Media Design Analysis for Thermally Assisted Magnetic Recording

概要

論文の詳細を見る
A media design for thermally assisted magnetic recording was simulated, with particular consideration given to data stability during the cooling process after writing, and data stability in the adjacent tracks at each time of rewriting. The areal density was assumed to be 2 Tbpsi. The targeted media and the recording type were of the granular media and the thermal gradient, respectively. Under the conditions that (1) the thermal stability factor at 330 K should be more than 60, (2) the cooling rate after writing should be less than 10 K/nm, and (3) the information on the adjacent tracks should be preserved at temperatures up to 330 K under the head field, it was found that an anisotropy constant of about 1-2 × 107 erg/cm3 is required for media with a thickness of 5-15 nm. Increasing the thickness is an effective means of decreasing the anisotropy constant, despite a decrease in the Curie temperature. By increasing the thickness, the limiting factor shifts from the thermal stability factor (1) to the information on the adjacent tracks (3). If the head field at the adjacent tracks can be decreased, the limiting factor for thick media will shift from the information on the adjacent tracks (3) to the cooling rate (2).