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US 9,542,968 B1Granted
Single layer small grain size FePT:C film for heat assisted magnetic recording media
AssigneeWD Media, LLC
InventorsHua Yuan, Alexander S. Chernyshov, B. Ramamurthy Acharya
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Abstract
FePt-based heat assisted magnetic recording (HAMR) media comprising a thick granular FePt:C magnetic recording layer capable of maintaining a single layer film having desirable magnetic properties. According to one embodiment, the thick granular FePt:C magnetic recording layer comprises a plurality of carbon doped FePt alloy columnar grains, where the plurality of carbon doped FePt alloy columnar grains comprise a carbon gradient along the thickness of the hard magnetic recording layer.
Claims11
A method of manufacturing a recording medium, comprising:
- forming a soft magnetic underlayer;
- forming a hard magnetic recording layer over the soft magnetic underlayer, wherein forming the hard magnetic record layer comprises:
- depositing a first sub-layer over the soft magnetic underlayer, the first sub-layer comprising a first carbon doped FePt alloy;
- and
- depositing a second sub-layer over the first sub-layer, the second sub-layer comprising a second carbon doped FePt alloy with a different carbon content by at % than the first carbon doped FePt alloy;
- and
- forming a soft magnetic layer over the hard magnetic recording layer, the soft magnetic layer comprising a CoFe or CoCr based soft magnetic alloy,
- wherein the hard magnetic recording layer comprises a plurality of carbon doped FePt alloy columnar grains, each of the plurality of carbon doped FePt alloy columnar grains comprising a carbon gradient along a thickness of the hard magnetic recording layer, wherein the different carbon content of the first and second sub-layers results, at least in part, in the carbon gradient.
5 more elements
Dependencies are inferred from the claim text.