Abstract
We have investigated the influence of groove shape and recording scheme on readout of rear expansion detection (RED) magneto optical media. Marks recorded by laser pulse magnetic field modulation (LP-MFM) were found to expand without a field while those recorded by light intensity modulation (LIM) required a field for expansion. Media with steep wall grooves showed a high carrier-to-noise ratio (CNR) of 42.7 dB at a mark length of 0.2 µm when recorded by LP-MFM and required a low readout field of less than 100 Oe even when recorded by LIM.
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