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

6 Scopus citations


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
Issue number10
StatePublished - Oct 2006


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


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