Magnetically induced phase separation in the Co-Cr binary system

G. W. Qin, K. Oikawa, T. Ikeshoji, R. Kainuma, K. Ishida

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15 Citations (Scopus)


Direct evidence of phase separation in the Co-rich corner of the Co-Cr binary system, the transformation of high-temperature FCC α-Co into a ferromagnetic αf phase and a paramagnetic αp phase, has been experimentally obtained by using diffusion couple technique, scanning electron microscopy with energy dispersion analysis of X-ray (SEM-EDX), analytical transmission electron microscopy, optical microscopy and X-ray diffraction. Thermodynamic calculation, on the basis of the presently obtained phase equilibrium data, has verified that this phase separation arises from magnetic ordering, and that a similar phase separation appears in the HCP phase below 469°C which is transformed into a ferromagnetic εf phase and a paramagnetic εp phase. It is therefore concluded that magnetically induced phase separation must be responsible for the microscopic composition modulation of Cr in the CoCr thin film magnetic recording media.

Original languageEnglish
Pages (from-to)1-5
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Issue number1
Publication statusPublished - 2001 Aug


  • Co-Cr system
  • Magnetic recording media
  • Phase separation


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