Magnetic damping and perpendicular magnetic anisotropy in Pd- buffered [Co/Ni]5 and [Ni/Co]5 multilayers

被引：26

作者：

Tang, Minghong ^{[1
]}

Li, Wei ^{[2
]}

Ren, Yang ^{[3
]}

Zhang, Zongzhi ^{[1
]}

Lou, Shitao ^{[2
]}

Jin, Q. Y. ^{[1
,2
]}

机构：

[1] Fudan Univ, Dept Opt Sci & Engn, Minist Educ, Key Lab Micro & Nano Photon Struct, Shanghai 200433, Peoples R China

[2] East China Normal Univ, State Key Lab Precis Spect, Shanghai 200062, Peoples R China

[3] Yunnan Univ, Sch Phys & Astron, Kunming 650000, Peoples R China

来源：

RSC ADVANCES | 2017年 / 7卷 / 09期

基金：

中国国家自然科学基金;

关键词：

FILMS; DYNAMICS; REVERSAL; DOMAIN;

D O I：

10.1039/c6ra26087j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

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 alpha(0) increases continuously with increasing the Pd thickness t(Pd), showing no linear correlation with the perpendicular magnetic anisotropy constant K-u 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 K-u but larger alpha(0), 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.

引用

页码：5315 / 5321

页数：7

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