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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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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bartolomé J., Badía-Romano L., Rubín J. , Bartolomé F., Magén C., Bürgler D. E., Rubio-Zuazo J., Castro G. R. , Varnakov S. N., Yakovlev I. A., Tarasov I. A., Platunov M. S., Ovchinnikov S. G.
Заглавие : Composition and morphology of Fe-Si interfaces and (Fe/Si)3 multilayer nanostructures
Коллективы : International Conference on Magnetism
Место публикации : 20th Int. Conf. on Magnetism (ICM-2015): book of abstracts. - 2015. - Ст.WE.J.2_I1
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Beisel N. F., Galashov E. N., Mandrik E. M., Molokeev M. S., Yelisseyev A. P., Yusuf A. A., Xia Z.
Заглавие : Pressure-stimulated synthesis and luminescence properties of microcrystalline (Lu,Y)3Al5O12:Ce3+ garnet phosphors
Место публикации : ACS Appl. Mater. Interfaces: American Chemical Society, 2015. - Vol. 7, Is. 47. - P.26235-26243. - ISSN 19448244 (ISSN), DOI 10.1021/acsami.5b08411
Примечания : Cited References: 75. - This work was partly supported by the National Natural Science Foundations of China (Grant Nos. 51272242 and 51511130035) and the Russian Foundation for Basic Research (Grant No. 15-52-53080 GFEN_a). V.V.A. was partly supported by the Ministry of Education and Science of the Russian Federation
Предметные рубрики: LASER MASS-SPECTROMETRY
LIGHT-EMITTING-DIODES
WHITE-LIGHT
SINGLE-CRYSTALS
OPTICAL-PROPERTIES
ELECTRONIC-STRUCTURE
VIBRATIONAL PROPERTIES
PHASE-TRANSITIONS
PARTICLE-SIZE
GROWTH
Ключевые слова (''Своб.индексиров.''): synthesis--pressure--garnet--structure--luminescence--phosphor
Аннотация: The Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 phosphors were synthesized by solid state reaction at temperature 1623 K and pressure 1.5 × 107 Pa in (95% N2 + 5% H2) atmosphere. Under the conditions, the compounds crystallize in the form of isolated euhedral partly faceted microcrystals ∼19 μm in size. The crystal structures of the Lu2.98Ce0.01Y0.01Al5O12 and Y2.99Ce0.01Al5O12 garnets have been obtained by Rietveld analysis. The photoluminescence (PL) and X-ray excited luminescence (XL) spectra obtained at room temperature indicate broad asymmetric bands with maxima near 519 and 540 nm for Y2.99Ce0.01Al5O12 and Lu2.98Ce0.01Y0.01Al5O12, respectively. The light source was fabricated using the powder Lu2.98Ce0.01Y0.01Al5O12 phosphor and commercial blue-emitting n-UV LED chips (λex = 450 nm). It is found that the CIE chromaticity coordinates are (x = 0.388, y = 0.563) with the warm white light emission correlated color temperature (CCT) of 6400 K and good luminous efficiency of 110 lm/W. © 2015 American Chemical Society.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bartolome J., Badía-Romano L., Rubin J., Bartolome F., Varnakov S. N., Ovchinnikov S. G., Burgler D.E.
Заглавие : Magnetic properties, morphology and interfaces of (Fe/Si)n nanostructures
Коллективы : International Conference on Magnetism
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2016. - Vol. 400. - P.271-275. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2015.07.046
Примечания : Cited References: 43. - The financial support of the Spanish MINECOMAT2011-23791 and MAT2015-53921-R, Aragonese DGA-IMANAE34 (cofounded by Fondo Social Europeo) and European FEDER funds is acknowledged. Program of the President of the Russian Federation for the support of leading scientific schools (Scientific School 2886.2014.2), RFBR (Grant no. 13-02-01265), the Ministry of Education and Science of the Russian Federation (State contract no. 02.G25.31.0043 and State task no. 16.663.2014К)
Предметные рубрики: INTERLAYER EXCHANGE
Fe/Si(100) INTERFACE
SILICIDE FORMATION
ULTRAHIGH-VACUUM
FILMS
IRON
MAGNETORESISTANCE
SUPERLATTICES
SPECTROSCOPY
DEPOSITION
Аннотация: A systematic study of the iron–silicon interfaces formed upon preparation of (Fe/Si) multilayers has been performed by the combination of modern and powerful techniques. Samples were prepared by molecular beam epitaxy under ultrahigh vacuum onto Si wafers or single crystalline Ag(100) buffer layers grown on GaAs(100). 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 FeSi phase and a ferromagnetic Fe rich silicide. We conclude that there is an identical paramagnetic c-Fe1−xSi silicide sublayer 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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mankov Y. I., Tsikalov D. S.
Заглавие : High-frequency susceptibility of a multilayered ferromagnetic system with two-dimensional inhomogeneities
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 3. - P544-553. - ISSN 1063-7834, DOI 10.1134/S1063783410030157
Примечания : Cited References: 24. - This study was supported in part by the Council on Grants from the President of the Russian Federation for the State Support of Scientific Investigations performed by the Leading Scientific Schools (grant no. 3818.2008.3), the Presidium of the Russian Academy of Sciences (Program no. 27.1), and the Ministry of Education and Science within the framework of the Federal Program (State Contract no. 2.740.11.0220).
Предметные рубрики: SPIN-WAVE SUSCEPTIBILITY
SPECTRUM
SUPERLATTICES
INTERFACES
Аннотация: This paper reports on the results of the investigation of the high-frequency susceptibility of a layered ferromagnetic structure in which, apart from a periodic change in the magnetic anisotropy parameter from layer to layer, this parameter varies along layers according to a random law (the superlattice with two-dimensional phase inhomogeneities). The evolution of the frequency dependence of the imaginary part of the averaged Green's function in the range of the energy gap (band gap) in the spectrum of waves propagating along the superlattice axis due to the change in the relative root-mean-square fluctuations of the phase gamma 2 has been studied at the boundaries of the odd Brillouin zones. It has been found that, for all odd Brillouin zones, the imaginary part of the Green's function exhibits a universal behavior: the peak corresponding to the edge of the band gap with a lower frequency remains unchanged, and the peak corresponding to the edge of the band gap with a higher frequency is smoothed with an increase in the quantity gamma(2). These effects, which were initially revealed at the boundary of the first Brillouin zone of the sinusoidal superlattice, have been explained, as before, by the specific features of the energy conservation laws for the incident and scattered waves in the lattice with two-dimensional inhomogeneities. It has been demonstrated that an increase in the Brillouin zone number leads to a decrease in the value of gamma(2) at which the peak at the edge of the band gap with a higher frequency disappears.
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15.

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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Mankov Y. I., Tsikalov D. S.
Заглавие : High-Frequency Susceptibility of a Superlattice with 2D Inhomogeneities
Коллективы :
Разночтения заглавия :авие SCOPUS: High-frequency susceptibility of a superlattice with 2D inhomogeneities
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 107, Is. 4. - P603-611. - ISSN 1063-7761, DOI 10.1134/S1063776108100075
Примечания : Cited References: 26. - This work was supported in part by grant no. 3818.2008.3 from the President of Russia in accordance with the program supporting leading scientific schools.
Предметные рубрики: SPIN-WAVE SUSCEPTIBILITY
PERIODIC MULTILAYERS
LOCALIZATION
SYSTEMS
SPECTRUM
DISORDER
MEDIA
Ключевые слова (''Своб.индексиров.''): energy conservation--energy gap--energy management--frequency bands--gallium alloys--green's function--probability density function--three dimensional--band gaps--energy conservation laws--green functions--high frequencies--imaginary parts--magnon crystals--scattered waves--superlattice layers--wave spectrums--phase interfaces
Аннотация: We investigate the high-frequency susceptibility (Green function) of an initially sinusoidal 1D superlattice with 2D phase inhomogeneities that model the deformations of the interfaces between the superlattice layers. For waves propagating along the superlattice axis ( the geometry of a photon or magnon crystal), we have found a peculiar behavior of the imaginary part of the Green function that consists in a significant difference between the peaks corresponding to the edges of the band gap in the wave spectrum. The peak corresponding to the lower-frequency band edge remains essentially unchanged as the root-mean-square fluctuation of the 2D inhomogeneities. 2 increases, while the peak corresponding to the higher-frequency band edge broaden and decreases sharply in height until its complete disappearance with increasing gamma(2). This behavior of the peaks corresponds to a band gap closure mechanism that differs from the traditional one characteristic of 1D and 3D inhomogeneities. These effects can be explained by a peculiarity of the energy conservation laws for the incident and scattered waves for 2D inhomogeneities in a 1D superlattice.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Sablina K. A., Bayukov O. A., Eremin E. V., Petrakovskii G. A., Velikanov D. A., Balaev A. D., Bovina A. F., Boni P., Clementyev E.
Заглавие : Magnetic properties of the mixed-valence manganese oxide Pb(3)Mn(7)O(15)
Разночтения заглавия :авие SCOPUS: Magnetic properties of the mixed-valence manganese oxide Pb 3Mn7O15
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2008. - Vol. 20, Is. 5. - Ст.55217. - ISSN 0953-8984, DOI 10.1088/0953-8984/20/5/055217
Примечания : Cited References: 16
Предметные рубрики: CRYSTAL-STRUCTURE
PHASE-SEPARATION
Ключевые слова (''Своб.индексиров.''): crystal structure--magnetization--manganese compounds--phase interfaces--x ray diffraction--manganese oxide--space groups--temperature range--single crystals
Аннотация: A Pb(3)Mn(7)O(15) single crystal has been grown by the flux method and studied using x-ray diffraction and magnetization measurements. The crystal is hexagonal (P6(3)/mcm space group, Z = 4) and exhibits a pronounced layered nature. Along the [001] direction (c axis), the structure consists of layers of edge-sharing MnO(6) octahedra. Pairs of Mn atoms occupy the octahedral sites located between layers forming 'bridges' along the c axis, which link neighboring Mn layers. The magnetic properties of the crystal have been investigated using ac and dc magnetization measurements in the temperature range 2-900 K at magnetic fields up to 90 kOe. The experimental data obtained suggest that in the temperature region under study several different magnetic phases can be distinguished. Down to similar to 250 K, the crystal is in the paramagnetic state. Below this temperature, short-range antiferromagnetic ordering apparently starts forming within Mn layers, although a transition to long-range magnetic order occurs at 70 K. The magnetization data obtained leads us to conclude that this state is canted antiferromagnetic with moments lying in the basal plane of the crystal. In addition, below 20 K the crystal undergoes one more magnetic transition that corresponds to spin reorientation.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Ospishchev S. V., Petrov M. I., Aleksandrov K. S.
Заглавие : The effect of paramagnetic impurities in normal metal on the critical current in a network of S-N-S Josephson junctions in bulk Y3/4Lu1/4Ba2Cu3O7+BaPb(1-x)Fe(x)O(3)composites
Разночтения заглавия :авие SCOPUS: The effect of paramagnetic impurities in normal metal on the critical current in a network of S-N-S Josephson junctions in bulk Y3/4Lu1/4Ba2Cu3O7 + BaPb1-xFexO3 composites
Место публикации : Supercond. Sci. Technol. - 2003. - Vol. 16, Is. 1. - P.60-64. - ISSN 0953-2048, DOI 10.1088/0953-2048/16/1/311
Примечания : Cited References: 41
Предметные рубрики: CURRENT-VOLTAGE CHARACTERISTICS
WEAK LINKS
RESISTIVE PROPERTIES
MAGNETIC-IMPURITIES
EXCHANGE FIELD
SNS JUNCTIONS
F-S
COMPOSITES
SUPERCONDUCTOR
SCATTERING
Ключевые слова (''Своб.индексиров.''): critical currents--interfaces (materials)--josephson junction devices--paramagnetism--transport properties--non-superconducting ingredient--paramagnetic impurities--superconductor normal metal superconductor--oxide superconductors
Аннотация: Bulk Y3/4Lu1/4Ba2Cu3O7 + BaPb1-xFexO3 composites representing a model of a network of superconductor-normal metal-superconductor (SNS) Josephson junctions with paramagnetic impurities (Fe) in the N layers have been prepared. The transport properties of the composites have been studied. An exponential decay of the critical current with increasing Fe content in the non-superconducting ingredient of the composite has been observed. Such a behaviour is accounted for in terms of the de Gennes proximity effect theory.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mamalis A. G., Ovchinnikov S. G., Petrov M. I., Balaev D. A., Shaihutdinov K. A., Gohfeld D. M., Kharlamova S. A., Vottea I. N.
Заглавие : Composite materials on high-T-c superconductors and BaPbO3, Ag basis
Коллективы : International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials
Разночтения заглавия :авие SCOPUS: Composite materials on high-Tc superconductors and BaPbO3, Ag basis
Место публикации : Physica C. - 2001. - Vol. 364. - P.174-177. - ISSN 0921-4534, DOI 10.1016/S0921-4534(01)00749-3
Примечания : Cited References: 9
Ключевые слова (''Своб.индексиров.''): composite high-t-c superconductors--superconducting fault current limiter--composite high-tc superconductors--superconducting fault current limiter--composite materials--electric fault currents--interfaces (materials)--magnetic variables measurement--mathematical models--scanning electron microscopy--spectrometry--superconducting transition temperature--superconductivity--x ray diffraction analysis--solid state reactions--high temperature superconductors
Аннотация: The preparation., processing and characterization of the composite materials on high-T-c superconductor (HTSC) basis, YBa2Cu3O7/Ag and Y0.75Lu0.25Ba2Cu3O7/BaPbO3, is reported. The initial components YBa2Cu3O7 and BaPbO3 were prepared by the standard solid state reaction technique. The microstructures of the samples were observed by scanning electron microscopy. whilst the XRD paterns of the composites HTSC+Ag and HTSC+BaPbO3 revealed the 123 superconducting phase and the Ag or BaPbO3 structure. The chemical compositions of the powders and the interface zone were found by employing energy dispersive spectrometry. The resistive and magnetic measurements of the composites indicated the transition temperature 93.5 K. Application of such composite materials in the construction of a superconducting fault current limiter model is reported. (C) 2001 Elsevier Science B.V. All rights reserved.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ignatchenko V. A., Mankov Y. I., Maradudin A. A.
Заглавие : Wave spectrum of multilayers with finite thicknesses of interfaces
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2000. - Vol. 62, Is. 3. - P2181-2184. - ISSN 0163-1829, DOI 10.1103/PhysRevB.62.2181
Примечания : Cited References: 24
Предметные рубрики: SPIN
EXCITATIONS
MEDIA
Аннотация: To describe a multilayer structure with arbitrary thicknesses of the interfaces between layers, we introduce a model in which the dependence of a material parameter along the axis of such a superlattice is described by a Jacobian elliptic sine function. Depending on the value of the modulus kappa of the elliptic function, the model describes the limiting cases of multilayers with sharp interfaces (kappa=1, d/l=0, where d is the thickness of the interface, l is the period of the superlattice) and of sinusoidal superlattices (kappa=0, d/l=1/4), as Well as all intermediate situations. We investigate the wave spectrum in such a superlattice. The dependences of the widths of the gaps in the spectrum at the boundaries of ail odd Brillouin zones on the ratio d/l are found. It is shown that the thicknesses of the interfaces can be determined if the experimental value of the relation between the widths of the first gap Delta v(1) and any other gap Delta v(n) is known.
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