Flux-closure chirality control and domain wall trapping in asymmetric magnetic ring
Flux-closure chirality control and domain wall trapping in asymmetric magnetic ring
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DOI：
10.1063/1.3197413
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发表时间：
2009-08
影响因子：
3.2
通讯作者：
X. Wang;W. K. Peng;W. Lew
中科院分区：
文献类型：
--
作者：
X. Wang;W. K. Peng;W. Lew
提出了一种不对称磁环中最窄位置的磁闭手性控制和畴壁捕获技术。对坡莫合金不对称磁环进行了微磁模拟，观察了其磁开关行为。通过控制横向几何特征、环的不对称性和膜的厚度，可以实现局部无涡的反转过程和良好控制的通量闭合手性。此外，在不对称环的窄臂处还观察到畴壁捕获特征，这对应于在较大的磁场中，直到宽臂的磁化反转，磁畴壁才会湮灭的现象。非对称环开关行为的相图表明，非对称环的开关机制（如畴壁传播或成核湮灭）和畴壁钉钉主要取决于薄膜厚度。
A technique for flux-closure chirality control and domain wall trapping at the narrowest position in asymmetric magnetic ring is proposed. Micromagnetic simulation work was performed on permalloy asymmetric magnetic rings to observe its magnetic switching behavior. By controlling the lateral geometric features, the ring asymmetry, and the thickness of the film, a local vortex-free reversal process and well-controlled chirality of flux closure can be achieved. Furthermore, a domain wall trapping feature is also observed at the narrow arm of the asymmetric ring, which corresponds to the phenomenon that the magnetic domain wall does not annihilate until the magnetization in the wide arm reversed in a relatively large magnetic field. A phase diagram of the asymmetric ring switching behavior shows that the switching regimes (e.g., the domain wall propagation or nucleation annihilation) of the asymmetric rings and the domain wall pinning depend mainly on the film thickness.