Analysis of chaotic bright spin-wave soliton trains in magnetic films

[摘要] We have experimentally studied a chaotic dynamics of bright spin-wave soliton trains. Thin yttrium iron garnet films having pinned surface spins were used for the experiments providing propagation of highly dispersive dipole-exchange spin waves. Chaotic soliton trains were excited in the frequency band around low-frequency part of dipole gap of spin wave spectrum. Analysis of fractal dimension, embedding dimension, and Lyapunov exponents was carried out based on measured time profiles of chaotic soliton sequences. We find that the fractal dimension and Lyapunov exponents are weak function of carrier frequency around dipole gap whereas embedding dimension is almost constant.

[发布机构] St. Petersburg Electrotechnical University, St. Petersburg; 197376, Russia^1;ITMO University, St. Petersburg; 197101, Russia^2

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Analysis of fractals;Carrier frequency;Chaotic dynamics;Dipole-exchange spin waves;Embedding dimensions;Lyapunov exponent;Spin-wave spectrum;Yttrium iron garnet films