Accession Number:

ADP011813

Title:

CoPt and FePt Thin Films for High Density Recording Media

Descriptive Note:

Conference proceedings

Corporate Author:

DELAWARE UNIV NEWARK DEPT OF PHYSICS AND ASTRONOMY

Report Date:

2000-01-01

Pagination or Media Count:

6.0

Abstract:

Granular CoPtC and FePtC films, consisting of nanoparticles of the highly anisotropic fct CoPt FePt phase embedded in a carbon matrix, were made by co-sputtering from pure Co50Pt50 Fe50Pt50 and C targets using a tandem deposition mode. The as-made films showed a disordered face centered cubic fcc structure, which was magnetically soft and had low coercivity. Magnetic hardening occurred after heat treatment at elevated temperatures, which led to increase in coercivity with values up to 15 kOe. The hardening originated from the transformation of the fcc phase to a highly anisotropic face centered tetragonal phase fct with anisotropy K 10exp 7 ergcu cm. Transmission electron microscopy studies showed FePt particles embedded in C matrix with a particle size increasing from below 5 nm in the as-made state to 15 nm in the fully annealed state. These results are very promising and make these materials potential candidates for high-density magnetic recording.

Subject Categories:

  • Recording and Playback Devices
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE