Transition state theory characterizes thin film macrospin dynamics driven by an oscillatory magnetic field: Inertial effects

Transition state theory characterizes thin film macrospin dynamics driven by an oscillatory magnetic field: Inertial effects
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过渡态理论描述了由振荡磁场驱动的薄膜宏观自旋动力学:惯性效应

DOI:
10.1016/j.cnsns.2022.106764
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发表时间:
2022
影响因子:
3.9
通讯作者:
Hernandez, Rigoberto
Hernandez, Rigoberto
中科院分区:
数学2区
文献类型:
--
作者:
Maihöfer, Michael;Reiff, Johannes;Main, Jörg;Hernandez, Rigoberto

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了解铁磁薄膜中的磁化转变过程对于许多技术应用至关重要。我们在明确考虑惯性动力学的情况下研究了磁场周期性驱动对宏自旋系统的影响。这通常是通过使用包含磁化强度的二阶时间导数的项来扩展 Landau-Lifshitz-Gilbert 方程来实现的。磁化切换的动态特性可以通过其切换速率来表征。我们应用驱动系统过渡态理论的方法来解决这种一般情况下的磁化切换速率。在此过程中,我们发现磁化强度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。
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.
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