磁畴壁运动的交叉棘轮效应
Crossed ratchet effects for magnetic domain wall motion
摘要：
我们从实验和理论两方面研究了非对称孔周期阵列图案化外延非晶磁性薄膜中畴壁的驱动运动。我们发现两个交叉棘轮效应相反的符号，改变畴壁传播的首选意义，这取决于是否是一个平面或扭结壁移动。通过数值求解一个简单的$ϕ^4$模型，我们表明，这种效果的基本物理成分是相当通用的，可以实现在其他实验系统中，涉及弹性界面移动多维棘轮电位。
英文摘要：
We study both experimentally and theoretically the driven motion of domain walls in extended amorphous magnetic films patterned with a periodic array of asymmetric holes. We find two crossed ratchet effects of opposite sign that change the preferred sense for domain wall propagation, depending on whether a flat or a kinked wall is moving. By solving numerically a simple $ϕ^4$-model we show that the essential physical ingredients for this effect are quite generic and could be realized in other experimental systems involving elastic interfaces moving in multidimensional ratchet potentials.
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