低再生磁界D-RAD

概要

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Recently many types of magnetically induced super-resolution (MSR) have been proposed for high-density recording on magneto-optical (MO) disks. Among them, double-mask rear-aperture detection (D-RAD) is the most promising, because of its high resolution and its crosstalk advantage. However, F=RAD requires a high external magnetic field for MSR readout. We investigated MSR by D-RAD in order to reduce the readout magnetic field. By optimizing the structure of MSR by D-RAD, we achieved a small magnetic field of-100 Oe for readout. In recording on a D-RAD MO disk with land/groove recording, a C/N of more than 45dB for a mark length of 0.27μm and a crosstalk level of less than-40dB at a track pitch of 0.7μm were achieved. In addition, a combination of light intensity modulation direct overwrite (LIMDOM) with D-RAD was achieved by adding on MSR switching layer to D-RAD
社団法人日本磁気学会の論文
1998-04-15