Chaotic regimes of antiferromagnetic resonance in a quasi-two-dimensional easy-axis antiferromagnet (NH_3)_2 (CH_2)_4 MnCl_4

Details Chaotic regimes of antiferromagnetic resonance in a quasi-two-dimensional easy-axis antiferromagnet (NH_3)_2 (CH_2)_4 MnCl_4 Chaotic regimes of antiferromagnetic resonance in a quasi-two-dimensional easy-axis antiferromagnet (NH_3)_2 (CH_2)_4 MnCl_4

2001-04-11

arxiv.org/abs/nlin/0104032v1

Fiz.Nizk.Temp.V.25, N3, pp.263-276 (1999)(in Russian), Low Temperature Physics, V.25, N3,pp.192-202 (1999)(in English)

Nonlinear Sciences

Chaotic Dynamics

LaTeX, 25 pages, 12 GIF figures, the paper was published in Fiz.Nizk.Temp. (in Russian), Low Temperature Physics (in English)

Scientific paper

Chaotic regimes of the microwave energy absorption are experimentally observed and analyzed for two-dimensional metallorganic antiferromagnet (NH_3)_2(CH_2)_4MnCl_4 at low temperatures under the conditions of nonlinear antiferromagnetic resonance. Relaxation oscillations of energy absorption are investigated in detail. Their frequency spectra, frequency-amplitude characteristics, and dependences of absorbed power on driving power and static magnetic field are studied. It is shown that the dynamics of relaxation oscillations undergoes a transition to chaos by "irregular periods". Peculiarities of the transition are described consistently. Among other things, the conditions for the emergence of energy absorption regimes with a spike-like and a saw-tooth signal structure are determined, and the characteristics of chaotic oscillations such as the dimensions of strange attractors are calculated. The chaotic dynamics is found to be high-dimensional with a large contribution from noise which is of deterministic origin in the antiferromagnet under investigation.

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