High Anisotropy CoPtCrB Magnetic Recording Media

摘要

The development of thermally stable, thin, small grain recording media is pivotal for magnetic recording beyond 200 Gbits. This requires media with high magnetic anisotropy and coercivity. There are several alternative materials under investigation that provide adequately high anisotropy, including chemically ordered alloys such as FePt and CoPt and rare-earth transition-metal alloys. Another route to achieve this goal is to increase the magnetocrystalline anisotropy of current state-of-the-art CoPtCrB alloys. The anisotropy is enhanced by Pt substitution of the Co atoms in the hexagonal-close packed (hcp) structure. This approach has the advantage that it is a relatively small change in the disk manufacturing process.