The motion of domain walls in ferrimagnets near the sublattice spin compensation point is studied theoretically, when there is an exchange enhancement in the limiting velocity of the wall. Nonlinear regimes of high-velocity nonstationary wall motion are found. A magnet parameter region in which the collective variable approach is invalid, is detected. In this region, the wall motion is accompanied by the periodic appearance of instability with respect to the increase in spin oscillations inside the domain wall.

中文翻译：

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自旋补偿点附近亚铁磁体中畴壁的非平稳强迫运动

理论上研究了亚晶格自旋补偿点附近亚晶格自旋补偿点的畴壁运动，当壁的极限速度存在交换增强时。发现了高速非平稳壁运动的非线性状态。检测集体变量逼近无效的磁体参数区域。在该区域中，壁运动伴随着与畴壁内自旋振荡的增加有关的不稳定性的周期性出现。