Spin-orbit torque-driven magnetization switching and thermal effects studied in Ta\CoFeB\MgO nanowires
Spin-orbit torque-driven magnetization switching and thermal effects studied in Ta\CoFeB\MgO nanowires
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DOI：
10.1063/1.4896225
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发表时间：
2014-09-22
影响因子：
4
通讯作者：
Klaeui, M.
中科院分区：
文献类型：
--
作者：
Lo Conte, R.;Hrabec, A.;Klaeui, M.
我们演示了沿纳米线注入电流脉冲，在有或没有与电流方向共线的恒定均匀磁场的情况下，在面外磁化的Ta\CoFeB\MgO纳米线中的磁化开关。我们推导出多层结构中自旋轨道效应产生的有效转矩驱动开关机制。虽然沿电流方向产生的磁化分量对开关的发生至关重要，但我们观察到，即使没有纵向场，热产生的磁化波动也会导致开关。利用广义Neel-Brown模型进行分析，可以估计热诱导自旋-轨道转矩驱动开关过程的关键参数，如尝试频率和有效能垒。(C) 2014 AIP出版有限责任公司
We demonstrate magnetization switching in out-of-plane magnetized Ta\CoFeB\MgO nanowires by current pulse injection along the nanowires, both with and without a constant and uniform magnetic field collinear to the current direction. We deduce that an effective torque arising from spin-orbit effects in the multilayer drives the switching mechanism. While the generation of a component of the magnetization along the current direction is crucial for the switching to occur, we observe that even without a longitudinal field thermally generated magnetization fluctuations can lead to switching. Analysis using a generalized Neel-Brown model enables key parameters of the thermally induced spin-orbit torques-driven switching process to be estimated, such as the attempt frequency and the effective energy barrier. (C) 2014 AIP Publishing LLC.