Thermally induced vortex nucleation in permalloy elements
Thermally induced vortex nucleation in permalloy elements
复制标题
坡莫合金元件中的热致涡旋形核
DOI：
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发表时间：
2005
影响因子：
2.1
通讯作者：
J. Fidler
中科院分区：
文献类型：
--
作者：
R. Dittrich;T. Schrefl;M. Kirschner;D. Suess;G. Hrkac;F. Dorfbauer;O. Ertl;J. Fidler
涡旋成核和涡旋运动是微米级磁性元件磁化反转的主要机制。形成涡核所需的临界场取决于温度。提出了一种结合标准Landau-Lifshitz-Gilbert （LLG）微磁学和弹性带法的方法来模拟磁性薄膜元件的非零温度磁滞曲线。LLG模拟给出了涡流进入元件前后的平衡态，而弹性带方法给出了这两个态之间的能垒高度。因此，可以计算温度相关的成核场，而无需执行随机LLG模拟。
Vortex nucleation and vortex motion are the main mechanisms of magnetization reversal in micrometer-sized magnetic elements. The critical field required to nucleate a vortex depends on the temperature. We propose a method that combines standard Landau-Lifshitz-Gilbert (LLG) micromagnetics and an elastic band method to simulate nonzero temperature hysteresis curves of magnetic thin film elements. Whereas the LLG simulations gives the equilibriums states before and after a vortex enters the element, the elastic band method gives the height of the energy barrier between these two states. Thus temperature-dependent nucleation fields can be computed without the need to perform stochastic LLG simulations.