Abstract
The readout signal waveform and recorded mark of magneto-optic write media are investigated using the magnetic field modulation method. Because overwrite is possible in the magnetic field modulation method, it has been applied to a small magneto-optic disk in a new audio media system. the magneto-optic mark recorded by this system has a chevron shape, and the width is highly sensitive to changes in such factors as laser power or ambient temperature. For this reason, it is necessary to design the recording medium so that a sufficiently stable readout signal is obtained for these changes. A numerical integral obtained by polygonal approximation of recorded mark is used, and the readout signal waveform is determined by simulation. By this technique, the readout signal amplitude and crosstalk level that influence the medium and the recording density are determined. Based on this result, the write density of the medium is computed and comparison with measurement values indicates that agreement is excellent. Moreover, by adjusting the tracking offset during readout, it is possible to improve the apparent write power margin. Thus, the technique will be very effective in the design of future high-density recording media.
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