Chaos in Spin-Wave Instabilities : Theory and Experiments : Part III. Experimental Aspects : New Trends in Chaotic Dynamics of Hamiltonian Systems
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概要
- 論文の詳細を見る
Parametric excitation of spin-waves with high microwave power causes spin-wave instability where number of spin-waves grows exponentially with time beyond thermal level. Above the spin-wave instability threshold, auto-oscillations of magnon number which include cascade of period-doubling bifurcations, chaos, periodic window and period-halving have been experimentally observed. From experimental time-series data, return maps, fractal dimensions, positive Lyapunov exponents, phase space portraits of strange attractors and two-dimensional Poincare sections are obtained. A theoretical model of chaos due to nonlinear four-magnon interaction under parallel pumping is given. Numerical solutions display a rich variety of periodic and chaotic trajectories. A multi-fractal structure, singularity spectrum f(a), is numerically studied for two modes model which includes a microwave cavity mode.
- 理論物理学刊行会の論文
- 1989-10-31
著者
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YAMAZAKI Hitoshi
Department of Physics,Faculty of Science,Okayama University
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Mino Michinobu
Department of Physics, Okayama University
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Yamazaki Hitoshi
Department Of Ophthalmology Hirosaki University School Of Medicine
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YAMAZAKI Hidetomo
Department of Physics, Kyoto Sangyo University
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Mino M
Okayama Univ. Okayama
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Mino Michinobu
Department Of Physics Faculty Of Science Okayama University
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Mino Michinobu
Department Of Physics Okayama University
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Yamazaki Hitoshi
Department Of Ophthalmology Hirosaki University Graduate School Of Medicine
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Yamazaki Hitoshi
Department Of Physics Okayama University
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YAMAZAKI Hideki
Kyushu Institute of Technology, Department of Electrical Engineering
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