Substantially isotropic magnetic recording medium comprising a seedlayer
AssigneeSeagate Technology LLC
InventorsXing Song, Qixu Chen, Charles Leu, Rajiv Yadav Ranjan
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Abstract
A high areal density magnetic recording medium exhibiting high Hc, high SNR, high S* and substantially isotropic magnetic properties is achieved by depositing a thin seedlayer before depositing the underlayer. Embodiments include heating the seedlayer under vacuum in the presence of residual oxygen to induce appropriate crystalline orientation and surface morphology for nucleation and growth of the underlayer and magnetic layer having substantially isotropic magnetic properties.
Claims19
A magnetic recording medium comprising:
- a non-magnetic substrate;
- a chromium or chromium alloy seedlayer on the non-magnetic substrate;
- an underlayer on the seedlayer;
- and
- a magnetic layer on the underlayer;
- wherein the magnetic layer exhibits substantially directional magnetic isotropy.
A method of manufacturing a magnetic recording medium, which method comprises:
- depositing a chromium or chromium alloy seedlayer on a non-magnetic substrate, wherein the grains lying in a plane are randomly oriented;
- depositing an underlayer on the seedlayer;
- and
- depositing a magnetic layer on the underlayer;
- wherein the magnetic layer exhibits substantially directional magnetic isotropy.
Dependencies are inferred from the claim text.