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首页> 外文期刊>Nanotechnology >Switching modes in easy and hard axis magnetic reversal in a self-assembled antidot array
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Switching modes in easy and hard axis magnetic reversal in a self-assembled antidot array

机译：自组装antidot阵列中的易磁轴和硬轴磁反转的切换模式

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摘要

We study the reversal mechanisms in a self-assembled, hexagonally ordered Fe antidot array with a period of 200 nm and an antidot diameter of 100 nm which was prepared by polystyrene nanosphere lithography. Direction-dependent information in such a self-assembled sample is obtained by measuring the anisotropic magnetoresistance (AMR) through constrictions processed by focused ion beam milling in nearest neighbor and next nearest neighbor directions. We show that such an originally integral method can be used to investigate the strong in-plane anisotropy introduced by the antidot lattice. The easy and hard axis reversal mechanisms and corresponding AMR signals are modeled by micromagnetic simulations. Additional in-field magnetic force microscopy studies allow the correlation of microscopic switching to features in the integral AMR. We find that the easy axis of magnetization is connected to a distinct periodic magnetic domain pattern, which can be observed during the whole magnetization reversal. While this process is driven by nucleation and propagation of reversed domains, the hard axis reversal is characterized by a (stepwise) rotation of the magnetization via the antidot lattice' easy axes.
机译：我们研究了通过聚苯乙烯纳米球光刻技术制备的自组装，六边形有序的铁解毒剂阵列（周期为200 nm，解毒剂直径为100 nm）中的逆转机理。这种自组装样品中与方向相关的信息是通过测量各向异性磁阻（AMR）来获得的，该各向异性磁阻是通过聚焦离子束铣削在最近的相邻方向和下一个最近的相邻方向上处理的收缩而获得的。我们表明，这种原始的积分方法可用于研究由点阵点阵引入的强平面内各向异性。通过微磁仿真对易轴和硬轴反转机制以及相应的AMR信号进行建模。附加的磁场磁力显微镜研究可以使微观切换与整体AMR中的特征相关联。我们发现，易磁化轴与独特的周期性磁畴模式相关，可以在整个磁化反转过程中观察到。尽管此过程是由反向磁畴的形核和传播驱动的，但硬轴反向的特征是通过对映点阵的易轴磁化的（逐步）旋转。

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