Thermally-assisted recording (TAR) disk with low thermal-conductivity underlayer
AssigneeHGST Netherlands B.V.
InventorsLidu Huang, Andrew Thomas McCallum, Simone Pisana
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Abstract
A thermally-assisted recording (TAR) disk has an improved insulating layer beneath the chemically-ordered FePt (or CoPt) alloy recording layer. The insulating layer is a solid substitution crystalline alloy MgXO, where the element X is selected from nickel (Ni) and cobalt (Co). The composition of the MgXO crystalline solid substitutional alloy is of the form (Mg(100-y)Xy)O where y is between 10 and 90, and more preferably between 20 and 80. An optional layer of crystalline “pure” MgO may be located between the MgXO layer and the FePt recording layer and in contact with the recording layer, or between an underlayer and the MgXO layer.
Claims20
A thermally-assisted recording (TAR) disk comprising:
- a substrate;
- an underlayer on the substrate;
- a layer of a crystalline solid substitutional alloy of MgXO on the underlayer, where X is selected from Ni and Co;
- and
- a magnetic recording layer comprising a chemically-ordered alloy selected from FePt, and CoPt on the MgXO layer.
A thermally-assisted recording (TAR) disk comprising:
- a substrate;
- an insulating layer of a crystalline solid substitutional alloy having a composition of the form (Mg(100-y)Niy)O, where y is between 20 and 80;
- a seed layer between the substrate and the insulating layer and in contact with the insulating layer;
- a magnetic recording layer comprising a chemically-ordered FePt alloy on and in contact with the insulating layer.
Dependencies are inferred from the claim text.