Simulation Study of Bit Patterned Media with Inclined Anisotropy for Recording Density of 5 Tbit/in2

Abstract

Recording simulation at 5 Tbit/in 2 was studied for bit patterned media with inclined anisotropy. Magnetic dot was modeled as 7.5×10×5 nm 3 with saturation magnetization of 1000 emu/cm 3 and average anisotropy field of 22 kOe, and the dots were arranged with 10 and 12.5 nm in down-and cross-track periods, respectively, on a soft magnetic underlayer. The magnetic anisotropy of the dots was set at 30 degrees from longitudinal direction. Maximum filed of around 15 kOe was obtained for a shielded planar head with a pole size of 10×45 nm 2 in spite of relatively large head-medium spacing of 6 nm. Recording with the head revealed large write shift margins of around 5 nm in down-and cross-track directions. On track recording simulation indicated tolerances of around 4 % in anisotropy field dispersion and 4 degrees in orientation dispersion.