Oxygen-stoichiometry-dependent microstructural and magnetic properties of CoPt thin films capped with ion-beam-assisted deposited TiOxlayers

Guijun Li, Chi Wah Leung, Chin Shueh, Yi Jing Wu, Ko Wei Lin, An Cheng Sun, Jen Hwa Hsu, Pui To Lai, Philip W.T. Pong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


The magnetic properties of CoPt with different percentages of oxygen in the TiOxcapping layer were investigated through annealing processes. Results have shown that after annealing, the structural phase transformation from fcc to fct CoPt occurred and was confirmed by the enhanced coercivities. In addition, the isolated CoPt grains separated by grain boundary TiOxin the annealed CoPt/TiOx(30% O2/Ar) thin films exhibited the largest coercivity. The excess amount of oxygen in the TiOxlayer may react with Co and Pt to form oxides (as characterized by XPS) and result in the drop of coercivity. Thus the growth of the fct CoPt phase can be enhanced by optimizing the oxygen ratio during fabrication of the TiOxlayer and post annealing, which may find useful applications for future CoPt-based magnetic recording.
Original languageEnglish
JournalSurface and Coatings Technology
Issue numberSUPPL.1
Publication statusPublished - 15 Aug 2013


  • CoPt
  • Ion-beam assisted deposition
  • Magnetic thin films

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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