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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bartolome J., Badía-Romano L., Rubin J., Bürgler D. E., Ovchinnikov S. G., Varnakov S.N.
Заглавие : Morphological and magnetic study at the interfaces of (fE/sI)3 multilayers
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 206. - ISBN 978-5-7444-3124-2
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Морозов, Евгений Владимирович, Шабанова О. В., Фалалеев, Олег Владимирович
Заглавие : Применение ЯМР томографии для исследования межфазных границ в системах коллоидного кремнезема
Место публикации : Конденсир. среды и межфаз. границы. - Воронеж: Воронеж. гос. ун-т, 2012. - Т.14. № 1. - С. 60-69. - ISSN 1606-867X
Аннотация: В работе представлены результаты ЯМР томографических исследований золей коллоидного кремнезема, полученных из силикатов щелочных металлов кислотным выщелачиванием. Исследована динамика времен ядерной спин-решеточной и спин-спиновой релаксации в процессе гелеобразования, а также визуализировано пространственное распределение протекающих процессов. Рассмотрена методологическая сторона проблемы обеспечения контраста на ЯМР томограммах модельных коллоидных систем при золь-гель переходе. Экспериментально продемонстрирована актуальность разработки методологии исследования межфазных границ с помощью нового для данного направления метода.The NMR Imaging investigation results of colloid silica obtained from alkali metals silicates by acidic leaching are presented. The dynamic of nuclear spin-lattice and spin-spin relaxation times was studied during the sol-gel transfer processes and the spatial distribution of occurred processes was visualized. The methodological direction of problem associated with contrast supply on the NMR Images was examined using model colloids samples during sol-gel transfer. It was demonstrated experimentally that the development of interfaces investigation methodology seems to be very important for advance of NMR Imaging to this field of research.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Volkov N. V., Eremin E. V., Tarasov A. S., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Bias-current and optically driven transport properties of the hybrid Fe/SiO 2/p-Si structures
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.526-529. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.526. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): hybrid structure--mis transition--photoelectric effect--schottky barrier--channel switching--comparative analysis--electron hole pairs--fe films--fe layer--ferromagnetic films--hybrid structure--optical effects--optical radiations--photogeneration--planar geometries--schottky barriers--semiconductor substrate--temperature variation--critical currents--interfaces (materials)--magnetic materials--photoelectricity--schottky barrier diodes--silicon--switching circuits--transport properties
Аннотация: Pronounced optical- and bias-current-sensitive features of the transport properties of a Fe/SiO 2/p-Si hybrid structure in planar geometry at temperature variation are investigated. Comparative analysis of two Fe/SiO 2/p-Si samples, one with a continuous Fe film and the other with two electrodes formed from a Fe layer and separated by a micron gap, shows that these features are due to the MIS transition with a Schottky barrier near the interface between SiO 2 and p- Si. Resistance of such a MIS transition depends exponentially on temperature and bias. In the structure with a continuous ferromagnetic film, the competition between conductivities of the MIS transition and the Fe layer results in the effect of current channel switching between the Fe layer and a semiconductor substrate. Within certain limits, this process can be controlled by a bias current and optical radiation. The mechanism of the optical effect is photogeneration of electron-hole pairs in the semiconductor substrate near its boundary with SiO 2 layer. В© (2012) Trans Tech Publications.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Morozov E. V.
Заглавие : NMR Imaging as a tool to study interfaces in colloidal and microheterogeneous systems
Коллективы : Санкт-Петербургский государственный университет, "Nuclear Magnetic Resonance in Condensed Matter", International symposium and summer school (NMR in Heterogeneous Systems, meeting 9th; 2012 ; июль ; 9-13; Санкт-Петербург)
Место публикации : Int. symp. and summer school "Nuclear magnetic res. in condensed matter": Book of abstracts. - СПб., 2012. - P.50
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev A. D., Freydman A. L.
Заглавие : Implementation of the Astrov method for measuring the ME E effect with the use of a vibrating-coil magnetometer
Место публикации : J. Surf. Invest.: Pleiades Publishing, 2014. - Vol. 8, Is. 1. - P.17-19. - ISSN 1027-4510, DOI 10.1134/S1027451014010078. - ISSN 1819-7094
Примечания : Cited References: 12
Предметные рубрики: Surfaces and Interfaces, Thin Films
Ключевые слова (''Своб.индексиров.''): ac voltage--external fields--magnetization hysteresis--repolarization--temperature dependence
Аннотация: A setup is developed for measuring the ME E effect by fixing the amplitude of magnetization oscillations upon the repolarization of a sample, caused by the application of ac voltage to the sample plates. The temperature dependence of the ME E effect in a Ga2 - xFexO3 single-crystal sample is measured in external fields from 0.25 to 1 kOe at temperatures from 77.4 to 280 K. It is established that the effect disappears when the Curie temperature is attained. The hysteresis of the magnetoelectric effect related to the magnetization hysteresis is measured. © 2014 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spectral properties of waves in superlattices with 2D and 3D inhomogeneities
Место публикации : Journal of Experimental and Theoretical Physics. - 2011. - Vol. 113, Is. 2. - P.232-244. - ISSN 1063-7761, DOI 10.1134/S1063776111080061
Ключевые слова (''Своб.индексиров.''): analytic expressions--brillouin zone boundary--density of state--dynamic susceptibility--inhomogeneities--one-dimensional density--optical methods--optical structures--peak height--root mean squares--spectral properties--superlattice layers--two phase--wave numbers--green's function--magnetic susceptibility--optical multilayers--phase interfaces--three dimensional--superlattices
Аннотация: We investigate the dynamic susceptibility and one-dimensional density of states in an initially sinusoidal superlattice containing simultaneously 2D phase inhomogeneities simulating correlated rough-nesses of superlattice interfaces and 3D amplitude inhomogeneities of the superlattice layer materials. The analytic expression for the averaged Green's function of the sinusoidal superlattice with two phase inhomogeneities is derived in the Bourret approximation. It is shown that the effect of increasing asymmetry in the peak heights of dynamic susceptibility at the Brillouin zone boundary of the superlattice, which was discovered earlier [15] upon an increase in root-mean-square (rms) fluctuations, also takes place upon an increase in the correlation wavenumber of inhomogeneities. However, the peaks in this case also become closer, and the width and depth of the gap in the density of states decrease thereby. It is shown that the enhancement of rms fluctuations of 3D amplitude inhomogeneities in a superlattice containing 2D phase inhomogeneities suppresses the effect of dynamic susceptibility asymmetry and leads to a slight broadening of the gap in the density of states and a decrease in its depth. Targeted experiments aimed at detecting the effects studied here would facilitate the development of radio-spectroscopic and optical methods for identifying the presence of inhomogeneities of various dimensions in multilayer magnetic and optical structures. В© 2011 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Tsikalov D. S.
Заглавие : Spectral properties of waves in superlattices with 2D and 3D inhomogeneities
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 113, Is. 2. - P.232-244. - ISSN 1063-7761, DOI 10.1134/S1063776111080061
Примечания : Cited References: 24. - This study was supported in part by the program of the Presidium of the Russian Academy of Sciences (grant no. 27.1), Federal Targeted Program (State contract no. 02.740.11.0220), and Targeted Programs "Development of the Higher School Scientific Potential" in 2009-2010 and 2011 years.
Предметные рубрики: X-RAY REFLECTION
PERTURBED FIELDS
MULTILAYERS
SUSCEPTIBILITY
PROPAGATION
INTERFACES
SCATTERING
SYSTEM
Аннотация: We investigate the dynamic susceptibility and one-dimensional density of states in an initially sinusoidal superlattice containing simultaneously 2D phase inhomogeneities simulating correlated rough-nesses of superlattice interfaces and 3D amplitude inhomogeneities of the superlattice layer materials. The analytic expression for the averaged Green's function of the sinusoidal superlattice with two phase inhomogeneities is derived in the Bourret approximation. It is shown that the effect of increasing asymmetry in the peak heights of dynamic susceptibility at the Brillouin zone boundary of the superlattice, which was discovered earlier [15] upon an increase in root-mean-square (rms) fluctuations, also takes place upon an increase in the correlation wavenumber of inhomogeneities. However, the peaks in this case also become closer, and the width and depth of the gap in the density of states decrease thereby. It is shown that the enhancement of rms fluctuations of 3D amplitude inhomogeneities in a superlattice containing 2D phase inhomogeneities suppresses the effect of dynamic susceptibility asymmetry and leads to a slight broadening of the gap in the density of states and a decrease in its depth. Targeted experiments aimed at detecting the effects studied here would facilitate the development of radio-spectroscopic and optical methods for identifying the presence of inhomogeneities of various dimensions in multilayer magnetic and optical structures.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Badía-Romano L., Rubin J., Bartolomé F., Magen C., Bartolome J., Varnakov S. N., Ovchinnikov S. G., Rubio-Zuazo J., Castro G.R.
Заглавие : Morphology of the asymmetric iron-silicon interfaces
Место публикации : J. Alloys Compd.: Elsevier Science, 2015. - Vol. 627. - P.136-145. - ISSN 0925, DOI 10.1016/j.jallcom.2014.12.019. - ISSN 18734669(eISSN)
Примечания : Cited References:69. - The financial support of the Spanish MINECO MAT2011-23791, the Presidentof Russia Grant (NSh-1044.2012.2), RFFI Grant 13-02-01265, the Ministryof Education and Science of Russian Federation (14.604.21.0002 and02G25.31.0043), Aragonese DGA-IMANA E34 (cofunded by Fondo SocialEuropeo) and that received from the European Union FEDER funds isacknowledged. L.B.R. acknowledges the Spanish MINECO FPU 2010 grant.
Предметные рубрики: RAY PHOTOELECTRON-SPECTROSCOPY
ELECTRON MOSSBAUER-SPECTROSCOPY
Ключевые слова (''Своб.индексиров.''): fe/si nanolayers--interfaces--fe silicides--compositional depth--haxpes--cems
Аннотация: A systematic study of the iron–silicon interfaces formed upon preparation of (Fe/Si) multilayers has been performed by combination of modern and powerful techniques. Samples were prepared by thermal evaporation under ultrahigh vacuum onto a Si(1 0 0) substrate. The morphology of these films and their interfaces was studied by a combination of scanning transmission electron microscopy, X-ray reflectivity, angle resolved X-ray photoelectron spectroscopy and hard X-ray photoelectron spectroscopy. The Si-on-Fe interface thickness and roughness were determined to be 1.4(1) nm and 0.6(1) nm, respectively. Moreover, determination of the stable phases formed at both Fe-on-Si and Si-on-Fe interfaces was performed using conversion electron Mössbauer spectroscopy on multilayers with well separated Si-on-Fe and Fe-on-Si interfaces. It is shown that while a fraction of Fe remains as α-Fe, the rest has reacted with Si, forming the paramagnetic c-Fe1−xSi phase and a ferromagnetic Fe rich silicide (DO3 type phase). We conclude that the paramagnetic c-Fe1−xSi silicide sublayer is identical in both Si-on-Fe and Fe-on-Si interfaces, whereas an asymmetry is revealed in the composition of the ferromagnetic silicide sublayer.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Kovaleva E. A., Tomilin F. N., Mikhaleva N. S., Kuklin A. V.
Заглавие : On the possibility of contact-induced spin polarization in interfaces of armchair nanotubes with transition metal substrates
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2015. - Vol. 396. - P.102-105. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2015.08.037
Примечания : Cited References: 24. - This work was supported by the government contract of The Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant no. 161500.2014/K). The authors would like to thank Institute of Computational Modeling of SB RAS, Krasnoyarsk; Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk: and Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk for providing the access to their supercomputers.
Предметные рубрики: INITIO MOLECULAR-DYNAMICS
TOTAL-ENERGY CALCULATIONS
AUGMENTED-WAVE METHOD
CARBON NANOTUBES
BASIS-SET
1ST-PRINCIPLES
SURFACES
Ключевые слова (''Своб.индексиров.''): nanotubes--cobalt--nickel--spin polarization--dft
Аннотация: The interaction between armchair carbon and boron nitride nanotubes (NT) with ferromagnetic transition metal (TM) surfaces, namely, Ni(111) and Co(0001), was studied by means of density functional theory. Different configurations of composite compartments mutual arrangement were considered. Partial densities of states and spin density spatial distribution of optimized structures were investigated. Influence of ferromagnetic substrate on nanotubes' electronic properties was discussed. The values of spin polarization magnitude at the Fermi level are also presented and confirm the patterns of spin density spatial distribution. © 2015 Elsevier B.V. All rights reserved.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bartolomé J., Badía-Romano L., Rubín J. , Magén C., Bürgler D. E., Rubio-Zuazo J., Castro G. R. , Varnakov S. N., Yakovlev I. A., Tarasov I. A., Belyaev B. A., Lyashchenko S. A., Platunov M. S., Ovchinnikov S. G.
Заглавие : Structure and composition of Fe-Si interfaces in (Fe/Si)3 multilayer nanostructures
Коллективы : Asian School-Conference on Physics and Technology of Nanostructured Materials, Азиатская школа-конференция по физике и технологии наноструктурированных материалов
Место публикации : Third Asian school-conference on physics and technology of nanostructured materials (ASCO-NANOMAT 2015): proceedings. - Vladivostok: Dalnauka, 2015. - Ст.PS.20.02i. - P.18-19. - ISBN 978-5-8044-1556-4
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