7 Gbit/in^2を超えるCAD-MSRタイプ光磁気ディスク

概要

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We developed a CAD-MSR (center-aperture-detection-type magnetically induced super-resolution) disk with a larger areal density than that of an AS-MO (advanced storage magneto-optical) disk. The magnetic properties of readout and recording magnetic films were modified to obtain higher readout resolution and fewer cross-write characteristics on tracks with a pitch of less than 0.6 μm. We confirmed the possibility of realizing 7 Gbit/in^2 areal density recording in the modified CAD-MSR disk with practical readout and recording power margins by using the same optics as in our previously reported AS-MO activity, namely, a 640-nm-wavelength laser and an objective lens with a numerical aperture of 0.6. The areal density is 1.5 times larger than that of the AS-MO disk, and it is possible to realize a capacity of over 9 Gbytes in a 120-mm-diameter single-side disk.
社団法人日本磁気学会の論文
1999-12-01