Micromagnetic simulation of Sm-Co/alpha-Fe/Sm-Co trilayers with various angles between easy axes and the film plane
Micromagnetic simulation of Sm-Co/alpha-Fe/Sm-Co trilayers with various angles between easy axes and the film plane
复制标题
易轴与薄膜平面之间具有不同角度的 Sm-Co/α-Fe/Sm-Co 三层的微磁模拟
DOI：
10.1088/1674-1056/23/9/097504
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发表时间：
2014
影响因子：
1.7
通讯作者：
Xie Lin-Hua
中科院分区：
文献类型：
--
作者：
Zhang Xi-Chao;Zhao Guo-Ping;Xia Jing;Yue Ming;Yuan Xin-Hong;Xie Lin-Hua
用三维软件OOMMF系统地计算了Sm-Co/α-Fe/Sm-Co三层膜的磁滞回线和能量积，其中β是易磁化轴与垂直于膜面的场之间的夹角.结果表明，垂直各向异性的三层膜比面内各向异性的三层膜具有更大的磁电阻率和更小的剩磁和能积。β的增加导致最大能积的快速下降以及剩磁和矫顽力的下降。这种下降比单相硬材料中的下降快得多，这可以解释实验与理论能量积之间的显著差异。一些建模技术已被用于与自旋检查程序进行，这产生的结果与一维（1D）的分析和实验数据，证明我们的计算结果符合良好。此外，根据3D计算计算的成核场大于基于1D模型的成核场，而相应的结晶度较小，导致更多的平方滞后回线和实验数据与理论之间的更好的协议。
Hysteresis loops and energy products have been calculated systematically by a three-dimensional (3D) software OOMMF for Sm—Co/α-Fe/Sm—Co trilayers with various thicknesses and β, where β is the angle between the easy axis and the field applied perpendicular to the film plane. It is found that trilayers with a perpendicular anisotropy possess considerably larger coercivities and smaller remanences and energy products compared with those with an in-plane anisotropy. Increase of β leads to a fast decrease of the maximum energy product as well as the drop of both remanence and coercivity. Such a drop is much faster than that in the single-phased hard material, which can explain the significant discrepancy between the experiment and the theoretical energy products. Some modeling techniques have been utilized with spin check procedures performed, which yield results in good agreement with the one-dimensional (1D) analytical and experimental data, justifying our calculations. Further, the calculated nucleation fields according to the 3D calculations are larger than those based on the 1D model, whereas the corresponding coercivity is smaller, leading to more square hysteresis loops and better agreement between experimental data and the theory.