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首页> 外文期刊>RSC Advances >Magnetic damping and perpendicular magnetic anisotropy in Pd-buffered [Co/Ni]5 and [Ni/Co]5 multilayers
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Magnetic damping and perpendicular magnetic anisotropy in Pd-buffered [Co/Ni]5 and [Ni/Co]5 multilayers

机译：Pd缓冲的[Co / Ni] 5 和[Ni / Co] 5 多层膜的磁阻尼和垂直磁各向异性

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摘要

We systematically studied the influence of Pd underlayer on the magnetic properties of perpendicular [Co/Ni]5 and [Ni/Co]5 multilayers by time-resolved magneto-optical Kerr effect. We found that the saturated magnetic damping constant α0 increases continuously with increasing the Pd thickness tPd, showing no linear correlation with the perpendicular magnetic anisotropy constant Ku for both series of samples. As compared to the Co/Ni sample with the same tPd, the Ni/Co film shows lower saturation magnetization, weaker Ku but larger α0, which can be ascribed to the presence of more paramagnetic spins at the Pd/Ni interface due to the weak exchange coupling stiffness between Ni atoms. By analyzing extrinsic damping contributions from magnetic inhomogeneities, two-magnon scattering and spin pumping effects, the intrinsic damping of perpendicular [Ni/Co]5 is quantitatively determined to be 0.023. This study should provide deep understanding and effective control of magnetic damping for designing high performance magnetic memory devices.
机译：我们系统地研究了Pd底层对垂直[Co / Ni] 5 和[Ni / Co] 5 多层通过时间分辨磁光克尔效应。我们发现饱和磁阻尼常数α 0 随着Pd厚度 t < sub> Pd ，两个系列的样本都与垂直磁各向异性常数 K u 没有线性关系。与具有相同 t Pd 的Co / Ni样品相比，Ni / Co膜的饱和磁化强度较低， K较弱 u 但较大的α 0 ，可以归因于由于Ni原子之间较弱的交换耦合刚度，在Pd / Ni界面处存在更多的顺磁性自旋。通过分析磁不均匀性，两磁子散射和自旋泵浦效应的外在阻尼贡献，定量确定垂直[Ni / Co] 5 的固有阻尼为0.023。这项研究应该为设计高性能磁存储器件提供对磁阻尼的深刻理解和有效控制。

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