论文标题
在Fe $ _ {0.75} $ co $ _ {0.25} $ si中，热兴奋的旋转动力学在fe $ _ {0.75}中
Optically excited spin dynamics of thermally metastable skyrmions in Fe$_{0.75}$Co$_{0.25}$Si
论文作者
论文摘要
我们研究了Cutic手性磁铁Fe $ _ {0.75} $ co $ _ {0.25} $ SI的微波自旋激发，这是由激光加热的热调制驱动的，并通过磁磁性磁极kerr效应的时间分辨测量结果进行了探测。将关注拓扑非平凡的天际晶格状态的热力学平衡中的动态特性与通过快速场冷却制备的亚稳态状态的动态特性进行了比较。在这两种情况下，我们都发现对动态响应的预级和指数贡献，分别是呼吸模式和能量耗散的特征。当考虑到通用缩放与温度的函数时，平衡和亚稳态的天空状态中的进动频率具有良好的定量一致性。这一发现强调了天空状态远非热平衡有望极大的灵活性，例如，对于可能的微波应用以及对基本特性的研究，在温度和田间尺度方面。
We investigate the microwave spin excitations of the cubic chiral magnet Fe$_{0.75}$Co$_{0.25}$Si as driven by the thermal modulation of magnetic interactions via laser heating and probed by time-resolved measurements of the magneto-optical Kerr effect. Focusing on the topologically nontrivial skyrmion lattice state, the dynamic properties in thermodynamic equilibrium are compared with those of a metastable state prepared by means of rapid field cooling. In both cases, we find precessional and exponential contributions to the dynamic response, characteristic of a breathing mode and energy dissipation, respectively. When taking into account the universal scaling as a function of temperature, the precession frequencies in the equilibrium and metastable skyrmion state are in excellent quantitative agreement. This finding highlights that skyrmion states far from thermal equilibrium promise great flexibility, for instance with respect to temperature and field scales, both for possible microwave applications and the study of fundamental properties.
