Bw. Yang et al., READOUT SCHEME BY PULSED IRRADIATION CENTER APERTURE DETECTION ON MAGNETICALLY INDUCED SUPER RESOLUTION MAGNETOOPTICAL DISKS, JPN J A P 1, 35(1B), 1996, pp. 419-422
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.