非平衡スピン系の非線形ダイナミクス

概要

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Ordering processes in XY spin systmes with uniaxial anisotropy in 1 and 2 dimensions where the existence of Ising walls and Bloch walls play important roles, are briefly discussed. In particular, for the 1-D system we propose a set of randomly distributed interacting magnetic walls, and derive an analytic expression for the velocity of magnetic walls with small curvature values. We also discuss nonlinear-dynamic behaviors of Ising and XY spin systems in strong oscillating magnetic fields. It is reported that for a sufficiently strong field, as the frequency of the applied field is changed, the Ising system manifests a phase transition between symmetry-restoring and symmetry-breaking oscillations. Statistical properties near the transition are studied. It is also shown that the XY model manifests a transition between Ising-type symmetry-restoring oscillation and XY-type symmetry-restoring oscillation.
社団法人日本磁気学会の論文
2001-09-01