Abstract
The magnetization dynamics of a square magnet in a pillar structure under the influence of a dc spin current is studied by micromagnetic simulation based on the modified Landau-Lifshitz-Gilbert equation. Even in the situation with neither external field perturbation nor thermal activation, the magnetization exhibits intricate behaviors ranging from static configurations to periodic domain wall rotations to chaotic processes. It arises from the nonlinearity of the spin-transfer torque and is explained by the excitation of nonlinear spin waves in the magnet.
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