Observation of the intrinsic pinning of a magnetic domain wall in a ferromagnetic nanowire
Observation of the intrinsic pinning of a magnetic domain wall in a ferromagnetic nanowire
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DOI：
10.1038/nmat2961
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发表时间：
2011-03-01
期刊：
影响因子：
41.2
通讯作者：
Ono, T.
中科院分区：
文献类型：
--
作者：
Koyama, T.;Chiba, D.;Ono, T.
自旋转移矩对于电磁化翻转是必不可少的（1，2）。当磁畴壁由电流通过绝热自旋力矩驱动时，该理论预测了阈值电流，即使对于没有任何外部钉扎的完美导线也是如此（3）。然而，这种“内在钉扎”的实验证实一直缺失。在这里，我们给出的证据表明，这种内在的钉扎确定的阈值，从而绝热自旋扭矩占主导地位的畴壁运动在垂直磁化的Co/Ni纳米线。内在的性质表现在场无关的阈值电流和存在的最小值上调整线的宽度。所展示的纯粹由于绝热自旋扭矩引起的畴壁运动将用于实现自旋电子器件中的稳健操作和低能耗（5-8）。
The spin transfer torque is essential for electrical magnetization switching(1,2). When a magnetic domain wall is driven by an electric current through an adiabatic spin torque, the theory predicts a threshold current even for a perfect wire without any extrinsic pinning(3). The experimental confirmation of this 'intrinsic pinning', however, has long been missing. Here, we give evidence that this intrinsic pinning determines the threshold, and thus that the adiabatic spin torque dominates the domain wall motion in a perpendicularly magnetized Co/Ni nanowire. The intrinsic nature manifests itself both in the field-independent threshold current and in the presence of its minimum on tuning the wire width. The demonstrated domain wall motion purely due to the adiabatic spin torque will serve to achieve robust operation and low energy consumption in spintronic devices(5-8).