Role of pinning in current driven domain wall motion in wires with perpendicular anisotropy
Role of pinning in current driven domain wall motion in wires with perpendicular anisotropy
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DOI：
10.1063/1.2998393
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发表时间：
2008-10-27
影响因子：
4
通讯作者：
Terris, B. D.
中科院分区：
文献类型：
--
作者：
Burrowes, C.;Ravelosona, D.;Terris, B. D.
空间和时间分辨的巨磁电阻测量用于检测热激活畴壁（DW）沿由具有垂直磁各向异性的自旋阀形成的线的沿着传播。我们表明，场和电流诱导的DW传播都强烈影响钉扎缺陷的存在。结果表明，DWs在宏观尺度上的蠕变运动是随机的。只有高极化电流密度和/或磁场的组合才允许DW自由传播。这些结果可能有助于解释低电流驱动的DW速度在以前的实验中观察到的。(c)2008年美国物理学会。[DOI：10.1063/1.2998393]
Spatial and time resolved giant magnetoresistance measurements are used to detect thermally activated domain wall (DW) propagation along wires formed from spin valves having perpendicular magnetic anisotropy. We show that field- and current-induced DW propagation are both strongly influenced by the presence of pinning defects. As a result, the creep motion of DWs over macroscopic length scales is found to be stochastic. Only the combination of a high polarized current density and/or magnetic field allows DWs to propagate freely. These results may help explain low current-driven DW velocities observed in previous experiments. (c) 2008 American Institute of Physics. [DOI: 10.1063/1.2998393]