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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Komogortsev S. V., Chizhik N. A., Filatov E. Yu., Korenev S. V., Shubin Yu.V., Velikanov D. A., Iskhakov R. S., Yurkin G.Yu.
Заглавие : Magnetic properties and L1 0 phase formation in CoPt nanoparticles
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.159-162. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.159. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): hard magnetic--magnetic anisotropy--magnetic nanoparticles--remnant magnetization--annealing time--copt nanoparticles--disorder-order--domain formation--hard magnetic--magnetic anisotropy energy--magnetic nanoparticles--phase formations--remnant magnetization--decomposition--magnetic anisotropy--magnetic materials--remanence--nanoparticles
Аннотация: The effect of the atomic disorder-order transformation on remanence, coercivity and magnetic anisotropy energy in CoPt nanoparticles prepared by thermal decomposition and annealed at 400oC for 4 and 16 hours has been studied. The observed remanence and magnetic anisotropy energy enhancement versus annealing time are discussed in the terms of ordering domain formation inside nanoparticles. В© (2012) Trans Tech Publications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Zhigalov V. S., Matsynin A. A., Bykova L. E., Mikhlin Y. L., Bondarenko G. N., Patrin G. S., Yurkin G. Yu.
Заглавие : Formation of ferromagnetic germanides by solid-state reactions in 20Ge/80Mn films
Место публикации : Thin Solid Films: Elsevier Science, 2014. - Vol. 552. - P.86-91. - ISSN 0040-6090, DOI 10.1016/j.tsf.2013.12.029
Примечания : Cited References: 53
Предметные рубрики: PHASE-FORMATION
MAGNETIC-PROPERTIES
Mn5Ge3 FILMS
X-RAY
Ge(111)
TRANSFORMATIONS
DIFFUSION
SPECTRA
SYSTEM
LAYERS
Ключевые слова (''Своб.индексиров.''): manganite-germanium--solid state reaction--first phase--mn5ge3 alloy--carbon impurity--oxygen impurity--annealing--magnetic anisotropy
Аннотация: Solid state reactions between Ge and Mn films are systematically examined using X-ray diffraction, photoelectron spectroscopy, and magnetic and electrical measurements. The films have a nominal atomic ratio Ge:Mn = 20:80 and are investigated at temperatures from 50 to 500 °C. It is established that after annealing at ~ 120°C, the ferromagnetic Mn5Ge3 phase is the first phase to form at the 20Ge/80Mn interface. As the annealing temperature increases to 300°C, the weak magnetic Mn5Ge 2 + Mn3Ge phases simultaneously begin to grow and they become dominant at 400°C. Increasing the annealing temperature to 500°C leads to the formation of the ferromagnetic phase with a Curie temperature TC ~ 350-360 K and magnetization 14-25 kA/m at room temperature. The X-ray diffraction study of the samples shows the reflections from the Mn 5Ge3 phase, and the photoelectron spectra contain the oxygen and carbon peaks. The homogeneous distribution of oxygen and carbon over the sample thickness suggests that the increased Curie temperature and magnetization are related to the migration of C and O atoms into the Mn 5Ge3 lattice and the formation of the Nowotny phase Mn5Ge3CxOy. The initiation temperature (~ 120 C) is the same in the Mn5Ge3 phase with the solid-state reactions in the Ge/Mn films as well as in the phase separation in the GexMn1 - x diluted semiconductors. Thus, we conclude that the synthesis of the Mn5Ge3 phase is the moving force for the spinodal decomposition of the GexMn 1 - x diluted semiconductors.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Badía-Romano L., Rubín J., Magén C., Bartolomé F., Sesé J., Ibarra M.R., Bartolomé J., Hierro-Rodriguez A., Martín J.I., Alameda J.M., Bürgler D.E., Varnakov S. N., Komogortsev S. V., Ovchinnikov S. G.
Заглавие : Thermomagnetic behaviour and compositional irreversibility on (Fe/Si)3 multilayer films
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2014. - Vol. 364. - P.24-33. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2014.04.029. - ISSN 1873-4766
Примечания : Cited References: 52. - The financial support of the Spanish MINECOMAT2011-23791, FIS2008-06249, the President of Russia Grant (NSh-1044.2012.2), RFFI Grant 13-02-01265, 14-0290404, Aragonese DGA-IMANA E34 (cofunded by Fondo Social Europeo) and that received from the European Union FEDER funds is acknowledged. L.B.R. acknowledges the Spanish MINECO FPU 2010 grant. Authors would like to acknowledge the use of Servicio General de Apoyo a la Investigación-SAI, Universidad de Zaragoza.
Предметные рубрики: SPUTTERED FE/SI SUPERLATTICES
INTERLAYER EXCHANGE
GIANT MAGNETORESISTANCE
MAGNETIC-PROPERTIES
SILICIDE FORMATION
EPITAXIAL-GROWTH
ROOM-TEMPERATURE
IRON DISILICIDE
TRILAYER FILMS
THIN-FILMS
Ключевые слова (''Своб.индексиров.''): fe-si multilayer--chemical transformation--fe silicide--interlayer exchange coupling--magnetic domain--in situ annealing
Аннотация: This work presents the correlation between the morphology and magnetic properties of (Fe/Si)3 multilayers with different Fe layer thicknesses and fixed Si spacer thickness in a broad temperature range (View the MathML source5T800K). Films were prepared by thermal evaporation under ultrahigh vacuum onto a buffer layer of Fe/Ag deposited on a GaAs(001) substrate. Transmission electron microscopy reveals good epitaxial growth and phase transformations in the c-FeSi phase formed during deposition as well as upon subsequent annealing of the sample up to 800 K. Remanence to saturation magnetization MR/MS ratios and saturation fields are related to several types of interlayer exchange coupling. 90°-coupling and a superposition of 90° and antiferromagnetic interlayer exchange coupling are found depending on the Fe layer thickness. Magnetization curves were investigated as a function of temperature by in situ annealing. They show an irreversible thermal process as temperature increases from 300 to 450 K that is correlated to the formation of a ferromagnetic silicide phase. At higher temperature this phase transforms into a paramagnetic Fe–Si phase.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Yaroslavtsev R. N., Chekanova L. A., Iskhakov R. S.
Заглавие : The processes occurring at low temperature annealing in multilayer film structures of Co/Pd
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.VIII.21.09p. - P.294-295. - ISBN 978-5-8044-1556-4
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Yaroslavtsev R. N., Bayukov O. A., Vorotynov A. M., Volochaev M. N., Dubrovskiy A. A.
Заглавие : Change in the magnetic properties of nanoferrihydrite with an increase in the volume of nanoparticles during low-temperature annealing
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 9. - P.1782-1791. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416090092
Примечания : Cited References: 32. - This study was supported by the Ministry of Education and Science of the Russian Federation within the State Task for 2014-2016.
Предметные рубрики: FERRIHYDRITE NANOPARTICLES
BACTERIAL FERRIHYDRITE
FERRITIN
HYSTERESIS
MOSSBAUER
ORIGIN
Аннотация: The results of the investigation into the effect of low-temperature annealing of a powder of nanoparticles of bacterial ferrihydrite on its magnetic properties have been presented. It has been found that an increase in the time (up to 240 h) and temperature (in the range from 150 to 200°C) of annealing leads to a monotonic increase in the superparamagnetic blocking temperature, the coercive force, and the threshold field of the opening of the magnetic hysteresis loop (at liquid-helium temperatures), as well as to an increase in the magnetic resonance line width at low temperatures and in the magnetic susceptibility at room temperature. At the same time, according to the results of the analysis of the Mossbauer spectra, the annealing of ferrihydrite does not lead to the formation of new iron oxide phases. Most of these features are well consistent with the fact that the low-temperature annealing of ferrihydrite causes an increase in the size of nanoparticles, which is confirmed by the results of transmission electron microscopy studies. © 2016, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Denisova E. A., Komogortsev S. V., Iskhakov R. S., Chekanova L. A., Velikanov D. A., Kalinin Y. E., Sitnikov A. V.
Заглавие : Effect of annealing on the magnetic properties of (Co40Fe40B20)x(SiO2)1–x granular nanocomposites
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2016. - Vol. 80, Is. 11. - P.1332-1334. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873816110186
Примечания : Cited References: 31. - This work was supported by the Russian Foundation for Basic Research, project nos. 15-08-06673, 16-03-00256, and RFBR-KRFS 15-42-04171.
Ключевые слова (''Своб.индексиров.''): annealing--magnetic properties--multilayers--spin waves--sputtering--concentration dependence--effect of annealing--granular composites--ion-beam sputtering--metal phase--spin wave resonances--ion beams
Аннотация: The effect of annealing on the magnetic properties of (Co40Fe40B20)x(SiO2)1–x granular composites fabricated via ion-beam sputtering is investigated. It is established that annealing changes the concentration dependences of the ferromagnetic resonance field and linewidth and shifts the regions of metal phase concentration corresponding to the spin-wave resonance. © 2016, Allerton Press, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volochaev M. N., Tarasov I. A., Loginov Yu. Yu., Cherkov A. G., Kovalev I. V.
Заглавие : The regularities of phase formation in Fe3Si(111)/Si(111) structure at vacuum annealing
Коллективы : International Conference on Films and Coatings
Место публикации : J. Phys. Conf. Ser.: IOP, 2017. - Vol. 857, Is. 1. - Ст.012053. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/857/1/012053
Примечания : Cited References: 10
Ключевые слова (''Своб.индексиров.''): coatings--high resolution transmission electron microscopy--molecular beam epitaxy--silicon--transmission electron microscopy--phase formations--polycrystalline--polycrystalline film--si(111) substrate--vacuum-annealing--annealing
Аннотация: The regularities of phase formation and thermal stability in Fe3Si(111)/Si(111) structure at stepped vacuum annealing (350, 450 and 550 °C) were investigated. The layer of 32 nm Fe3Si was deposited onto Si(111) substrate by molecular beam epitaxy at 260 °C. Transmission electron microscopy (TEM) measurements demonstrated that the film thickness increases by ∼19 % at 350 °C annealing without changing the phase composition. The polycrystalline -FeSi sublayer was formed on the interface at 450 °C annealing. Further annealing at 550 °C led to the ∼ 80 nm polycrystalline film formation containing the crystallites of -FeSi, Fe5Si3, and β-FeSi2 phases.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Bunina O. A., Kuprina Yu. A., Lutokhin A. G., Raevskaya S. I., Titov V. V., Orlov S. V., Malitskaya M. A., Gorev M. V., Gorev M. V., Bondarev V. S., Raevski I. P.
Заглавие : The effect of annealing on the structure and phase transitions of Na0.95Li0.05NbO3
Коллективы : International Seminar on Ferroelastic Physics, Международный семинар по физике сегнетоэластиков, Российская академия наук, Воронежский государственный технический университет
Место публикации : Ninth international seminar on ferroelastic physics (ISFP-9): book of abstracts/ org. com. I. N. Flerov [et al.] ; progr. com. V. I. Zinenko [et al.]. - 2018. - P.26
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Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Zobov V. E., Pichkovskiy I. S.
Заглавие : Sequences of selective rotation operators to engineer interactions for quantum annealing on three qutrits
Коллективы : International Conference on Micro- and Nano-Electronics
Место публикации : Proc. SPIE. - 2019. - Vol. 11022: International Conference on Micro- and Nano-Electronics 2018. - Ст.UNSP 110222V. - , DOI 10.1117/12.2521253
Примечания : Cited References: 21
Предметные рубрики: ALGORITHM
Аннотация: We have done simulating of factorization the number 15 on three qutrits, represented by the spins S = 1, by quantum annealing. We assume that strong one-spin interaction allow selectively operate on different transitions between levels of the each qutrit. We present a sequence of selective rotation operators to engineer from dipole-dipole interaction a time-dependent effective Hamiltonian necessary for solving the problem. Also we find dependence of fidelity versus different parameters: magnetic field, total annealing time, and duration of time step, when the continuous variation of the Hamiltonian is replaced by a discrete one.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Зобов, Владимир Евгеньевич, Пичковский И. С.
Заглавие : Последовательности селективных операторов поворотов для создания взаимодействий для квантового отжига на трех кутритах
Место публикации : Сибир. физич. журнал. - 2019. - Т. 14, № 1. - С. 5–16. - ISSN 2541-9447, DOI 10.25205/2541-9447-2019-14-1-5-16; Siberian J. Phys.
Примечания : Библиогр.: 23
Предметные рубрики: Теоретическая и математическая физика
Аннотация: Выполнено моделирование факторизации числа 15 на трех кутритах, представленных спинами S = 1, посредством квантового отжига. Предполагается, что сильное односпиновое взаимодействие позволяет селективно влиять на разные переходы между уровнями каждого из трех кутритов. Подобраны последовательности селективных операторов поворотов для создания из диполь-дипольного взаимодействия изменяющегося во времени эффективного гамильтониана, необходимого для решения задачи. Найдена зависимость точности от параметров магнитного поля, полного времени отжига и длительности временных шагов при замене непрерывного изменения гамильтониана на дискретное.We have done simulating of factorization the number 15 on three qutrits S = 1 by quantum annealing. We assume that strong one-spin interaction allow selectively operate on different transitions between levels of the each qutrit. We present a sequence of selective rotation operators to engineer from dipole-dipole interaction a time-dependent effective Hamiltonian necessary for solving the problem. Also we find dependence of fidelity versus various parameters: magnetic field, total annealing time, and duration of time step, when the continuous variation of the Hamiltonian is replaced by a discrete one.
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