R&D: Effect of Curie Temperature Distributions on User Areal Density of HAMR

IEEE Transactions on Magnetics has published an article written by Simon John Greaves; RIEC, Tohoku University, Sendai, Japan, Hirofumi Suto; National Institute for Materials Science, Tsukuba, Ibaraki, Japan, Yasuaki Nakamura; Graduate School of Science and Engineering, Ehime University, Matsuyama, Japan, and Yasushi Kanai, Dept. of Engineering, Niigata Institute of Technology, Kashiwazaki, Japan.

Abstract: “The effect of Curie temperature distributions and average grain size on the user areal density (UAD) of heat-assisted magnetic recording media was calculated for target areal densities of 2, 3 and 4 Tbit/in ² . A grain switching probability model was used to write tracks and the bit error rate evaluated, allowing the UAD to be calculated. A 10% Curie temperature distribution reduced the UAD by 0.5 – 0.8 Tbit/in ² , with larger reductions for media with smaller grains. The effect of the reader on the UAD was also evaluated and found to be less significant for media with T_c distributions.“