Microstructure and magnetic properties of granular CoPtCr-SiO2 films on Ru seed layer

Chun Tao Xiao, Yuki Inaba, Takehito Shimatsu, Hiroaki Muraoka

Research output: Contribution to journalArticlepeer-review


Granular-type [(Co90Cr10)85Pt 15]89.8-[SiO2]10.2 films were prepared by using co-sputtering methods, with Ru as a seed layer. Influences of Ru thickness on the microstructure and magnetic properties of the CoPtCr-SiO2 magnetic layer were investigated. It was found that the seed layer obviously effected the grain isolation, c-axis distribution and magnetic parameters. The Ru seed layer with a suitable thickness is very helpful for achievement of high anisotropy, proper coercivity and high squareness. The anisotropy energy of the magnetic layer can be as high as 5 × 10 6 erg/cm3 or more, even with a thin Ru layer, promising good thermal stability. It was noted that the Ru layer markedly enhanced the isolation of CoPtCr grains, corresponding to the increase of coercivity and the decrease of loop slope. Moreover, it was also revealed that the addition of SiO2 to CoPtCr effectively isolated the CoPtCr grains without disturbing the epitaxial growth of CoPtCr grains on the Ru seed layer.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalModern Physics Letters B
Issue number6
Publication statusPublished - 2007 Mar 10


  • Magnetic properties
  • Microstructure
  • Perpendicular media
  • Seed layer thickness

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Condensed Matter Physics


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