Microwave assistance effect on magnetization switching in Co-Cr-Pt granular film
Microwave assistance effect on magnetization switching in Co-Cr-Pt granular film
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DOI：
10.1063/1.4830364
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发表时间：
2013-11
影响因子：
4
通讯作者：
S. Okamoto;N. Kikuchi;A. Hotta;M. Furuta;O. Kitakami;T. Shimatsu
中科院分区：
文献类型：
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作者：
S. Okamoto;N. Kikuchi;A. Hotta;M. Furuta;O. Kitakami;T. Shimatsu
实验验证了垂直磁性CoCrPT基颗粒膜的微波辅助效应。在射频(RF)场的辅助下，可以明显地观察到矫顽力的显著降低。但矫顽力强烈地依赖于射频磁场的持续时间，这表明组成颗粒的磁矩受到热扰动的严重干扰。基于Neel-Arrhenius定律的分析表明，只有施加幅度小于各向异性场2%的小磁场，才能使纳秒区的动态矫顽力降低50%。
Experimental verification of microwave assistance effect on a perpendicular magnetic CoCrPt based granular film is demonstrated. Significant reduction of coercivity under the assistance of a radio frequency (rf) field is clearly observed. But the coercivity strongly depends on the duration of rf field, indicating that the magnetic moments of constituent grains are severely perturbed by thermal agitation. Analysis based on the Neel-Arrhenius law has revealed that the dynamic coercivity in nanosecond region can be reduced by 50% only by applying a small rf field with the amplitude less than 2% of the anisotropy field.