Thermodynamic calculations of phase equilibria of Co-Cr-Pt ternary system and magnetically induced phase separation in the FCC and HCP phases

K. Oikawa, G. W. Qin, T. Ikeshoji, O. Kitakami, Y. Shimada, K. Ishida, K. Fukamichi

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The calculations of phase equilibria of the Co-Cr-Pt ternary system have been carried out based on the thermodynamic assessments of Co-Cr, Co-Pt and Cr-Pt binary systems by the calculation of phase diagram technique. The Gibbs energies of the liquid, FCC, BCC and HCP solution phases were approximated by a sub-regular solution model, while those of σ and Cr3Pt phases were approximated by a compound energy model. Almost all the experimental information on each sub-system has been well described by the present set of thermodynamic parameters. A critical calculation of the magnetically induced miscibility gap between the ferromagnetic HCP and the paramagnetic HCP phase has been conducted, where the two-phase separation has been found at the Curie temperature. The Cr content in the ferromagnetic HCP phase increases and the width of the two-phase separation becomes narrower with increasing Pt content. The present calculations would be useful for the design and development of the perpendicular magnetic recording media.

Original languageEnglish
Pages (from-to)220-233
Number of pages14
JournalJournal of Magnetism and Magnetic Materials
Volume236
Issue number1-2
DOIs
Publication statusPublished - 2001 Oct 1

Keywords

  • Magnetic recording
  • Magnetic transition
  • Phase diagram
  • Phase separation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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