Understanding the magnetization switching process in ferromagnetic thin films is essential for many technological applications. We investigate the effects of periodic driving via magnetic fields on a macrospin system under explicit consideration of inertial dynamics. This is usually achieved by extending the Landau–Lifshitz–Gilbert equation with a term including the second time derivative of the magnetization. The dynamics of the magnetization switching can then be characterized by its switching rate. We apply methods from transition state theory for driven systems to resolve the rate of magnetization switching in this general case. In doing so, we find that magnetization exhibits resonance-like behavior under certain driving conditions, and it can be affected strongly by the system’s relaxation rate.

了解铁磁薄膜中的磁化转换过程对于许多技术应用至关重要。在明确考虑惯性动力学的情况下，我们研究了通过磁场进行周期性驱动对宏自旋系统的影响。这通常通过使用包括磁化的二阶时间导数的项来扩展 Landau-Lifshitz-Gilbert 方程来实现。磁化切换的动态特性可以通过其切换速率来表征。我们将过渡态理论中的方法应用于驱动系统来解决这种一般情况下的磁化切换速率。在这样做的过程中，我们发现磁化在某些驱动条件下表现出类似共振的行为，并且它会受到系统弛豫率的强烈影响。