Study of Vortex Configuration and Switching Behavior in Submicro-Scaled Asymmetric Permalloy Ring
Study of Vortex Configuration and Switching Behavior in Submicro-Scaled Asymmetric Permalloy Ring
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DOI：
10.1109/tmag.2012.2204044
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发表时间：
2012-10
影响因子：
2.1
通讯作者：
Chao-Hsien Huang;Nian Jia Cheng;Feng-Sheng Wu;J. Wu;L. Horng
中科院分区：
文献类型：
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作者：
Chao-Hsien Huang;Nian Jia Cheng;Feng-Sheng Wu;J. Wu;L. Horng
通过改变坡莫合金环的直径和位移长度，研究了坡莫合金环的非对称度对开关行为和涡旋位形的影响。采用面向对象的微磁框架软件对非对称坡莫合金单环的磁位形和反转过程进行了数值模拟。通过引入一个从外圆中心偏移一个偏移长度的内圆，定义了一个非对称环和非对称比。的涡旋成核（Hn）和涡旋湮灭（Han）领域，从300，500，和800 nm的外径的模拟磁滞回线分析，具有线性关系的不对称比。值得注意的是，Hn的线性关系与内径的变化无关，仅取决于不对称比率。这一结果表明，非对称环不仅可以决定涡旋的手征性，还可以决定涡旋的成核场和湮灭场。
The influence of the degree of asymmetry of a Permalloy ring on the switching behavior and vortex configuration was studied by changing the diameter of the circle and its shift length. The object oriented micromagnetic framework software was used to simulate the magnetic configurations and reversal processes in a single asymmetric Permalloy ring. By introducing an inner circle shifted from the center of the outer circle by a shift length, an asymmetric ring and asymmetric ratio are defined. The vortex nucleation (Hn) and vortex annihilation (Han) fields, analyzed from the simulated hysteresis loops with 300, 500, and 800 nm outer diameters, have linear relations to the asymmetric ratio. It is noteworthy that a linear relationship for Hn is independent on the variation of the inner diameters and is only dependent on the asymmetric ratio. This result demonstrates that an asymmetric ring could determine not only the vortex chirality, but also the vortex nucleation and annihilation fields.