Perpendicular Anisotropy and Gilbert Damping in Sputtered Co/Pd Multilayers

被引：38

作者：

Kato, T. ^{[1
]}

Matsumoto, Y. ^{[1
]}

Kashima, S. ^{[1
]}

Okamoto, S. ^{[2
]}

Kikuchi, N. ^{[2
]}

Iwata, S. ^{[1
]}

Kitakami, O. ^{[2
]}

Tsunashima, S. ^{[3
]}

机构：

[1] Nagoya Univ, Dept Quantum Engn, Nagoya, Aichi 4648603, Japan

[2] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan

[3] Nagoya Ind Sci Res Inst, Dept Res, Nagoya, Aichi 4640819, Japan

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2012年 / 48卷 / 11期

关键词：

Co/Pd multilayer; Gilbert damping; magnetization dynamics; time-resolved magneto-optical Kerr effect; FILM LAYERED STRUCTURES; MAGNETIC-ANISOTROPY; FERROMAGNETIC-RESONANCE; CO/NI MULTILAYERS; ALLOY-FILMS; CONSTANT; DYNAMICS; MEDIA; PD/CO; PD;

D O I：

10.1109/TMAG.2012.2198446

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Gilbert damping constants of Co/Pd multilayers with various layered structures were estimated by time resolved magneto-optical Kerr effect. The [Co(t(Co))/Pd(t(Pd))](8) multilayers exhibiting a perpendicular magnetic anisotropy (PMA) were prepared by dc magnetron sputtering on a Pd (1 nm)/Ta (30 nm)/oxidized Si substrate. The PMA of the multilayer having t(Co)/t(Pd) = 0.55 increased with decreasing the bilayer period, t(Co) + t(Pd), while all the multilayers showed almost the same of 0.09. The same trend was seen for Co/Ni multilayers with a constant, although the values of alpha are different, i. e., 0.035 for Co/Ni [9]. From the estimation of the damping of the multilayers with various t(Co)/t(Pd), the alpha was confirmed to be enhanced when the ratio becomes lower than 0.8. Moreover, the linear relationship between the alpha and t(Co)/t(Pd) was found. These results suggest that the damping of both Co/Pd and Co/Ni multilayers are not closely correlated with their PMA, and mainly determined by the composition of the multilayers.

引用

页码：3288 / 3291

页数：4