Direct observation of massless domain wall dynamics in nanostripes with perpendicular magnetic anisotropy.
Direct observation of massless domain wall dynamics in nanostripes with perpendicular magnetic anisotropy.
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DOI：
10.1103/physrevlett.108.247202
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发表时间：
2012-06
影响因子：
8.6
通讯作者：
J. Vogel;M. Bonfim;N. Rougemaille;O. Boulle;I. Miron;S. Auffret;B. Rodmacq;G. Gaudin;J. Cezar;F. Sirotti;S. Pizzini
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文献类型：
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作者：
J. Vogel;M. Bonfim;N. Rougemaille;O. Boulle;I. Miron;S. Auffret;B. Rodmacq;G. Gaudin;J. Cezar;F. Sirotti;S. Pizzini
在具有垂直磁各向异性的纳米条纹（Pt/Co/AlO(x)）中，由纳秒级电流脉冲引起的畴壁运动显示出可忽略的惯性。时间分辨磁显微镜在电流脉冲期间显示，畴壁开始移动，以恒定的速度，一旦电流达到恒定的幅度，和没有或很少运动发生在脉冲结束后。这些畴壁的“质量”很低是由于它们的窄宽度和高阻尼参数α的共同作用。如此小的惯性应该允许通过调整电流脉冲的持续时间和幅度来精确控制畴壁运动。
Domain wall motion induced by nanosecond current pulses in nanostripes with perpendicular magnetic anisotropy (Pt/Co/AlO(x)) is shown to exhibit negligible inertia. Time-resolved magnetic microscopy during current pulses reveals that the domain walls start moving, with a constant speed, as soon as the current reaches a constant amplitude, and no or little motion takes place after the end of the pulse. The very low "mass" of these domain walls is attributed to the combination of their narrow width and high damping parameter α. Such a small inertia should allow accurate control of domain wall motion by tuning the duration and amplitude of the current pulses.