Enhancement in Magnetic Anisotropy for hcp-Structured Co Alloy Thin Films Through Pt Addition

W. K. Shen, Jack H. Judy, Jian Ping Wang, Anirban Das, Michael Racine, Randy Cheng

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The addition effects of Pt in the (0002) Ru underlayer were studied. It was found that the lattice parameter can be tuned as desired through Pt addition in a (0002)-oriented Ru layer. The out-of-plane and in-plane lattice parameter of the RuPt can be increased by 2.3% and 0.44%, respectively. No phase segregation was apparently observed in RuPt films under these process conditions even with a very high Pt content (39%). The RuPt layer thus provides a good template layer to study the Pt addition effects in (0002)-textured hcp Co alloy perpendicular media with a very wide range of Pt content. CoCrPt-SiO2 films were deposited with a Pt addition level varying from 15% to 40% on an optimally designed RuPt underlayer. The magnetic results showed that Hk, Hc, Ku reached a plateau at about 19%-23% Pt content. The maximum values for Hk, Hc, and Ku are 16.0 kOe, 6.6 kOe, and 3.1 x 106 erg/cm3, respectively.

Original languageEnglish (US)
Pages (from-to)2945-2947
Number of pages3
JournalIEEE Transactions on Magnetics
Volume42
Issue number10
DOIs
StatePublished - Oct 2006

Keywords

  • Co alloy
  • CoCrPt-SiO2 perpendicular media
  • Pt addition
  • Ru underlayer
  • RuPt underlayer
  • X-ray diffraction

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