Domain expansion rom media with adapted domain shape for improved readout
AssigneeKoninklijke Philips Electronics N.V.
InventorsCoen Verschuren, Ferry Zijp
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Abstract
The present invention relates to a domain expansion storage medium and manufacturing method with improved readout performance. The substrate of the storage medium and/or its storage layer is processed to define a predetermined shape of magnetic domains, adapted to the front of the thermal reading profile. In particular, reversed crescent shaped domains flipped in the track directions are defined. This allows improved resolution and jitter values.
Claims10
A domain expansion storage medium in which a magnetic wall is displaced to thereby enlarge a magnetic domain in a readout layer so as to reproduce an information indicated by a magnetic domain in a storage layer, wherein a substrate of said storage medium has a locally modified surface structure or said storage layer has a locally modified magnetic property, arranged to define a predetermined shape of said magnetic domain, said predetermined shape having a curvature adapted to a predetermined thermal reading profile.
A method of manufacturing a domain expansion storage medium, in which a magnetic wall is displaced to thereby enlarge a magnetic domain in a readout layer so as to reproduce an information indicated by a magnetic domain in a storage layer, said method comprising the step of locally processing the surface structure of a substrate of said storage medium or the magnetic properties of said storage layer so as to define a predetermined shape of said magnetic domain, said predetermined shape having a curvature adapted to a predetermined thermal reading profile.
Dependencies are inferred from the claim text.