Higher-order magnetic anisotropy in soft-hard magnetic materials
Higher-order magnetic anisotropy in soft-hard magnetic materials
复制标题
软硬磁材料中的高阶磁各向异性
DOI:
10.1103/physrevb.107.l041410
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发表时间:
2023
影响因子:
3.7
通讯作者:
Binh N
中科院分区:
文献类型:
--
作者:
Binh N
We have computationally studied the properties of higher-order magnetic anisotropy constants in ancore-shell system which is characterized by a strong second-order two-ion Fe-Pt anisotropy component. We show that the core-shell structure induces an unexpected fourth-order anisotropy constant, the magnitude of which varies nonmonotonically with the core-size ratioreaching a peak at. Furthermore, we find thatscales with the normalized magnetization byat 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 demonstratesarises from the canting of the core and shell magnetization, and successfully reproduces and justifies the scaling exponent obtained from numerical simulation.
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