предметные рубрики:
Аннотация: The resonance characteristics (inhomogeneous FMR linewidth Delta H) in highly dispersed (d=0.1-3 mu m) powders of crystalline and amorphous Co-P alloys are investigated as a function of the composition, particle size, and atomic structure. It is established that Delta H for powders of amorphous Co-P alloys is two to three times larger than Delta H for crystalline Co-P powders. According to the investigations performed, this is caused by thermodynamically stimulated segregation of nonmagnetic Co2P inclusions, apparently an effective relaxation channel, in the amorphous state of Co-P powders. (C) 1999 American Institute of Physics. [S1063-7834(99)01903-6].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Kuzovnikova L. A., Komogortsev S. V., Denisova E. A., Balaev A. D., Mal'tsev V. K., Bondarenko G. N.
Заглавие : Accelerated mechanical alloying of mutually insoluble metals: Co-Cu system
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2004. - Vol. 30, Is. 1. - P60-63. - ISSN 1063-7850, DOI 10.1134/1.1646717
Примечания : Cited References: 11
Предметные рубрики: SOLID-SOLUTIONS
P ALLOYS
POWDERS
Аннотация: We propose a new method for accelerating the process of mechanical alloying in the Co-Cu system possessing positive enthalpy of mixing and exhibiting no mutual solubility of components under equilibrium conditions. For this purpose, highly disperse powders of composite particles representing a Co-P amorphous alloy core covered with a nanocrystalline copper shell were prepared by chemical deposition. These composite powders were mechanically alloyed by processing in a ball mill. Investigation of the atomic structure and magnetic properties of the composite powders upon milling showed that the formation of supersaturated Co-Cu solid solutions under such conditions requires a much shorter milling time as compared to that for the conventional mechanical alloying processes. (C) 2004 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavriliuk A. G., Trojan I. A., Lyubutin I. S., Ovchinnikov S. G., Sarkissian V. A.
Заглавие : High-pressure magnetic properties and P-T phase diagram of iron borate
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 2005. - Vol. 100, Is. 4. - P688-696. - ISSN 1063-7761, DOI 10.1134/1.1926429
Примечания : Cited References: 24
Предметные рубрики: FEBO3 SINGLE-CRYSTALS
NUCLEAR-RESONANCE
BAND-STRUCTURE
TRANSITION
TEMPERATURE
SCATTERING
Ключевые слова (''Своб.индексиров.''): antiferromagnetic materials--diamonds--ferromagnetic materials--high pressure effects--low temperature effects--magnetic moments--magnetic properties--magnetization--phase diagrams--powders--single crystals--synchrotron radiation--diamond anvil cells--electronic transition--iron borate--nuclear forward scattering (nfs)--iron compounds
Аннотация: The high-pressure magnetic states of iron borate (FeBO3)-Fe-57 single-crystal and powder samples have been investigated in diamond anvil cells by nuclear forward scattering (NFS) of synchrotron radiation at different temperatures. In the low-pressure (0 < P < 46 GPa) antiferromagnetic phase, an increase of the Neel temperature from 350 to 595 K induced by pressure was found. At pressures 46-49 GPa, a transition from the antiferromagnetic to a new magnetic state with a weak magnetic moment (magnetic collapse) was discovered. It is attributed to the electronic transition in Fe3+ ions from the high-spin 3d(5) (S = 5/2, (6)A(1g)) to the low-spin (S = 1/2, T-2(2g)) state (spin crossover) due to the insulator-semiconductor-type transition with extensive suppression of strong d-d electron correlations. At low temperatures, NFS spectra of the high-pressure phase indicate magnetic correlations in the low-spin system with a magnetic ordering temperature of about 50 K. A tentative magnetic P-T phase diagram of FeBO3 is proposed. An important feature of this diagram is the presence of two triple points where magnetic and paramagnetic phases of the high-spin and low-spin states coexist. © 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Sablina K. A., Eremin E. V., Boni P., Shah V. R., Flerov I. N., Kartashev A., Rasch JCE, Boehm M., Schefer J.
Заглавие : Heat capacity of a mixed-valence manganese oxide Pb(3)Mn(7)O(15)
Коллективы :
Разночтения заглавия :авие SCOPUS: Heat capacity of a mixed-valence manganese oxide Pb3Mn 7O15
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2008. - Vol. 20, Is. 44. - Ст.445214. - ISSN 0953-8984, DOI 10.1088/0953-8984/20/44/445214
Примечания : Cited References: 11. - This study was supported by the INTAS (project No 061000013-9002), the Division of Physical Sciences of RAS, program `Spin-dependent Effects in Solids and Spintronics' (project No. 2.4.2 of SB RAS), the President of the Russian Federation, grant for Support of Leading Scientific Schools (project No. NSh-1011.2008.2), KRSF-RFBR `Enisey2007', project No. 07-02-96801-a, and the Siberian Branch of RAS, Integration project No. 3.7.
Ключевые слова (''Своб.индексиров.''): antiferromagnetism--crystallography--entropy--lead alloys--magnetic materials--magnetism--manganese--manganese compounds--powders--single crystals--specific heat--spin dynamics--antiferromagnetic orders--charge localizations--entropy losses--excess heat capacities--experimental datums--heat capacities--magnetic contributions--magnetic orders--magnetic states--magnetic subsystems--magnetic transitions--manganese oxides--nonmagnetic--spin systems--temperature curves--temperature dependences--temperature intervals--temperature ranges--manganese alloys
Аннотация: We present the results of a heat capacity study of Pb(3)Mn(7)O(15) single crystals with approximately equal concentrations of Mn(3+) and Mn(4+) ions. In the temperature interval between 210 and 260 K, an excess heat capacity of nonmagnetic origin, most likely associated with the process of charge localization, has been observed. Also, three pronounced anomalies corresponding to the changes in a magnetic subsystem of the crystal have been observed in the temperature dependence of the heat capacity. A broad hump near 150 K is related to the formation of a short-range magnetic order. This process of short-range ordering is rather prominent, considering the appreciable value of the entropy loss accompanying the change in the magnetic state. A clear lambda-shaped peak at 70 K marks the onset of a long-range antiferromagnetic order. Another anomalous contribution to the heat capacity of magnetic origin has been revealed at temperatures below 20 K. This contribution is associated with a magnetic transition of an unknown nature, which is also clearly evident in magnetization versus temperature curves. The total magnetic contribution to the entropy deduced from the actual experimental data over the entire temperature range is much smaller than is expected for a completely ordered Mn spin system in the crystal. We suggest several possible reasons that may account for this `missing' entropy.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Chekanova L. A., Denisova E. A., Iskhakov R. S., Bayukov O. A.
Заглавие : Magnetic properties of Fe-based nanostructural powders
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2008): June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст.22PO-8-47. - p.300
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrakovskaya E. A., Isakova V. G., Velikanov D. A., Isakov V.
Заглавие : Electron Magnetic Resonance in nanoparticles of 3-d and 5-d metals formation in nanocarbon powders
Коллективы : "Магнитный резонанс для будущего", Международный конгресс, "Euromar", International Conference
Место публикации : EUROMAR 2008 Conference: St.Peterbsburg, 2008, [6-11 July]. - 2008. - p224
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Loiko V. A., Maschke U., Zyryanov V. Y., Konkolovich A. V., Misckevich A. A.
Заглавие : Small-Angle Light Scattering from Polymer-Dispersed Liquid-Crystal Films
Разночтения заглавия :авие SCOPUS: Small-angle light scattering from polymer-dispersed liquid-crystal films
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 107, Is. 4. - P692-698. - ISSN 1063-7761, DOI 10.1134/S1063776108100178
Примечания : Cited References: 20
Предметные рубрики: NEMATIC DROPLETS
Ключевые слова (''Своб.индексиров.''): abs resins--angular distribution--drop formation--drops--light--light scattering--phase transitions--plastic films--polymer films--polymers--polynomial approximation--powders--angle light scatterings--anomalous diffractions--crystal films--cylindrical symmetries--droplet sizes--induced phase transitions--optical wavelengths--pdlc films--scattered lights--scattering approximations--single layers--liquid crystal polymers
Аннотация: A method is developed for modeling and computing the angular distribution of light scattered forward from a single-layer polymer-dispersed liquid-crystal (PDLC) film. The method is based on effective-medium approximation, anomalous diffraction approximation, and far-field single-scattering approximation. The angular distribution of forward-scattered light is analyzed for PDLC films with droplet size larger than the optical wavelength. The method can be used to study field- and temperature-induced phase transitions in LC droplets with cylindrical symmetry by measuring polarized scattered light intensity.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Prishchepa O. O., Parshin A. M., Shabanov A. V., Zyryanov V. Ya.
Заглавие : Magneto-optical study of Friedericksz threshold in polymer dispersed nematic liquid crystals
Коллективы : International Topical Meeting on Optics of Liquid Crystals
Место публикации : Mol. Cryst. Liquid Cryst. - 2008. - Vol. 488, Is. 1. - P.309-316. - ISSN 1542-1406, DOI 10.1080/15421400802241167
Примечания : Cited Reference Count: 11
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): friedericksz threshold--nematic--magneto-optics--polymer dispersed liquid crystals--surface anchoring--friedericksz threshold--magneto-optics--nematic--polymer dispersed liquid crystals--surface anchoring--computer systems--crystallography--drop formation--drops--fluid mechanics--light sources--liquid crystals--magnetos--optical engineering--powders--approximate formulas--calculation data--computer modelling--friedericksz threshold--magneto-optical--magneto-optics--measured values--nematic--nematic droplets--poly vinyl butyral--polymer dispersed liquid crystals--reorientation processes--surface anchoring--threshold fields--nematic liquid crystals
Аннотация: A computer model of reorientation processes in the bipolar nematic droplets of ellipsoidal form with strong tangential anchoring has been developed. The approximate formula to estimate the Friedericksz threshold has been obtained when the operating field (electric or magnetic) is orthogonal to the bipolar axis. The dependence of the threshold field on the droplet form has been considered. The reorientation of the bipolar droplets of 5CB nematic liquid crystal dispersed in polyvinylbutyral has been studied by the magneto-optical method. The calculation data are in good agreement with measured values of the threshold field.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Zaitsev A. I., Shakhura I. E. , Zamkov A. V., Vyunishev A. M.
Заглавие : Random quasi-phase-matching in a nonlinear photonic crystal structure of strontium tetraborate
Место публикации : Phys. Rev. A. - 2008. - Vol. 78, Is. 3. - Ст.031802. - ISSN 1050-2947, DOI 10.1103/PhysRevA.78.031802
Примечания : Cited Reference Count: 20. - Гранты: This work was supported by RFBR Grant No. 02-0700497, Grants of the President of the Russian Federation for the support of leading scientific schools (No. SS-1011.2008.2 and No. SS-3818.2008.3), Grant No. RNP.2.1.1.1814, and the Interdisciplinary Integration project of SB RAS 33.Финансирующая организация: RFBR [02-0700497]; Russian Federation [SS-1011.2008.2, SS-3818.2008.3, RNP.2.1.1.1814]; SB RAS 33
Предметные рубрики: HARMONIC-GENERATION
DOMAIN-STRUCTURE
Ключевые слова (''Своб.индексиров.''): alkaline earth metals--crystal atomic structure--experiments--harmonic generation--photonic crystals--powders--random processes--strontium--angular dependences--enhancement factors--near ultraviolet--photonic crystal structures--quasi phase-matching--second-harmonic generation--spectral dependences--tetra borate--crystal structure
Аннотация: Random quasi-phase-matching (RQPM) of the second-harmonic generation process is investigated experimentally and theoretically in a strongly randomized spontaneously grown nonlinear photonic crystal structure of strontium tetraborate. The thickness of domains in the structure is measured and employed in calculations of angular and spectral dependences of random quasi-phase-matching. Despite the great scale of randomness, the RQPM effect is preserved. The calculated enhancement factor due to RQPM is in excellent agreement with experiment, and good agreement between calculations and experiment is obtained for the shape of the angular dependence of RQPM. The calculated spectral dependence of RQPM consists of a number of narrow peaks, and a maximum enhancement factor is attained in the near ultraviolet. The band structure of randomized nonlinear photonic crystal is calculated.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Patrusheva T. N., Balaev D. A., Denisova E. A., Ponomarenko I. V.
Заглавие : Cobalt ferrite nanoparticles in a mesoporous silicon dioxide matrix
Коллективы : Development of the Scientific Potential of Higher Education [RNP. 2.1.1/2584]; Krasnoyarsk Regional Science Foundation; Russian Foundation for Basic Research [r-Enisei-a 03-07-96803, 09-02-98002-r_sibir'_a]
Место публикации : Tech. Phys. Lett. - 2009. - Vol. 35, Is. 10. - P.882-884. - ISSN 1063-7850, DOI 10.1134/S1063785009100022
Примечания : Cited References: 10. - This study was supported in part by the Federal Program "Development of the Scientific Potential of Higher Education" (project no. RNP. 2.1.1/2584) and jointly by the Krasnoyarsk Regional Science Foundation and the Russian Foundation for Basic Research (project nos. r-Enisei-a 03-07-96803 and 09-02-98002-r_sibir'_a).
Предметные рубрики: MAGNETIC-PROPERTIES
NANOSIZED COFE2O4
ANISOTROPY
POWDERS
CURVES
Аннотация: We have studied magnetic nanoparticles of cobalt ferrite obtained by the extraction-pyrolysis method in a mesoporous silicon dioxide (MSM-41) molecular sieve matrix. The X-ray diffraction data show evidence for the formation of CoFe(2)O(4) particles with a coherent scattering domain size of similar to 40 nm. Measurements of the magnetization curves showed that powders consisting of these nanoparticles are magnetically hard materials with a coercive field of H (c)(4.2 K) = 9.0 kOe and H (c)(300 K) = 1.8 kOe and a reduced remanent magnetization of M (r)/M (s)(4.2 K) = 0.83 and M (r)/M (s)(300 K) = 0.49. The shape of the low-temperature (4.2 K) magnetization curves is adequately described in terms of the Stoner-Wohlfarth model for randomly oriented single-domain particles with a cubic magnetic anisotropy.
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