Vortex circulation control in mesoscopic ring magnets
Vortex circulation control in mesoscopic ring magnets
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DOI：
10.1063/1.1361282
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发表时间：
2001-05-21
影响因子：
4
通讯作者：
Cui, Z
中科院分区：
文献类型：
--
作者：
Kläui, M;Rothman, J;Cui, Z
我们提出了一种简单的方法来控制在介观环形磁铁的磁化循环的方向，只使用一个均匀的磁场。该方法是基于成核自由切换时发生的环切换从近饱和状态，被称为“洋葱状态”，磁通闭合的涡旋状态。对于给定的磁场方向，可能有两种洋葱态，正向或反向磁化。从向前或向后的洋葱状态，无论是本地扫描克尔显微镜测量和微磁模拟表明，顺时针或逆时针涡旋状态，分别可以选择由于不对称钉扎的两个域壁是存在于洋葱状态。(C)2001年美国物理学会。
We present a simple method to control the direction of the circulation of the magnetization in mesoscopic ring magnets, using a uniform magnetic field only. The method is based on the nucleation free switching which occurs when the rings switch from the near-saturated state, referred to as the "onion state," to the flux-closed vortex state. Two possible onion states, forward or reverse magnetized, are possible for a given direction of the magnetic field. Going from the forward or the backward onion state, both local scanning Kerr microscopy measurements and micromagnetic simulations show that the clockwise or the counterclockwise vortex state, respectively, can be selected due to asymmetric pinning of the two domain walls that are present in the onion state. (C) 2001 American Institute of Physics.