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    Новый метод измерения спектров ФМР / И. В. Говорун [и др.] // Изв. вузов. Физика. - 2015. - Т. 58, № 8/2. - С. 78-80. - Библиогр.: 5. - Работа выполнена при поддержке Министерства образования и науки РФ, соглашение №14-607-21-0039 . - ISSN 0021-3411
   Перевод заглавия: New technique for measuring FMR spectra
Кл.слова (ненормированные):
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.

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Говорун, Илья Валерьевич; Govorun, I. V.; Лексиков, Александр Александрович; Leksikov, Al. A.; Лексиков, Андрей Александрович; Leksikov, An. A.; Бабурин, А. С.
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Ignatchenko, V. A.
Effect of cross correlations between inhomogeneities on the spectrum and damping of spin and elastic waves / V. A. Ignatchenko, D. S. Polukhin // Low Temp. Phys. - 2010. - Vol. 36, Is. 8-9. - P. 741-746 ; Физика низких температур, DOI 10.1063/1.3490860. - 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. . - ISSN 1063-777X

РУБ Physics, Applied
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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Держатели документа:
[Ignatchenko, V. A.
Polukhin, D. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН
L. V. Kirenskii Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Игнатченко, Вальтер Алексеевич

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Ignatchenko, V. A.
Effects of cross correlations between inhomogeneities of the parameters of an isotropic medium on the spectrum and damping of elastic waves / V. A. Ignatchenko, D. S. Polukhin // J. Exp. Theor. Phys. - 2010. - Vol. 110, Is. 2. - P. 345-359, DOI 10.1134/S1063776110020184. - 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). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary

Кл.слова (ненормированные):
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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Держатели документа:
[Ignatchenko, V. A.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Polukhin, D. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, pr. Svobodny 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Игнатченко, Вальтер Алексеевич
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Symmetry breaking in a driven and strongly damped pendulum / J. . Isohatala [et al.] // Phys. Rev. E. - 2005. - Vol. 71, Is. 6. - Ст. 66206, DOI 10.1103/PhysRevE.71.066206. - Cited References: 37 . - ISSN 1539-3755

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
DC VOLTAGE GENERATION
   SEMICONDUCTOR SUPERLATTICES
   JOSEPHSON-JUNCTIONS
   BLOCH OSCILLATIONS
   FORCED PENDULUM
   CHAOS
   FREQUENCY
   SYSTEMS
   RECTIFICATION
   STANDARD
Кл.слова (ненормированные):
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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Держатели документа:
Univ Oulu, Dept Phys Sci, FIN-90014 Oulu, Finland
LV Kirenskii Inst Phys, Theory Nonlinear Proc Lab, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Physical Sciences, P. O. Box 3000, Oulu FIN-90014, Finland
Theory of Nonlinear Processes Laboratory, Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Isohatala, J.; Alekseev, K. N.; Kurki, L. T.; Pietilainen, P.
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Ignatchenko, V. A.
The spectrum and damping of waves in partially randomized multilayers / V. A. Ignatchenko, Y. I. Mankov, A. A. Maradudin // J. Phys.: Condens. Matter. - 1999. - Vol. 11, Is. 13. - P. 2773-2790, DOI 10.1088/0953-8984/11/13/013. - Cited References: 24 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
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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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Calif Irvine, Irvine, CA 92697 USA
ИФ СО РАН
L V Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
University of California, Irvine, CA 92697 4575, United States

Доп.точки доступа:
Mankov, Y. I.; Maradudin, A. A.; Игнатченко, Вальтер Алексеевич
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Ignatchenko, V. A.
Effects of cross correlations between 1D and 3D inhomogeneities on the high-frequency susceptibility of superlattices / V. A. Ignatchenko, Y. I. Mankov // J. Exp. Theor. Phys. - 2006. - Vol. 102, Is. 4. - P. 625-635, DOI 10.1134/S106377610604011X. - Cited References: 29 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
ELASTIC MEDIUM THEORY
   3-DIMENSIONAL INHOMOGENEITIES
   PERIODIC MULTILAYERS
   SPIN-WAVES
   LOCALIZATION
   SPECTRUM
   SYSTEMS
   MEDIA
   DISORDER
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Mankov, Y. I.; Игнатченко, Вальтер Алексеевич
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Bulgakov, E. N.
Spin-wave damping in uniaxial ferromagnets at the orientational phase-transition / E. N. Bulgakov, A. F. Sadreev // Phys. Status Solidi B. - 1986. - Vol. 138, Is. 2. - P. 521-530, DOI 10.1002/pssb.2221380216. - Cited References: 15 . - ISSN 0370-1972

РУБ Physics, Condensed Matter

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Держатели документа:
L. V. Kirenskii Inst of Physics, Krasnoyarsk, USSR, L. V. Kirenskii Inst of Physics, Krasnoyarsk, USSR
ИФ СО РАН
Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Ignatchenko, V. A.
Effects of cross correlations between exchange and magnetic-anisotropy inhomogeneities on the spectrum and damping of spin waves / V. A. Ignatchenko, D. S. Polukhin // Phys. Solid State. - 2009. - Vol. 51, Is. 5. - P. 940-948, DOI 10.1134/S1063783409050096. - 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). . - ISSN 1063-7834

РУБ Physics, Condensed Matter

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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Держатели документа:
[Ignatchenko, V. A.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Polukhin, D. S.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Svobodny pr. 79, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Polukhin, D. S.; Полухин, Дмитрий Сергеевич; Игнатченко, Вальтер Алексеевич; Russian Federation for the Support of Leading Scientific Schools [3818.2008.3]
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Mechanism of the hysteretic behavior of the magnetoresistance of granular HTSCs: The universal nature of the width of the magnetoresistance hysteresis loop / D. A. Balaev [et al.] // J. Exp. Theor. Phys. - 2009. - Vol. 108, Is. 2. - P. 241-248, DOI 10.1134/S106377610902006X. - 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. . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
CRITICAL-CURRENT-DENSITY
   HIGH-TEMPERATURE SUPERCONDUCTOR
   CURRENT-VOLTAGE CHARACTERISTICS
   EXTERNAL MAGNETIC-FIELD
   BA-CU-O
   JOSEPHSON MEDIUM
   CRITICAL-STATE
   FLUX
   COMPOSITES
   YBA2CU3O7-DELTA
Кл.слова (ненормированные):
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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Держатели документа:
[Balaev, D. A.
Dubrovskii, A. A.
Shaikhutdinov, K. A.
Popkov, S. I.
Gokhfeld, D. M.
Gokhfeld, Yu. S.
Petrov, M. I.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Dubrovskii, A. A.; Дубровский, Андрей Александрович; Shaikhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Popkov, S. I.; Попков, Сергей Иванович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Gokhfeld, Yu. S.; Гохфельд, Юлия Сергеевна; Petrov, M. I.; Петров, Михаил Иванович; Quantum Macrophysics of the Russian Academy of Sciences [3.4]; Krasnoyarsk Regional Science Foundation [18G011]; Foundation for Supporting National Science Projects
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10.

Govorun, I. V.
Features of the coupling coefficients of microstrip irregular quarter-wavelength resonators / I. V. Govorun, A. A. Leksikov, A. M. Serzhantov // 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). - Cited References:9 . -

РУБ Engineering, Electrical & Electronic + Instruments & Instrumentation
Рубрики:
HAIRPIN RESONATORS
Кл.слова (ненормированные):
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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Доп.точки доступа:
Leksikov, A. A.; Serzhantov, A. M.; Сержантов, Алексей Михайлович; Говорун, Илья Валерьевич; International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering(13 ; 3-6 Oct. 2016 ; Novosibirsk, Russia)
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