Magnetization switching in ferromagnetic structures is an important process for technical applications such as data storage in spintronics, and therefore the determination of the corresponding switching rates becomes essential. We investigate a free-layer system in an oscillating external magnetic field resulting in an additional torque on the spin. The magnetization dynamics including inertial damping can be described by the phenomenological Gilbert equation. The magnetization switching between the two stable orientations on the sphere then requires the crossing of a potential region characterized by a moving rank-1 saddle. We adopt and apply recent extensions of transition state theory for driven systems to compute both the time-dependent and average switching rates of the activated spin system in the saddle region.

铁磁结构中的磁化开关是技术应用（例如自旋电子学中的数据存储）的重要过程，因此确定相应的开关速率变得至关重要。我们研究了振荡外部磁场中的自由层系统，导致自旋上的额外扭矩。包括惯性阻尼的磁化动力学可以通过现象学吉尔伯特方程来描述。然后，球体上两个稳定方向之间的磁化转换需要跨越以移动的 1 级鞍座为特征的潜在区域。我们采用并应用了驱动系统过渡态理论的最新扩展，以计算鞍区激活自旋系统的时间相关和平均切换率。