Soft magnetic underlayer (SUL) for perpendicular recording medium
OwnerYukiko Kubota, Dieter Weller +1inventors
InventorsYukiko Kubota, Dieter Weller, Mei-Ling Wu
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Abstract
A soft magnetic underlayer for a perpendicular recording medium includes a iron-cobalt alloy as the soft magnetic underlayer. In a preferred embodiment the iron-cobalt alloy is also alloyed with boron. The magnetic underlayer is radially textured such that the magnetic recording material has a magnetically easy axis in the radial direction and a magnetically hard axis in the circumferential direction.
Claims28
A magnetic recording medium comprising:
- a substrate;
- a non-magnetic spacer material on the substrate;
- and
- a soft magnetic underlayer on the non-magnetic spacer material, the soft magnetic underlayer containing iron, cobalt and boron.
A method of manufacturing a perpendicular magnetic recording medium, the method comprising:
- providing a substrate;
- depositing a non-magnetic spacer material on the substrate;
- depositing a soft magnetic underlayer containing iron, cobalt and boron on the non-magnetic spacer material;
- and
- depositing a perpendicular magnetic recording material on the soft magnetic underlayer.
A method of manufacturing a magnetic recording medium, the method comprising:
- providing a substrate;
- depositing a first non-magnetic spacer material on the substrate;
- depositing a soft magnetic underlayer containing iron, cobalt and boron on the non-magnetic spacer material;
- and
- depositing a second non-magnetic spacer material on the soft magnetic underlayer.
Dependencies are inferred from the claim text.