R&D: Optimising Thickness and Diameter of Dual Structure Patterned Media Dots for HAMR

IEEE Transactions on Magnetics has published an article written by Hikaru Yamane, Simon John Greaves, and Yoichiro Tanaka, RIEC, Tohoku University, Sendai, 980-8577, Japan.

Abstract: “Dual structure bit patterned media were optimised for heat assisted magnetic recording. Each dot contained two discrete recording structures and was therefore able to store two bits of information. The optimised parameters were the dot diameter and the thicknesses of the recording structures. Analysis of the thermal stability of the magnetisation at elevated temperatures suggested a design with a thicker recording structure on the bottom, where the head field was weaker, and a thinner structure on the top. Recording simulations showed that the optimal design could lead to user areal recording densities in excess of 9 Tbit/in².“