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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Safronov A. P., Beketov I. V., Komogortsev S. V., Kurlyandskaya G. V., Medvedev A. I., Leiman D. V., Larranaga A., Bhagat S. M.
Заглавие : Spherical magnetic nanoparticles fabricated by laser target evaporation
Место публикации : AIP Adv.: American Institute of Physics, 2013. - Vol. 3, Is. 5. - Ст.052135. - P. - ISSN 2158-3226, DOI 10.1063/1.4808368
Примечания : Cited References: 47. - This work was supported by the RFBR 10-02-96015 and 12-02-31385 projects, UrFU 215, Spanish MEC MAT2011-27573-C04 grants, Universidad del Pais Vasco UPV/EHU under UFI11/53 action and Physics Department of the University of Maryland visiting grant. Selected measurements were performed at SGIker service of UPV-EHU. We thank O.M. Samatov, Dr. A.M. Murzakayev, Dr. I. Orue, and A.A. Svalova for special support.
Предметные рубрики: IRON-OXIDE NANOPOWDERS
CO2-LASER EVAPORATION
FE3O4 NANOPARTICLES
FINITE-SIZE
TEMPERATURE
FERROMAGNETS
FERROFLUIDS
DEPENDENCE
EXPLOSION
PARTICLES
Аннотация: Magnetic nanoparticles of iron oxide (MNPs) were prepared by the laser target evaporation technique (LTE). The main focus was on the fabrication of de-aggregated spherical maghemite MNPs with a narrow size distribution and enhanced effective magnetization. X-ray diffraction, transmission electron microscopy, magnetization and microwave absorption measurements were comparatively analyzed. The shape of the MNPs (mean diameter of 9 nm) was very close to being spherical. The lattice constant of the crystalline phase was substantially smaller than that of stoichiometric magnetite but larger than the lattice constant of maghemite. High value of M-s up to 300 K was established. The 300 K ferromagnetic resonance signal is a single line located at a field expected from spherical magnetic particles with negligible magnetic anisotropy. The maximum obtained concentration of water based ferrofluid was as high as 10g/l of magnetic material. In order to understand the temperature and field dependence of MNPs magnetization, we invoke the core-shell model. The nanoparticles is said to have a ferrimagnetic core (roughly 70 percent of the caliper size) while the shell consists of surface layers in which the spins are frozen having no long range magnetic order. The core-shell interactions were estimated in frame of random anisotropy model. The obtained assembly of de-aggregated nanoparticles is an example of magnetic nanofluid stable under ambient conditions even without an electrostatic stabilizer. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komogortsev S. V., Samatov O. M., Leiman D. V., Safronov A. P., Beketov I. V.
Заглавие : Magnetic properties of ferrite nanoparticles fabricated by laser target evaporation
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 62. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Izotov A. V., Solovev P. N.
Заглавие : Growth simulation and structure analysis of obliquely deposited thin films
Коллективы : Ministry of Education and Science of the Russian Federation [A3.528.2014K]
Место публикации : Russ. Phys. J.: Springer, 2016. - Vol. 59, Is. 2. - P.301-307. - ISSN 1064-8887, DOI 10.1007/s11182-016-0771-2. - ISSN 1573-9228(eISSN)
Примечания : Cited References:27. - This work was supported in part by State Assignment for R&D A3.528.2014K of Ministry of Education and Science of the Russian Federation to Siberian Federal University in 2014.
Предметные рубрики: GLANCING ANGLE DEPOSITION
EVAPORATION
ANISOTROPY
Ключевые слова (''Своб.индексиров.''): oblique angle deposition--simulation of film growth--monte carlo method
Аннотация: Based on the Monte Carlo method, a model of growth of thin films prepared by oblique angle deposition of particles is constructed. The morphology of structures synthesized by simulation is analyzed. To study the character of distribution of microstructural elements (columns) in the film plane, the autocorrelation function of the microstructure and the fast Fourier transform are used. It is shown that with increasing angle of particle incidence, the film density monotonically decreases; in this case, anisotropy arises and monotonically increases in the cross sections of columns, and the anisotropy of distribution of columns in the substrate plane also increases.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Varnakov S. N., Komogortsev S. V., Ovchinnikov S. G., Bartolome J., Sese J.
Заглавие : Magnetic properties and nonmagnetic phases formation in (Fe/Si)(n) films
Коллективы :
Разночтения заглавия :авие SCOPUS: Magnetic properties and nonmagnetic phases formation in (Fe/Si) n films
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2008. - Vol. 104, Is. 9. - Ст.94703. - ISSN 0021-8979, DOI 10.1063/1.3005973
Примечания : Cited References: 23. - This work was supported by the Russian Academy of Science program "Spintronics," the complex integration project of the Siberian Branch of the Russian Academy of Science. 3.5, the Russian Foundation for Basic Research (Grant No. 07-03-00320), the "Ramon y Cajal" program, and Project No. MAT 2005/01272 of the Spanish Ministry of Education and Science.
Предметные рубрики: FE/SI/FE TRILAYER FILMS
GIANT MAGNETORESISTANCE
ULTRAHIGH-VACUUM
SUPERLATTICES
MULTILAYERS
EXCHANGE
Ключевые слова (''Своб.индексиров.''): activation energy--integral equations--magnetic properties--magnetization--magnets--multilayers--rate constants--silicon--thermal evaporation--vacuum--vacuum evaporation--fe layers--high temperatures--interface layers--irreversible behaviors--kinetic equations--n films--nonmagnetic--nonmagnetic phases--prefactor--quantitative analysis--rate equations--synthetic procedures--temperature dependences--ultrahigh-vacuum systems--phase interfaces
Аннотация: The magnetization of Fe/Si multilayers, grown by thermal evaporation in an ultrahigh vacuum system, was investigated at high temperatures. Magnetization and its temperature dependence up to a high temperature of 800 K depend on individual Fe layer thickness d(Fe). This dependence is the result of the formation of an Fe-Si interface layer (nonmagnetic phase) during the synthetic procedure. The fraction of this Fe-Si nonmagnetic phase is estimated versus dFe. At temperatures higher than 400 K an irreversible decrease in the magnetization occurs. A quantitative analysis of this irreversible behavior is proposed in terms of an exponential diffusion-like kinetic equation for the reaction that produces the Fe-Si nonmagnetic phase. The coefficients of the rate equation are the activation energy E(a) and the prefactor D(0), which have been determined for different d(Fe). (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3005973]
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Semenov A. P., Semenova I. A., Bulina N. V., Krylov A. S., Churilov G. N., Semenova A. A.
Заглавие : Fullerene films deposited by evaporation in vacuum using spot-focused annular electron beam
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2005. - Vol. 31, Is. 12. - P1036-1038. - ISSN 1063-7850, DOI 10.1134/1.2150891
Примечания : Cited References: 9
Аннотация: A rapidly focused annular electron beam can provide for the effective evaporation of a fullerene mixture in a vacuum of similar to 10(-2) Pa. A 1-kW beam focused into a spot within 0.1-1 s produces explosive evaporation of a fullerene target at an extremely high efficiency of heating. A comparison of the Raman and electronic absorption spectra of the initial fullerene powder and a film deposited upon its evaporation shows that C-60 and C-70 fullerenes are evaporated without rupture of C-C covalent bonds. The electron beam evaporation in vacuum has been successfully used to obtain fullerene films on substrates with an area of similar to 0.1 m(2). (C) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kirenskij L. V., Pyn'ko V. G., Pyn'ko G. P., Sivkov N. I., Komalov A. S.
Заглавие : Epitaxic growth of metal films by termal evaporation on ionic crystals cleaved in vacuum and in air
Коллективы : International Congress of the International Union of Crystallography, International Symposium on Crystal Growth, International Union of Crystallography
Место публикации : Acta Crystallogr. - 1966. - Vol. 21, Pt. 7 Suppl. - P.A276
Аннотация: см. РЖ Phys. Abstr., 1968, 30738
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Вид документа : Статья из сборника (том многотомника)
Шифр издания :
Автор(ы) : Киренский, Леонид Васильевич, Пынько, Виталий Григорьевич, Пынько, Галина Петровна, Сивков, Николай Иванович, Комалов, Александр Семенович
Заглавие : Эпитаксиальный рост металлических пленок при термическом напылении на сколотые в вакууме и в воздухе ионные кристаллы
Коллективы : Академия наук СССР, Институт кристаллографии АН СССР, Международный конгресс кристаллографов, Международный симпозиум по росту кристаллов
Место публикации : Рост кристаллов: сб. статей/ Акад. наук СССР, Ин-т кристаллографии; отв. ред. Н. Н. Шефталь. - М.: Изд-во АН СССР, 1968. - Т. 8, Ч. 2: Адсорбция примесей, эпитаксия и монокристаллические пленки. - С. 164-170 (Шифр В37/Р 78-547910)
Примечания : Библиогр.: 6 назв.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Stolyar S. V., Yakovchuk V. Yu., Chizhik M. V., Pozdnyakov V. G., Vazhenina I. G.
Заглавие : Ferromagnetic and spin-wave resonance in FexNi1-x (0x1) films
Место публикации : TRENDS IN MAGNETISM. - 2011. - Vol. 168-169. - С. 93-96. - ISSN 10120394 (ISSN); 9783037850213 (ISBN), DOI 10.4028/www.scientific.net/SSP.168-169.93
Ключевые слова (''Своб.индексиров.''): correlation radius--dispersion law for spin waves--exchange interaction--ferromagnetic resonance--spin-wave resonance--thermal evaporation method--crystal structure--dispersion (waves)--dispersions--evaporation--exchange interactions--ferromagnetic materials--ferromagnetic resonance--ferromagnetism--resonance--spin waves--crystal structure--dispersion (waves)--evaporation--exchange interactions--ferromagnetic materials--ferromagnetic resonance--ferromagnetism--multilayers--resonance--spin waves--thermal evaporation--bcc structure--correlation radius--dispersion law--feni alloys--magnetic inhomogeneities--magnetic state--magnetization fluctuations--spin-wave resonance--thermal evaporation method--spin wave resonances--thermal evaporation--magnetism
Аннотация: The spectrum of standing exchange magnon wave in FeNi alloy films obtained by thermal evaporation method is studied. The modification of dispersion law conditioned by magnetization fluctuations is detected. The films of invar structure having metastable bcc structure are most dispersing relative to magnetic state. The size of magnetic inhomogeneity was less than 5 nm.
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