Large uniaxial magnetic anisotropy of Co-Pt perpendicular films induced by lattice deformation

T. Shimatsu, Y. Okazaki, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A study of the thickness dependence of the uniaxial magnetic anisotropy Ku of Co-Pt perpendicular films deposited on Ru seed layers was extended over a wide range of Pt content from 10 to 30 at%, to further investigate the origin of the significant increase in Ku on reducing the film thickness, which was previously reported for Co80Pt 20/Ru films. Ku increased significantly as the thickness decreased in all series of films with various Pt content. The rate of increase of Ku with reducing thickness became increasingly large as the Pt content decreased. It should be noted that the Ku of 2-nm-thick films was an almost constant 2 × 107 erg/cm3 over the range of Pt contents studied, although Ku was maximized at 25-30at%Pt content for films thicker than 5 nm. Experimental results suggest that the increase in Ku on reducing the thickness was mostly related to a reduction of the hep Co-Pt lattice c/a ratio.

Original languageEnglish
Pages (from-to)2995-2997
Number of pages3
JournalIEEE Transactions on Magnetics
Volume43
Issue number6
DOIs
Publication statusPublished - 2007 Jun 1

Keywords

  • Co-Pt films
  • Fee volume fraction
  • Hep lattice
  • Lattice deformation
  • Ru underlayer
  • Surface anisotropy
  • Uniaxial magnetic anisotropy

ASJC Scopus subject areas

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

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