SPIN-WAVE INSTABILITIES, AUTOOSCILLATIONS, AND CHAOS IN YTTRIUM-IRON-GARNET

被引：75
|
作者：
REZENDE, SM
DEAGUIAR, FM
机构：
[1] Departamento de Fisica, Universidade Federal de Pernambuco
来源：
PROCEEDINGS OF THE IEEE | 1990年 / 78卷 / 06期
关键词：
Auto-Oscillations - Chaotic Dynamics - Microwave Fields - Nonlinear Dynamics - Spin-Wave Pumping - Yttrium-Iron-Garnet;
D O I：
10.1109/5.56906
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Spin-wave instabilities driven by microwave fields display autooscillations, intermrttency, quasiperiodicity, perrod-doubling and chaos like other nonlinear dynamic systems. Several of these phenomena, first observed nearly 30 year ago, only recently have been investigated systematically and understood in the light of modern nonlinear dynamics. We review recent experimental results in yttrium- iron-garnet subject to three drfferent sprn-wave pumping mechanisms: parallel pumping, subsidiary resonance (first-order Suhl process) and premature saturatron of the main resonance (second-order Suhl process). A theoretical model derived from first principles leading to coupled nonlinear spin-wave equations is used to interpret the observed sprn-wave instabilities, auto-oscillations, and chaotic dynamics. lmprovements needed in the model are also indicated. © 1990 IEEE
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页码：893 / 908
页数：16
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