Nanostructure and magnetic properties of composite CoPt:C films for extremely high-density recording

M. Yu, Y. Liu, D. J. Sellmyer

Research output: Contribution to journalConference articlepeer-review

77 Scopus citations


The nanostructure and magnetic properties of composite CoPt:C films at room temperature were investigated as a function of annealing temperature, carbon concentration, and film thickness. CoPt:C films with a variety of carbon concentrations were fabricated by cosputtering Co, Pt, and C onto water-cooled Si(100) substrates followed by annealing. X-ray diffraction and transmission electron microscopy analyses indicate that nanocrystallites of face-centered-tetragonal (fct) CoPt phase, which has a uniaxial magnetocrystalline anisotropy constant of about 5 × 107 erg/cm3, can be formed in carbon matrix when the annealing temperature is higher than 600°C. The grain sizes of the fct CoPt crystallites are about 10 nm and the coercivities can be as high as 12 kOe. Higher annealing temperature and lower carbon concentration generally lead to larger grain sizes and perhaps more complete formation of the fct CoPt phase, and therefore higher coercivities. The coercivity is insensitive to the film thickness until the thickness is smaller than the CoPt grain size, when the coercivity starts to decrease with film thickness. The magnetic activation volumes are typically around 1 × 10-18 cm3. The nanostructure and the associated magnetic properties of these composite CoPt:C films are promising as potential media for extremely high-density recording.

Original languageEnglish (US)
Pages (from-to)6959-6961
Number of pages3
JournalJournal of Applied Physics
Issue number9 III
StatePublished - May 1 2000
Event44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, United States
Duration: Nov 15 1999Nov 18 1999

ASJC Scopus subject areas

  • General Physics and Astronomy


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