The creation of 360° domain walls in ferromagnetic nanorings by circular applied magnetic fields
The creation of 360° domain walls in ferromagnetic nanorings by circular applied magnetic fields
复制标题
DOI：
10.1063/1.4864441
复制
发表时间：
2014-05-07
影响因子：
3.2
通讯作者：
Aidala, Katherine E.
中科院分区：
文献类型：
--
作者：
Bickel, Jessica E.;Smith, Spencer A.;Aidala, Katherine E.
铁磁纳米结构中的开关行为通常是由畴壁的形成和湮灭决定的。与大多数纳米结构中更常见的180度DWs相比，360度DWs是纳米结构的过渡状态。本文研究了利用微磁模拟的圆形磁场产生的360度DWs的形成。360度DWs由一对相反排列的倾斜矩形成，每个倾斜矩都成长为由两个180度DWs包围的旋转域，180度DWs结合形成360度DWs。由于这些域的倾斜方向相反，所得到的360度DWs以相反的拓扑圈数成对出现。形成的DWs的最终数量很大程度上受到环形和圆形磁场位置的对称性的影响。(C) 2014 AIP出版有限责任公司
Switching behavior in ferromagnetic nanostructures is often determined by the formation and annihilation of domain walls (DWs). In contrast to the more familiar 180 degrees DWs found in most nanostructures, 360 degrees DWs are the proposed transition state of nanorings. This paper examines the formation of 360 degrees DWs created by the application of a circular magnetic field using micromagnetic simulations. 360 degrees DWs form from pairs of canting moments that are oppositely aligned, which each grow to form rotated domains bounded by two 180 degrees DWs and the 180 degrees DWs combine to form 360 degrees DWs. The resulting 360 degrees DWs occur in pairs of opposite topological winding number due to these domains of opposite canting direction. The final number of DWs formed is greatly impacted by symmetry, both of the ring and of the placement of the circular magnetic field. (C) 2014 AIP Publishing LLC.