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US 10,896,693 B1Granted
Negative thermal expansion layer for heat assisted magnetic recording media
AssigneeSeagate Technology LLC
InventorsLihong Zhang, Xiong Liu, Hongbo Wang, Xinwei Li
Life of this patent
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Abstract
A stack comprises a substrate, a magnetic recording layer, and a negative thermal expansion layer disposed between the substrate and the magnetic recording layer. The negative thermal expansion layer is configured to reduce thermal profile changes of a surface of the stack opposite the substrate during a heat assisted magnetic recording write operation.
Claims20
A stack comprising:
- a substrate;
- a magnetic recording layer;
- a soft magnetic underlayer disposed between the magnetic recording layer and the substrate;
- and
- a negative thermal expansion (NTE) layer having a thickness of about 300 nm to about 600 nm and disposed between the substrate and the soft magnetic underlayer, the NTE being configured to reduce thermal protrusion of a surface of the stack opposite the substrate in a local region to less than about 0.5 nm when the magnetic recording layer is heated to a magnetic writing temperature of the magnetic recording layer.
2 more elements
A stack comprising:
- a substrate;
- a magnetic recording layer;
- and
- a negative thermal expansion (NTE) layer disposed between the substrate and the magnetic recording layer, wherein the NTE layer comprises a plurality of sub-layers wherein at least one sub-layer of the plurality of sub-layers has a negative thermal expansion coefficient that is different from at least another sub-layer of the plurality of sub-layers.
1 more element
A method comprising:
- forming a negative thermal expansion (NTE) layer over a substrate, wherein the NTE layer comprises a plurality of sub-layers wherein at least one sub-layer of the plurality of sub-layers has a negative thermal expansion coefficient that is different from at least another sub-layer of the plurality of sub-layers;
- forming at least one soft magnetic underlayer over the NTE layer;
- and
- forming a magnetic recording layer over the soft magnetic underlayer.
1 more element
Dependencies are inferred from the claim text.