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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Говорун, Илья Валерьевич, Лексиков, Александр Александрович, Лексиков, Андрей Александрович, Бабурин А. С.
Заглавие
: Новый метод измерения спектров ФМР
Место публикации
: Изв. вузов. Физика: Томский государственный университет, 2015. - Т. 58, № 8/2. - С. 78-80. - ISSN 0021-3411
Примечания
: Библиогр.: 5. - Работа выполнена при поддержке Министерства образования и науки РФ, соглашение №14-607-21-0039
Ключевые слова
(''Своб.индексиров.''): микрополосковый резонатор--компенсация связей--фмр--полюс затухания--microstrip resonator--compensation interaction--ferromagnetic resonance--
damping
pole
Аннотация:
Продемонстрирован новый метод измерения спектров ФМР, основанный на регистрации параметров полюса затухания на амплитудно-частотной характеристике двухзвенной микрополосковой структуры, содержащей исследуемый образец. Полюс затухания (ноль прохождения) образуется вследствие компенсации емкостного (электрического) и индуктивного (магнитного) взаимодействий между резонаторами структуры, и эта компенсация нарушается в условиях ФМР.A new technique for measuring FMR spectra is demonstrated, which is based on the registering a
damping
pole in the frequency response of two-resonator microstrip structure containing a sample under investigation. A
damping
pole (transmission zero) arises due to mutual compensation of capacitive (electric) and inductive (magnetic) interactions between the resonators, and this compensation get broken in the FMR conditions.
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Polukhin D. S.
Заглавие
: Effect of cross correlations between inhomogeneities on the spectrum and
damping
of spin and elastic waves
Коллективы
:
Место публикации
: Low Temp. Phys. - 2010. - Vol. 36, Is. 8-9. - P.741-746. - ISSN 1063-777X,
DOI
10.1063/1.3490860; \b Физика низких температур
Примечания
: Cited References: 13. - This work was partially supported by Program No. 27 of the Presidium of the Russian Academy of Sciences, State contract No. 02.740.11.0220 as part of the Federal targeted program and the State program "Development of the scientific potential of higher education," project No. 2.1.1/3498.
Предметные рубрики:
FERROMAGNET
Аннотация:
This is a study of the dispersion relations and
damping
of spin waves in ferromagnets with inhomogeneities in their exchange and magnetic anisotropy parameters and of elastic waves in isotropic media with inhomogeneities in the density of matter and in the elastic force constants, with cross correlations between these inhomogeneities taken into account. A general behavior is found which is independent of the physical nature of the waves: the kind of effect cross correlations between inhomogeneities in any two parameters of a material will have on the wave spectrum depends on whether both parameters belong to the same (i.e., both belong to the kinetic part or both belong to the potential part) or to different parts of the hamiltonian. In the former case, positive cross correlations lead to a substantial modification of the dispersion relation and to increased wave
damping
, and in the latter case, to a smaller modification of these characteristics. On the other hand, negative cross correlations lead to the opposite effects in both cases. This behavior is explained qualitatively. (c) 2010 American Institute of Physics. [doi:10.1063/1.3490860]
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Polukhin D. S.
Заглавие
: Effects of cross correlations between inhomogeneities of the parameters of an isotropic medium on the spectrum and
damping
of elastic waves
Коллективы
:
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 110, Is. 2. - P345-359. - ISSN 1063-7761,
DOI
10.1134/S1063776110020184
Примечания
: Cited References: 17. - This study was supported in part by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools (grant no. 3818.2008.3) and the Presidium of the Russian Academy of Sciences (program no. 27.1) and performed within the framework of the Federal Target Program (State Contract no. 02.740.11.0220).
Ключевые слова
(''Своб.индексиров.''): cross correlations--dispersion law--elastic force--inhomogeneities--isotropic medium--negative cross-correlation--physical nature--two parameter--wave spectra--
damping
--dispersions--elastic waves--hamiltonians--dispersion (waves)
Аннотация:
The dispersion and
damping
laws have been investigated for elastic waves in an isotropic medium with one- and three-dimensional inhomogeneities of the density p(x) of the material and the elastic force constants mu(x) and lambda(x) with allowance for the cross correlations between these inhomogeneities. It has been demonstrated that the positive cross correlations between mu(x) and lambda(x), as well as the negative cross correlations between p(x) and mu(x) or p(x) and lambda(x), lead to an enhancement of the modification of the dispersion law and an increase in the
damping
of waves. The positive cross correlations between p(x) and mu(x) or p(x) and lambda(x), as well as the negative cross correlations between mu(x) and lambda(x), result in the opposite effects: a weakening of the modification of the dispersion law and a decrease in the
damping
. An analysis of the results obtained in this paper and in our recent work [15] has made it possible to formulate the general regularity of the effects of cross correlations, irrespective of the physical nature of the waves: the effects of cross correlations between inhomogeneities of any two parameters of the material on the wave spectrum depend on whether both parameters related by the cross correlations belong to the same part of the Hamiltonian (i.e., if they both belong to either the kinetic part or the potential part of the Hamiltonian) or they belong to different parts of the Hamiltonian. The positive cross correlations lead to a greater modification of the dispersion law and to an increase in the
damping
of waves in the former case and to a decrease in these characteristics in the latter case. Correspondingly, the negative cross correlations in each of these cases result in the opposite effects. This regularity has been explained qualitatively.
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Isohatala J., Alekseev K. N., Kurki L. T., Pietilainen P.
Заглавие
: Symmetry breaking in a driven and strongly damped pendulum
Место публикации
: Phys. Rev. E: AMERICAN PHYSICAL SOC, 2005. - Vol. 71, Is. 6. - Ст.66206. - ISSN 1539-3755,
DOI
10.1103/PhysRevE.71.066206
Примечания
: Cited References: 37
Предметные рубрики:
DC VOLTAGE GENERATION
SEMICONDUCTOR SUPERLATTICES
JOSEPHSON-JUNCTIONS
BLOCH OSCILLATIONS
FORCED PENDULUM
CHAOS
FREQUENCY
SYSTEMS
RECTIFICATION
STANDARD
Ключевые слова
(''Своб.индексиров.''): periodically driven pendulums--symmetry breaking--bifurcation (mathematics)--
damping
--dynamics--nonlinear systems--semiconductor superlattices--pendulums
Аннотация:
We examine the conditions for appearance of a symmetry breaking bifurcation in damped and periodically driven pendulums in the case of strong
damping
. We show that symmetry breaking, unlike other nonlinear phenomena, can exist at high dissipation. We prove that symmetry breaking phases exist between phases of symmetric normal and symmetric inverted oscillations. We find that symmetry broken solutions occupy a smaller region of the pendulum's parameter space in comparison to the statements made in earlier considerations [McDonald and Plischke, Phys. Rev. B 27, 201 (1983)]. Our research on symmetry breaking in a strongly damped pendulum is relevant to an understanding of the phenomena of dynamic symmetry breaking and rectification in pure ac driven semiconductor superlattices.
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Mankov Y. I., Maradudin A. A.
Заглавие
: The spectrum and
damping
of waves in partially randomized multilayers
Место публикации
: J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 1999. - Vol. 11, Is. 13. - P.2773-2790. - ISSN 0953-8984,
DOI
10.1088/0953-8984/11/13/013
Примечания
: Cited References: 24
Предметные рубрики:
SPIN-WAVES
SEMICONDUCTOR SUPERLATTICES
LOCALIZATION
SYSTEMS
Аннотация:
The spectrum and
damping
of waves in partially randomized multilayer structures are calculated. A method of calculation that was proposed and demonstrated earlier, for the model of a superlattice with a harmonic dependence of its material parameters along its axis in the initial state, is extended to the case of a multilayer structure (i.e., a superlattice with sharp interfaces). One- and three-dimensional random modulations of the period are considered, and the correlation function of the superlattice is derived as a series in which each term is a product of a harmonic and a monotonically decaying function. The law of decay of the correlation function is Gaussian for smooth inhomogeneities, and has different forms for one- and three-dimensional short-wavelength inhomogeneities. The spectrum and
damping
of waves in the superlattice described by this correlation function are found in the weak-coupling approximation in the vicinities of all of the odd Brillouin zone boundaries. Analytical dependences of the main characteristics of the spectrum and
damping
on the zone number n are obtained. The conditions for the closing of the gaps at the Brillouin zone boundaries are derived, and depend on the dimensionality of the inhomogeneities and the degree of their smoothness.
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Mankov Y. I.
Заглавие
: Effects of cross correlations between 1D and 3D inhomogeneities on the high-frequency susceptibility of superlattices
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 102, Is. 4. - P625-635. - ISSN 1063-7761,
DOI
10.1134/S106377610604011X
Примечания
: Cited References: 29
Предметные рубрики:
ELASTIC MEDIUM THEORY
3-DIMENSIONAL INHOMOGENEITIES
PERIODIC MULTILAYERS
SPIN-WAVES
LOCALIZATION
SPECTRUM
SYSTEMS
MEDIA
DISORDER
Ключевые слова
(''Своб.индексиров.''): correlation methods--
damping
--function evaluation--wave equations--brillouin zone--distribution function--random variables--superlattices
Аннотация:
Cross Correlations between components of a mixture of one-dimensional (I D) and three-diniensional (3D) inhomogenetics are described by introducing a distribution function taking into account correlations between absolute values of two random variables in the absence of correlations between the variables themselves. This distribution function is used for derivation and analysis of the superlattice correlation function containing a mixture of cross-correlated 1D and 3D in homogeneitics. The effect of such inhomogeneities on the high-frequency susceptibility at the edge of the first Brillouin zone of the superlattice is investigated. It is shown that positive cross correlations partly suppress the effect of a mixture of 1D and 3D inhomogeneities on the wave spectrum: the gap at the boundary of the Brillouin zone increases, and wave
damping
decreases as compared to the effect produced by a mixture of 1D and 3D inhomogeneities in the absence of cross correlations. Negative cross correlations lead to the opposite effect: the gap decreases and wave
damping
increases. Cross correlations also lead to the emergence of new resonance effects: a narrow dip or a narrow peak at the center of the band gap (depending on the sign of the correlation factor).
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7.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Bulgakov E. N., Sadreev A. F.
Заглавие
: Spin-wave
damping
in uniaxial ferromagnets at the orientational phase-transition
Место публикации
: Phys. Status Solidi B. - 1986. - Vol. 138, Is. 2. - P.521-530. - ISSN 0370-1972,
DOI
10.1002/pssb.2221380216
Примечания
: Cited References: 15
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Polukhin D. S.
Заглавие
: Effects of cross correlations between exchange and magnetic-anisotropy inhomogeneities on the spectrum and
damping
of spin waves
Коллективы
: Russian Federation for the Support of Leading Scientific Schools [3818.2008.3]
Место публикации
: Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 51, Is. 5. - P940-948. - ISSN 1063-7834,
DOI
10.1134/S1063783409050096
Примечания
: Cited References: 9. - This study was supported in part by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools (project no. 3818.2008.3).
Аннотация:
Effects of cross correlations between inhomogeneities of the exchange and magnetic-anisotropy parameters on the spectrum and
damping
of spin waves in a ferromagnet are investigated. One- and three-dimensional inhomogeneities are considered. It is demonstrated that the positive cross correlations lead to an increase in the modification of the dispersion law and the
damping
of spin waves. The negative cross correlations result in the opposite effects: a decrease in the modification of the dispersion law and a decrease in the
damping
of spin waves. A comparison of the specific features revealed in this work and the results of targeted experimental investigations of modifications of the dispersion laws and
damping
in inhomogeneous magnets would make it possible to determine the contribution of the cross correlations to the formation of the stochastically inhomogeneous ground state in amorphous magnetic alloys.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Balaev D. A., Dubrovskii A. A., Shaikhutdinov K. A., Popkov S. I., Gokhfeld D. M., Gokhfeld Yu. S., Petrov M. I.
Заглавие
: Mechanism of the hysteretic behavior of the magnetoresistance of granular HTSCs: The universal nature of the width of the magnetoresistance hysteresis loop
Коллективы
: Quantum Macrophysics of the Russian Academy of Sciences [3.4]; Krasnoyarsk Regional Science Foundation [18G011]; Foundation for Supporting National Science Projects
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009. - Vol. 108, Is. 2. - P241-248. - ISSN 1063-7761,
DOI
10.1134/S106377610902006X
Примечания
: Cited References: 32. - This study was carried out under the program "Quantum Macrophysics" of the Russian Academy of Sciences and complex integration project no. 3.4 of the Siberian Branch of the Russian Academy of Sciences, and was partly supported by the Krasnoyarsk Regional Science Foundation (grant no. 18G011). D. A. B. and A. A. D. are grateful to the Foundation for Supporting National Science Projects.
Предметные рубрики:
CRITICAL-CURRENT-DENSITY
HIGH-TEMPERATURE SUPERCONDUCTOR
CURRENT-VOLTAGE CHARACTERISTICS
EXTERNAL MAGNETIC-FIELD
BA-CU-O
JOSEPHSON MEDIUM
CRITICAL-STATE
FLUX
COMPOSITES
YBA2CU3O7-DELTA
Ключевые слова
(''Своб.индексиров.''): barium--calcium--
damping
--electric resistance--high temperature superconductors--magnetic field effects--magnetic materials--magnetoelectronics--magnetoresistance--stiffness--classical systems--critical densities--experimental datum--external conditions--flux trapping--hysteretic behaviors--josephson vortices--residual resistances--transport currents--universal behaviors--y-ba-cu-o--hysteresis
Аннотация:
The hysteretic behavior of the magnetoresistance R(H) of granular high-temperature superconductors (HTSCs) of the Y-Ba-Cu-O, Bi-Ca-Sr-Cu-O, and La-Sr-Cu-O classical systems is investigated for transport current densities lower and higher than the critical density (at H = 0). All systems exhibit universal behavior of the width of the magnetoresistance hysteresis loop: independence of transport current under identical external conditions. This means that flux trapping in HTSC grains is the main mechanism controlling the hysteretic behavior of the magnetoresistance of granular HTSCs, while pinning of Josephson vortices in the intragranular medium makes no appreciable contribution to the formation of magnetoresistance hysteresis (when transport current flows through the sample). Experimental data on relaxation of residual resistance after the action of a magnetic field also confirm this conclusion.
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10.
Вид документа
: Статья из сборника (выпуск монографической серии)
Шифр издания
:
Автор(ы)
: Govorun I. V., Leksikov A. A., Serzhantov A. M.
Заглавие
: Features of the coupling coefficients of microstrip irregular quarter-wavelength resonators
Коллективы
: International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering
Место публикации
: 13th International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering (APEIE): IEEE, 2017. - Vol. 4. - P.29-32. - (International Conference on Actual Problems of Electronic Instrument)
Примечания
: Cited References:9
Предметные рубрики:
HAIRPIN RESONATORS
Ключевые слова
(''Своб.индексиров.''): microstrip resonator--coupling coefficient--inductive and capacitive--interactions--
damping
pole
Аннотация:
In the present work on the base of modified energy approach a behavior of the frequency-dependent coupling coefficient of pair microstrip stepped-impedance quarter-wavelength resonators was investigated. It is revealed that at a certain gap between the resonators the total coefficient of coupling becomes zero due to mutual compensation of coefficients describing inductive and capacitive interactions between the resonators.
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11.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Govorun I. V., Leksikov A. A., Serzhantov A. M.
Заглавие
: Compact microwave power limiter with htsc element
Место публикации
: J. Sib. Fed. Univ. Math. Phys. - 2018. - Vol. 11, Is. 1. - P.35-39. - ISSN 19971397 (ISSN),
DOI
10.17516/1997-1397-2018-11-1-35-39; Журн. СФУ. Сер. "Математика и физика"
Примечания
: Cited References: 9. - The work was supported by the Ministry of Education and Science of the Russian Federation, grant СП-3036.2016.3. of the President of the Russian Federation for State Support of Young Russian Scientists.
Ключевые слова
(''Своб.индексиров.''): power limiter--microwave--
damping
pole--microstripe structure--htsc--ограничитель мощности--свч--полюс затухания--микрополосковая структура--втсп
Аннотация:
A design of microwave power limiter having a structure of three-pole microstrip filter is developed. In the device outer resonators are coupled through an inner resonator containing high-temperature super- conducting film. Prototype of the device with central frequency 7.9 GHz and relative bandwidth 9% has insertion loss 1.5 dB in the open state and suppress a signal not less 30 dB in the limitation state.Была разработана конструкция ограничителя СВЧ-мощности, имеющая структуру трехзвенного микрополоскового фильтра. В устройстве внешние резонаторы связаны посредством внутреннего, содержащего ВТСП-пленку. Макет устройства с центральной частотой 7.9 ГГц и относительной полосой пропускания 9% имеет потери 1.5 дБ в открытом состоянии и не менее 30 дБ ослабления в режиме ограничения.
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12.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Govorun I. V., Leksikov A. A.
Заглавие
: New method for observation ferromagnetic resonance spectra
Коллективы
: International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering, Institute of Electrical and Electronics Engineers
Место публикации
: 14th International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering, APEIE 2018: Proceedings. - 2018. - P.41-44. - ISBN 9781538670545,
DOI
10.1109/APEIE.2018.8545359
Примечания
: Cited References: 8
Предметные рубрики:
Magnetomechanical effects
Magnetic films
Magnetic fields
Ключевые слова
(''Своб.индексиров.''): microstrip resonator--coupling coefficient--ferromagnetic resonance--
damping
pole
Аннотация:
A new method for observation of ferromagnetic resonance spectra is demonstrated. Its operation based on the registering a
damping
pole in the frequency response of two-resonator microstrip structure containing a sample under investigation. A
damping
pole arises due to mutual compensation of capacitive (electric) and inductive (magnetic) interactions between the resonators and this compensation get broken in the ferromagnetic resonance.
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Izotov A. V., Belyaev B. A., Boev N. M., Burmitskikh A. V., Leksikov An. A., Skomorokhov G. V., Solovev P. N.
Заглавие
: Tailoring the microwave properties of thin permalloy films using a periodically grooved substrate
Коллективы
: Ministry of Science and Higher Education of the Russian Federation [075-11-2019054]
Место публикации
: Physica B. - 2022. - Vol. 629. - Ст.413654. - ISSN 0921-4526,
DOI
10.1016/j.physb.2021.413654. - ISSN 1873-2135(eISSN)
Примечания
: Cited References: 50. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation, agreement number 075-11-2019054 dated November 22, 2019
Предметные рубрики:
FERROMAGNETIC-RESONANCE
MAGNETIC-PROPERTIES
ANISOTROPY
FREQUENCY
Аннотация:
Thin magnetic films with periodic surface topography are of special interest for microwave applications as their static and dynamic magnetic characteristics can be readily adjusted. In this paper, we explore the capabilities of a simple method for producing large-area periodically patterned films by creating regularly spaced grooves on a substrate using a diamond cutter. For 110-nm-thick films, it was found that the substrate-topography-induced magnetic anisotropy was inversely proportional to the pattern period, which in experimental samples varied from 5 to 20 mu m. Based on the Netzelmann theory, analytical expressions for demagnetization tensor components were obtained, which accord well with the experimental data. The measurements of the natural ferromagnetic resonance spectra demonstrated that the increase of the topography-induced magnetic anisotropy with the decrease of the pattern period led to the increase of the resonance frequency from 0.65 to 1.86 GHz, and to a decrease of the linewidth and effective
damping
parameter.
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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ignatchenko V. A., Polukhin D. S.
Заглавие
: Effects of cross correlations between inhomogeneities of the parameters of an isotropic medium on the spectrum and
damping
of elastic waves
Место публикации
: J. Exp. Theor. Phys. - NEW YORK: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 110, Is. 2. - С. 345-359. - FEB. - ISSN 1063-7761,
DOI
10.1134/S1063776110020184
Примечания
: Cited Reference Count: 17. - Гранты: This study was supported in part by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools (grant no. 3818.2008.3) and the Presidium of the Russian Academy of Sciences (program no. 27.1) and performed within the framework of the Federal Target Program (State Contract no. 02.740.11.0220).Финансирующая организация: Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools [3818.2008.3]; Presidium of the Russian Academy of Sciences [27.1]; Federal Target Program [02.740.11.0220]
Ключевые слова
(''Своб.индексиров.''): cross correlations--dispersion law--elastic force--inhomogeneities--isotropic medium--negative cross-correlation--physical nature--two parameter--wave spectra--
damping
--dispersions--elastic waves--hamiltonians--dispersion (waves)
Аннотация:
The dispersion and
damping
laws have been investigated for elastic waves in an isotropic medium with one- and three-dimensional inhomogeneities of the density p(x) of the material and the elastic force constants mu(x) and lambda(x) with allowance for the cross correlations between these inhomogeneities. It has been demonstrated that the positive cross correlations between mu(x) and lambda(x), as well as the negative cross correlations between p(x) and mu(x) or p(x) and lambda(x), lead to an enhancement of the modification of the dispersion law and an increase in the
damping
of waves. The positive cross correlations between p(x) and mu(x) or p(x) and lambda(x), as well as the negative cross correlations between mu(x) and lambda(x), result in the opposite effects: a weakening of the modification of the dispersion law and a decrease in the
damping
. An analysis of the results obtained in this paper and in our recent work [15] has made it possible to formulate the general regularity of the effects of cross correlations, irrespective of the physical nature of the waves: the effects of cross correlations between inhomogeneities of any two parameters of the material on the wave spectrum depend on whether both parameters related by the cross correlations belong to the same part of the Hamiltonian (i.e., if they both belong to either the kinetic part or the potential part of the Hamiltonian) or they belong to different parts of the Hamiltonian. The positive cross correlations lead to a greater modification of the dispersion law and to an increase in the
damping
of waves in the former case and to a decrease in these characteristics in the latter case. Correspondingly, the negative cross correlations in each of these cases result in the opposite effects. This regularity has been explained qualitatively.
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15.
Вид документа
: Статья из сборника (однотомник)
Шифр издания
:
Автор(ы)
: Ignatchenko V.A.
Заглавие
: Effects of cross correlation between inhomogeneities on the spectum and
damping
of spin and elastic waves (invited)
Коллективы
: "Functional Materials", International Conference
Место публикации
: International Conference "Functional Materials" (ICFM-09): book of abstracts : October 5-10, Ukraine, Crimea, Partenit. - 2009. - С. 281
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