Ultrafast spin-transfer switching in spin valve nanopillars with perpendicular anisotropy
Ultrafast spin-transfer switching in spin valve nanopillars with perpendicular anisotropy
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DOI：
10.1063/1.3284515
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发表时间：
2010-01-11
影响因子：
4
通讯作者：
Mangin, S.
中科院分区：
文献类型：
--
作者：
Bedau, D.;Liu, H.;Mangin, S.
在具有垂直磁化自由层和参考层的自旋阀纳米柱中，研究了短电流脉冲自旋转移开关。演示了电流脉冲短至300 ps的磁化开关。反转磁化所需的脉冲振幅与脉冲持续时间成反比，与宏观自旋自旋转移模型一致。然而，脉冲振幅持续时间开关边界对外加场的依赖比零温度宏自旋模型预测的要大得多。结果还表明，存在一个最佳的脉冲长度，使反转磁化所需的能量最小化。
Spin-transfer switching with short current pulses has been studied in spin-valve nanopillars with perpendicularly magnetized free and reference layers. Magnetization switching with current pulses as short as 300 ps is demonstrated. The pulse amplitude needed to reverse the magnetization is shown to be inversely proportional to the pulse duration, consistent with a macrospin spin-transfer model. However, the pulse amplitude duration switching boundary depends on the applied field much more strongly than predicted by the zero temperature macrospin model. The results also demonstrate that there is an optimal pulse length that minimizes the energy required to reverse the magnetization.