论文标题
软磁性材料中的高阶磁各向异性
Higher-order magnetic anisotropy in soft-hard magnetic materials
论文作者
论文摘要
我们已经计算研究了L10/A1-pept Coreshell系统中高阶磁各向异性常数的性质，该系统的特征是强二阶2-Ion Fe-Pt Pt-PT各向异性成分。我们表明，Coreshell结构诱导出乎意料的四阶各向异性常数K2，其大小是非单调的，而核心大小的比率r在r = 0.50时达到峰值。 Furthermore, we find that K2 scales with the normalized magnetization by (M/Ms)^2.2 at temperatures below the Curie temperature - a remarkable deviation from the established Callen-Callen theory which instead predicts a scaling exponent of 10. We construct an analytic model which demonstrates K2 arises from the canting of the core and shell magnetization, and successfully reproduces and justifies the scaling exponent obtained from numerical simulation.
We have computationally studied the properties of higher-order magnetic anisotropy constants in an L10/A1-FePt coreshell system which is characterized by a strong second-order 2-ion Fe-Pt anisotropy component. We show that the coreshell structure induces an unexpected fourth-order anisotropy constant K2 the magnitude of which varies non-monotonically with the core-size ratio R reaching a peak at R = 0.50. Furthermore, we find that K2 scales with the normalized magnetization by (M/Ms)^2.2 at temperatures below the Curie temperature - a remarkable deviation from the established Callen-Callen theory which instead predicts a scaling exponent of 10. We construct an analytic model which demonstrates K2 arises from the canting of the core and shell magnetization, and successfully reproduces and justifies the scaling exponent obtained from numerical simulation.
