Lack of dependence between intrinsic magnetic damping and perpendicular magnetic anisotropy in Cu(t(Cu))/[Ni/Co](N) multilayers
Lack of dependence between intrinsic magnetic damping and perpendicular magnetic anisotropy in Cu(t(Cu))/[Ni/Co](N) multilayers
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Cu(t(Cu))/[Ni/Co](N) 多层膜中的固有磁阻尼和垂直磁各向异性之间缺乏依赖性
DOI：
10.1016/j.jmmm.2016.12.098
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发表时间：
2017
影响因子：
2.7
通讯作者：
Q. Y. Jin
中科院分区：
文献类型：
--
作者：
Minghong Tang;Wei Li;Yang Ren;Zongzhi Zhang;Q. Y. Jin
通过时间分辨磁光克尔效应研究了 Cu(tCu)/[Ni/Co]N 多层膜中磁阻尼和垂直磁各向异性之间的相关性。通过调节多层重复数或 Cu 厚度 tCu，单轴磁各向异性常数 Ku 在 3.0–3.6 Merg/cm3 范围内变化。结果发现，PMA强度Ku随着N的增加而增加，而阻尼常数α0几乎保持恒定为0.025，这意味着固有阻尼与N的Ku调无关。相比之下，astCu 从 2.5 nm 增加到 20 nm，尽管 Ku 的增强相当弱且其非单调变化行为，但 α0 值连续上升至 0.040。我们认为常数α0withNis是由于每个Co/Ni界面处的自旋轨道耦合强度不变，而α0withCures的明显增强主要是由于较粗糙的Cu/Ni界面处自旋无序程度的增加。
The correlation between magnetic damping and perpendicular magnetic anisotropy has been investigated in Cu(tCu)/[Ni/Co]Nmultilayers by time-resolved magneto-optical Kerr effect. The uniaxial magnetic anisotropy constantKuis varied in the range of 3.0–3.6 Merg/cm3by tuning either multilayer repetition numberNor Cu thicknesstCu. It is found that the PMA strengthKuincreases with the increase ofN, while the damping constant α0keeps nearly a constant of 0.025, implying the intrinsic damping is independent of theKutuned byN. In contrast, astCuincreases from 2.5 to 20 nm, the α0value rises continuously up to 0.040, in spite of the rather weak enhancement inKuand its non-monotonic variation behavior. We consider the constant α0withNis due to the unchanged spin-orbit coupling strength at each Co/Ni interface, while the obvious enhancement in α0withtCuresults mainly from the increased degree of spin disordering at the rougher Cu/Ni interface.