READOUT SCHEME BY PULSED IRRADIATION CENTER APERTURE DETECTION ON MAGNETICALLY INDUCED SUPER RESOLUTION MAGNETOOPTICAL DISKS

Magnetically induced super resolution (MSR) is used to read ''below-di ffraction-limit'' recording marks on magneto-optical (MO) media. A nan osecond-order laser pulse irradiated onto MO media can create a quasic ircular temperature profile, thereby yielding a quasi-circular sub-mu m aperture to effectively derive a readout signal from sub-mu m marks recorded on the disks. In this study, the pulsed irradiation and conve ntional DC readout methods are applied to a MO disk with a center aper ture detection (CAD) structure to quantitatively evaluate their readou t performance. The size and shape of the effective aperture, jitters d ue to readout parameters; and aperture wall width generated are studie d. The feasibility of the pulsed irradiation readout is then assessed.