Disorder-independent control of magnetic monopole defect population in artificial spin-ice honeycombs
Disorder-independent control of magnetic monopole defect population in artificial spin-ice honeycombs
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DOI：
10.1088/1367-2630/14/4/045010
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发表时间：
2012-04-26
影响因子：
3.3
通讯作者：
Cohen, L. F.
中科院分区：
文献类型：
--
作者：
Ladak, S.;Walton, S. K.;Cohen, L. F.
人工自旋冰纳米结构中冰规则的破坏导致磁矩为零的磁性缺陷。这种缺陷存在于某些纳米结构的磁开关过程中，但在具有相同几何形状并由相同材料组分制成的其他明显相似的阵列中却不存在。对这种差异提出的一种解释是，这是由于样品之间的无序变化，只有在高度无序的样品中才会形成缺陷。虽然无序确实可以发挥作用，在确定的磁致密度，在本文中，我们表明，通过实验和模拟，在类似的样品，低的障碍，控制磁开关的性质的因素是域壁是否在横向壁制度或在涡壁制度。这项工作表明，可以控制的内在微磁行为，以及由外部淬火无序的形成。
Breakdown of the ice rule in artificial spin-ice nanostructures results in magnetic monopole defects with zero magnetic moment. Such defects exist during the magnetic switching process in some nanostructures and yet are absent in other apparently similar arrays having the same geometry and made from the same material components. One explanation proposed for this discrepancy is that it is due to the variation of disorder across samples, with monopole defect formation occuring only in highly disordered samples. Although disorder can indeed play a role in the determination of monopole density, in this paper we show, by experiment and simulation, that in samples of similar, low disorder, the factor controlling the nature of magnetic switching is whether the domain walls are in the transverse wall regime or in the vortex wall regime. This work illustrates that monopole formation can be controlled by intrinsic micromagnetic behaviour as well as by extrinsic quenched disorder.