Direct calculation of the attempt frequency of magnetic structures using the finite element method
Direct calculation of the attempt frequency of magnetic structures using the finite element method
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DOI：
10.1063/1.4712033
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发表时间：
2012-05-01
影响因子：
3.2
通讯作者：
Suess, D.
中科院分区：
文献类型：
--
作者：
Fiedler, G.;Fidler, J.;Suess, D.
给出了过渡态理论的数值实现，该理论可用于计算任意形状磁性纳米结构的尝试频率f(0)。采用有限元法对微磁方程进行离散化。采用爬升图像轻推弹性带法计算鞍点构型，计算f(0)所需的鞍点构型。对于单畴粒子，实现的数值模型与解析解非常吻合。该方法用于比较先进记录介质的单相和分级介质颗粒的f(0)。如果这两种介质类型的最大各向异性相同，则预测F(0)具有可比性。(C) 2012年美国物理研究所。[http://dx.doi.org/10.1063/1.4712033]
A numerical implementation of the transition state theory is presented which can be used to calculate the attempt frequency f(0) of arbitrary shaped magnetic nanostructures. The micromagnetic equations are discretized using the finite element method. The climbing image nudged elastic band method is used to calculate the saddle point configuration, which is required for the calculation of f(0). Excellent agreement of the implemented numerical model and analytical solutions is obtained for single domain particles. The developed method is applied to compare f(0) for single phase and graded media grains of advanced recording media. f(0) is predicted to be comparable if the maximum anisotropy is the same in these two media types. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4712033]