Abstract
Rear Expansion Detection (RED) magneto-optical media with different intermediate layers were studied to investigate the mechanism of domain expansion readout. A TM-rich GdFe-M intermediate layer was found to improve the readout margin. A domain written with light intensity modulation (LIM) expands with the wall energy gradient as a driving force under a readout field, compensating for the shrinkage force of an expanding domain. After the expansion, the expanded domain shrinks through wall motion toward the high temperature region with the wall energy gradient as a shrinking force. The above intermediate layer reduces friction during wall motion by reducing both wall coercivity and the demagnetizing field. Domains written with laser pulse magnetic field modulation (LP-MFM) were found to expand with a zero field if the groove wall angle of the substrate is sufficiently high. At mark length of less than 0.3 μm, the shape of marks written with LP-MFM are more suitable for RED.
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