Higher-order magnetic anisotropy in soft-hard magnetic materials

Higher-order magnetic anisotropy in soft-hard magnetic materials
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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
期刊:
影响因子:
3.7
通讯作者:
Binh N
Binh N
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Binh N

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计算研究了具有强二阶双离子Fe-Pt各向异性分量的核壳体系中高阶磁各向异性常数的性质。我们发现,核壳结构诱导一个意想不到的四阶各向异性常数,其大小随核尺寸比的非单调变化,在。此外,我们发现在居里温度以下的温度下,尺度与归一化磁化强度的显着偏差,而不是预测的标度指数为10,从建立的Callen-Callen理论。我们构建了一个解析模型,从核和壳磁化的倾斜demonstratesarises,并成功地再现和证明从数值模拟得到的标度指数。
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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