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US 8,530,065 B1Granted
Composite magnetic recording medium
AssigneeWD Media, LLC
InventorsAlexander Chernyshov, Hua Yuan, B. Ramamurthy Acharya
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Abstract
A composite hard magnetic recording layer for a magnetic storage comprises a hard magnetic layer and a capping layer. The composite recording layer has a crystal structure where crystal grains include a portion within the magnetic layer and a portion within the capping layer.
Claims49
A recording medium, comprising:
- a composite hard magnetic recording layer consisting of a plurality of columnar grains having a crystallographic texture;
- and
- the composite hard magnetic recording layer comprising a hard magnetic layer and a capping magnetic layer disposed over the hard magnetic layer;
- wherein a given columnar grain of the plurality of columnar grains includes a first portion within the hard magnetic layer and a second portion within the capping magnetic layer
- wherein the composite hard magnetic recording layer has an L10 crystal structure and the crystallographic texture comprises a (001) texture;
- and
- wherein the hard magnetic layer comprises a FePt—C alloy.
4 more elements
A recording device comprising:
- a housing containing a recording head and a recording medium;
- the recording head for reading magnetic signals from, and writing magnetic signals to, the recording medium;
- and
- the recording medium comprising:
- a composite hard magnetic recording layer consisting of a plurality of columnar grains having a crystallographic texture;
- and
- the composite hard magnetic recording layer comprising a hard magnetic layer and a capping magnetic layer disposed over the hard magnetic layer;
- wherein a given columnar grain of the plurality of columnar grains includes a first portion within the hard magnetic layer and a second portion within the capping magnetic layer,
- wherein the composite hard magnetic recording layer has an L10 crystal structure and the crystallographic texture comprises a (001) texture;
- and
- wherein the hard magnetic layer comprises a FePt—C alloy.
8 more elements
A method of manufacturing a recording medium, comprising:
- forming a composite hard magnetic recording layer consisting of a plurality of columnar grains having a crystallographic texture by providing a hard magnetic layer and growing a capping magnetic layer on the hard magnetic layer such that a given columnar grain of the plurality of columnar grains includes a first portion within the hard magnetic layer and a second portion within the capping magnetic layer,
- wherein the composite hard magnetic recording layer has an L10 crystal structure and the crystallographic texture comprises a (001) texture, and
- wherein the hard magnetic layer comprises a FePt—C alloy.
Dependencies are inferred from the claim text.