Temperature-dependent exchange stiffness and domain wall width in Co
Temperature-dependent exchange stiffness and domain wall width in Co
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Co 中与温度相关的交换刚度和畴壁宽度
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
O. Chubykalo
中科院分区：
文献类型：
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作者：
R. Moreno;R. Evans;S. Khmelevskyi;M. Muñoz;R. Chantrell;O. Chubykalo
微磁交换刚度是磁化动力学和反转过程的数值模拟中的关键参数，但目前的文献报道了广泛的值，即使是这样简单和广泛使用的材料，如钴。利用从头算方法计算了六方密堆积和面心立方钴的低温微磁交换刚度。对于hcp Co，它们在平行和垂直于c轴的方向上略有不同。我们建立了交换刚度标度关系与磁化强度A（m）<$m1.8适用于很宽的温度范围。对于hcp Co，我们发现在24-29 nm的范围内随温度增加的各向异性畴壁宽度。结果形成了大规模的温度依赖性微磁学模拟的关键输入，并证明了正确的参数化的重要性，准确的模拟磁化动力学。
The micromagnetic exchange stiffness is a critical parameter in numerical modeling of magnetization dynamics and reversal processes, yet the current literature reports a wide range of values even for such simple and widely used material as cobalt. Using the ab initio estimated Heisenberg parameters we calculate the low temperature micromagnetic exchange stiffness for hexagonal-close-packed (hcp) and face-centered-cubic cobalt. For hcp Co they are slightly different in the directions parallel and perpendicular to the c axis. We establish the exchange stiffness scaling relation with magnetization A(m)∼m1.8 valid for a wide range of temperatures. For hcp Co we find an anisotropic domain wall width in the range 24-29 nm which increases with temperature. The results form a critical input for large-scale temperature-dependent micromagnetics simulations and demonstrate the importance of correct parametrization for accurate simulation of magnetization dynamics.