Perpendicular anisotropy and gilbert damping in sputtered Co/Pd multilayers

T. Kato, Y. Matsumoto, S. Kashima, S. Okamoto, N. Kikuchi, S. Iwata, O. Kitakami, S. Tsunashima

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

Gilbert damping constants α of Co/Pd multilayers with various layered structures were estimated by time resolved magneto-optical Kerr effect. The [Co( t-Co/Pd( t-Pd] 6 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 α of 0.09. The same trend was seen for Co/Ni multilayers with a constant t-Co/t Ni, although the values of α are different, i.e., 0.035 for Co/Ni. From the estimation of the damping α of the multilayers with various t-Co/t Pd, the α was confirmed to be enhanced when the ratio t-Co/t Pd becomes lower than 0.8. Moreover, the linear relationship between the α and t-Pd/t Co was found. These results suggest that the damping α of both Co/Pd and Co/Ni multilayers are not closely correlated with their PMA, and mainly determined by the composition of the multilayers.

Original languageEnglish
Article number6332782
Pages (from-to)3288-3291
Number of pages4
JournalIEEE Transactions on Magnetics
Volume48
Issue number11
DOIs
Publication statusPublished - 2012 Oct 29

Keywords

  • Co/Pd multilayer
  • Gilbert damping
  • magnetization dynamics
  • time-resolved magneto-optical Kerr effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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