Magnetic domain walls displacement: Automotion versus spin-transfer torque
Magnetic domain walls displacement: Automotion versus spin-transfer torque
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DOI：
10.1103/physrevb.82.214414
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发表时间：
2010-12-10
影响因子：
3.7
通讯作者：
Miltat, Jacques
中科院分区：
文献类型：
--
作者：
Chauleau, Jean-Yves;Weil, Raphael;Miltat, Jacques
根据磁化动力学方程，预测改变结构的畴壁自身会发生位移，这种现象称为自动运动。我们的实验证明了这种效果在软纳米带，通过下自旋转移扭矩的亚稳态不对称的横向壁转化为涡流壁。对于1 ns脉冲，测量的位移比仅在自旋转移扭矩下大三倍以上。分析和数值微磁学解释的结果。强调了它们与自旋转移力矩下畴壁运动的相关性。
From the magnetization dynamics equation, a domain wall that changes structure is predicted to undergo a displacement by itself, a phenomenon called automotion. We experimentally demonstrate this effect in soft nanostrips, by transforming under spin-transfer torque a metastable asymmetric transverse wall into a vortex wall. Displacements more than three times larger than under spin-transfer torque only are measured for 1 ns pulses. The results are explained by analytical and numerical micromagnetics. Their relevance to domain-wall motion under spin-transfer torque is emphasized.