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Title: Nonlinear dynamic magnetization regimes in (100) ferrite-garnet films

Abstract

To study the nonlinear dynamics of a uniformly precessing magnetization in perpendicularly magnetized (100) ferrite-garnet films, equations of motion are numerically solved over a wide ac field frequency range. Bifurcation changes in the magnetization precession and the states of dynamic bistability have been detected. The conditions of high-amplitude regular and stochastic dynamic regimes are revealed, and the possibilities of controlling these precession regimes by applied magnetic fields are shown.

Authors:
;  [1]
  1. Ul'yanovsk State University (Russian Federation), E-mail: sementsovdi@ulsu.ru
Publication Date:
OSTI Identifier:
21072477
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 104; Journal Issue: 5; Other Information: DOI: 10.1134/S106377610705010X; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AMPLITUDES; BIFURCATION; EQUATIONS OF MOTION; FERRITE GARNETS; FREQUENCY RANGE; MAGNETIC FIELDS; MAGNETIZATION; NONLINEAR PROBLEMS; STOCHASTIC PROCESSES; THIN FILMS

Citation Formats

Shutyi, A. M., E-mail: shuty@mail.ru, and Sementsov, D. I.. Nonlinear dynamic magnetization regimes in (100) ferrite-garnet films. United States: N. p., 2007. Web. doi:10.1134/S106377610705010X.
Shutyi, A. M., E-mail: shuty@mail.ru, & Sementsov, D. I.. Nonlinear dynamic magnetization regimes in (100) ferrite-garnet films. United States. doi:10.1134/S106377610705010X.
Shutyi, A. M., E-mail: shuty@mail.ru, and Sementsov, D. I.. Tue . "Nonlinear dynamic magnetization regimes in (100) ferrite-garnet films". United States. doi:10.1134/S106377610705010X.
@article{osti_21072477,
title = {Nonlinear dynamic magnetization regimes in (100) ferrite-garnet films},
author = {Shutyi, A. M., E-mail: shuty@mail.ru and Sementsov, D. I.},
abstractNote = {To study the nonlinear dynamics of a uniformly precessing magnetization in perpendicularly magnetized (100) ferrite-garnet films, equations of motion are numerically solved over a wide ac field frequency range. Bifurcation changes in the magnetization precession and the states of dynamic bistability have been detected. The conditions of high-amplitude regular and stochastic dynamic regimes are revealed, and the possibilities of controlling these precession regimes by applied magnetic fields are shown.},
doi = {10.1134/S106377610705010X},
journal = {Journal of Experimental and Theoretical Physics},
number = 5,
volume = 104,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • This paper reports on a study of the composition of complex ferritegarnet films, for example, films of (YSmLuCa)/sub 3/ (FeGe)/sub 5/O/sub 12/, (YSmTuCa)/sub 3/ (Fe Ge)/sub 5/O/sub 12/, and others of gallium halide substrate. Data indicate that the process of etching gallium halide garnets lies in the kinetic domain. This means that the etching rate is limited by the chemical transformation rate and depends strongly on temperature. To perform layer-by-layer etching, this dependence must therefore be be determined and etching conditions chosen that provide adequate process reproducibility and an ideal surface microstructure. The effect of thermal processes on the supplymore » of rare earth elements to a spark discharge plasma from a small volume of a concentrated solution discussed. Conditions for the analysis of ferrite-garnet epitaxial films are described that eliminate the errors caused by the effect of differences in the thermodynamic properties of rare earth compounds on the intensity ratios of analytical line pairs.« less
  • Thin films of iron oxide, nickel oxide, cobalt oxide, strontium hexagonal ferrite, and yttrium iron garnet have been grown by laser ablation. With the exception of Co{sub 3}O{sub 4} deposited on LaAlO{sub 3}, the first three materials deposited on [100] LaAlO{sub 3}, SrTiO{sub 3}, and MgO result in high quality {ital c} axis [100] growth. Co{sub 3}O{sub 4} deposited on LaAlO{sub 3} produces highly oriented but random in-plane growth. Similar highly oriented but random in-plane growth occurs for all three materials deposited on glass. The same three materials deposited on cubic zirconia grow [111] oriented and twinned. Strontium hexagonal ferritemore » and yttrium iron garnet have been deposited on [111] large lattice constant garnet. Epitaxial [0001] films are obtained for the former while the latter gives [111]-oriented films. For yttrium iron garnet the closeness of lattice match to the substrate necessitates that the mosaicity (rocking curves) obtained from area maps be compared to the growth temperatures and pressures to determine the optimum growth conditions for epitaxiality. {copyright} {ital 1996 American Institute of Physics.}« less
  • A method is given for determining the sign of the lattice-parameter discrepancy between film and substrate for single-crystal garnet-ferrite films grown by liquid-phase epitaxy from a supercooled melt. The sign is judged from the sizes of the single-crystal blocks at the edge and at the center of the cracked epitaxial film or in two films grown simultaneously on the two sides of the substrate.
  • The factors affecting the slope of the dispersion curve of the spin-wave resonance spectrum in multilayer films are determined. It is shown that an increase in the slope of the curve for the transverse orientation of the constant magnetic field relative to the film upon an increase in frequency is due to enhancement of dynamic as well as dissipative mechanisms of spin pinning. It is found that an increase in the damping parameter increases the degree of spin pinning in the case when the pinning layer is a reactive medium for spin oscillations and can decrease the degree of pinningmore » when it is a dispersive medium. The conditions ensuring a higher degree of accuracy in determining the exchange interaction constant from the spin-wave resonance spectrum in multilayer films are determined.« less
  • Magnetic garnet films of compositions (YBi){sub 3}Fe{sub 5}O{sub 12} and (LuBi){sub 3}Fe{sub 5}O{sub 12} are grown by liquid-phase epitaxy on [110]- and [100]-oriented substrates of gadolinium gallium garnet, respectively. All films have in-plane magnetization. 180{degree} and 90{degree} domain walls in these films are studied by microwave technique. In addition to the known low-frequency mode of wall translation new multiple resonant modes of both 90{degree} and 180{degree} domain walls with very small linewidth (4.2 MHz) are observed at frequencies near 1 GHz. Resonances are effectively excited by an rf magnetic field which is parallel or perpendicular to the wall plane. Resonancemore » frequencies are shown to have nonlinear dispersion dependence on the mode number: they decrease with increasing in-plane magnetic field normal to the wall plane. {copyright} {ital 1996 The American Physical Society.}« less