Effect of spacer layer on the magnetization dynamics of permalloy/rare-earth/permalloy trilayers
Effect of spacer layer on the magnetization dynamics of permalloy/rare-earth/permalloy trilayers
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DOI：
10.1063/1.4915102
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发表时间：
2015-03
影响因子：
3.2
通讯作者：
C. Luo;Yuli Yin;Dong Zhang;Sheng Jiang;J. Yue;Y. Zhai;J. Du;H. Zhai
中科院分区：
文献类型：
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作者：
C. Luo;Yuli Yin;Dong Zhang;Sheng Jiang;J. Yue;Y. Zhai;J. Du;H. Zhai
利用铁磁共振(FMR)测量的频率依赖关系，研究了不同类型(Gd和Nd)和隔层厚度的坡莫合金/稀土/坡莫合金三层膜在不同稀土隔层中的行为。通过对铁磁共振共振场和线宽的频率依赖关系的拟合，我们发现，所有样品的面内单轴各向异性都保持不变，垂直各向异性对于不同厚度的Gd层几乎没有变化，但值随Nd层厚度的不同而变化。不同厚度的Gd对材料的吉尔伯特损耗影响不大，但6 nm的Gd使材料的吉尔伯特损耗从8.4×10−3增加到2 0.1×10−3，当Gd的厚度大于6 nm时，吉尔伯特损耗趋于平缓。
The permalloy/rare-earth/permalloy trilayers with different types (Gd and Nd) and thicknesses of spacer layer are investigated using frequency dependence of ferromagnetic resonance (FMR) measurements at room temperature, which shows different behaviors with different rare earth spacer layers. By fitting the frequency dependence of the FMR resonance field and linewidth, we find that the in-plane uniaxial anisotropy retains its value for all samples, the perpendicular anisotropy remains almost unchanged for different thickness of Gd layer but the values are tailored by different thicknesses of Nd layer. The Gilbert damping is almost unchanged with different thicknesses of Gd; however, the Gilbert damping is significantly enhanced from 8.4×10−3 to 20.1×10−3 with 6 nm of Nd and then flatten out when the Nd thickness rises above 6 nm.