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US 8,147,996 B2Granted
Perpendicular media with dual soft magnetic layers
AssigneeSeagate Technology LLC
InventorsQixu Chen, Charles Frederick Brucker, Chung-Hee Chang, Thomas Patrick Nolan, Samuel Dacke Harkness, IV
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Abstract
A recording medium having a substrate, a first soft magnetic underlayer, a second soft magnetic underlayer and a perpendicular magnetic recording layer without a spacer layer between the first and second soft magnetic underlayers is disclosed.
Claims24
A perpendicular recording medium comprising:
- a substrate;
- a first soft magnetic underlayer and a second soft magnetic underlayer on the substrate without a spacer layer between the first and second soft magnetic underlayers;
- and
- a magnetic recording layer, wherein the second soft magnetic underlayer is between the first soft magnetic underlayer and the magnetic recording layer, and the first soft magnetic underlayer comprises a material with an absolute value of magnetostriction constant less than 5*10−6.
1 more element
A perpendicular recording medium comprising:
- a substrate;
- a first soft magnetic underlayer on the substrate, the first soft magnetic underlayer comprising a material with an absolute value of magnetostriction constant less than 5*10−6;
- a second soft magnetic underlayer on the first soft magnetic underlayer, the second soft magnetic underlayer comprising FeCoB;
- and
- a magnetic recording layer, wherein the second soft magnetic underlayer is between the first soft magnetic underlayer and the magnetic recording layer, and the second soft underlayer provides a template for orienting the magnetic recording layer to have a growth direction with less than 4 degrees FWHM of XRD rocking curves around the (0002) peaks.
2 more elements
A perpendicular recording medium comprising:
- a substrate;
- a first soft magnetic underlayer on the substrate, the first soft magnetic underlayer comprising at least one of CoZrNb or CoZrTa;
- a second soft magnetic underlayer on the first soft magnetic underlayer, the second soft magnetic underlayer comprising FeCoB;
- and
- a magnetic recording layer, the second soft magnetic underlayer between the first soft magnetic underlayer and the magnetic recording layer,
- wherein the first soft magnetic underlayer has a magnetostriction constant less than 5*10−6, and
- wherein the magnetic recording layer has a growth direction with less than 4 degrees FWHM of XRD rocking curves around the (0002) peaks.
4 more elements
Dependencies are inferred from the claim text.