Critical thickness for spin wave-assisted switching of magnetization in a perpendicularly magnetized nanomagnet
Critical thickness for spin wave-assisted switching of magnetization in a perpendicularly magnetized nanomagnet
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DOI：
10.1063/1.5029219
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发表时间：
2018-05
影响因子：
4
通讯作者：
T. Yamaji;H. Imamura
中科院分区：
文献类型：
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作者：
T. Yamaji;H. Imamura
在一个垂直磁化的纳米磁体通过施加一个圆极化的射频场的磁化切换分析作为一个功能的样品的厚度（d）使用一个有效的一维模型。发现存在两种临界厚度dc 1和dc 2（≥ dc 1）。当d <dc_1时，开关模式为均匀型，可用宏观自旋模型描述。另一方面，当dc 1 ≤ d <dc 2时，开关模式是非均匀型的，而开关场的射频频率依赖性与d <dc 1时相同。在d ≥ dc ~ 2的情况下，开关场取最小值的临界射频频率增大。结果表明，与传统的微波辅助开关相比，微波辅助开关能更有效地减小开关场。
The magnetization switching in a perpendicularly magnetized nanomagnet by applying a circularly polarized rf field is analyzed as a function of the thickness (d) of the specimen using an effective one-dimensional model. It is found that there exist two kinds of critical thicknesses, dc1 and dc2 (≥dc1). When d < dc1, the switching mode is uniform type which is well described by a macro-spin model. On the other hand, when dc1 ≤ d < dc2, the switching mode is non-uniform type, whereas the rf frequency dependence of the switching field is the same as the one with d < dc1. In the case of d ≥ dc2, the critical rf frequency at which the switching field takes a minimum value, increases. The results indicate that the switching field is more effectively reduced than the conventional microwave-assisted switching.