Thermally activated switching rate of a nanomagnet in the presence of spin torque
Thermally activated switching rate of a nanomagnet in the presence of spin torque
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DOI：
10.1103/physrevb.88.214414
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发表时间：
2013-12-16
影响因子：
3.7
通讯作者：
Imamura, Hiroshi
中科院分区：
文献类型：
--
作者：
Taniguchi, Tomohiro;Utsumi, Yasuhiro;Imamura, Hiroshi
研究了面内磁化系统热激活区自旋力矩开关速率与电流的关系。开关速率的对数非线性地依赖于高电流区域中的电流，I-c小于或类似于I <I-c *，其中I-c和I-c * 是区分磁化稳定性的临界电流。我们还发现，尝试频率在I-c附近有一个最小值，并且在I-c处的尝试频率比零电流处的尝试频率小三个数量级，这与先前实验分析中假设的它保持恒定相反。
The current dependence of the spin torque switching rate in a thermally activated region of an in-plane magnetized system was studied. The logarithm of the switching rate depended nonlinearly on current in the high-current region, I-c less than or similar to I < I-c*, where I-c and I-c* are critical currents distinguishing the stability of the magnetization. We also found that the attempt frequency had a minimum around I-c, and that the attempt frequency at I-c was three orders of magnitude smaller than that at zero current, contrary to the assumption in previous analyses of experiments that it remains constant.