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US 8,557,408 B2Granted
Perpendicular media with dual soft magnetic layers
AssigneeSeagate Technology LLC
InventorsQixu Chen, Charles Brucker, Chung-Hee Chang, Tom Nolan, Samuel Dacke Harkness, IV
Life of this patent
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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.
Claims16
A magnetic stack comprising:
- a substrate;
- a first soft magnetic underlayer comprising material selected from the group of CoZrNb, CoZrTa, and combinations thereof, and a second soft magnetic underlayer comprising material selected from the group of FeCoB, FeCrCoB, FeTaC, CoFeZr, CoFeTa, FeCoZrB, FeCoC, FeCoTaZr, FeCrTaC, CoFeCrZr, CoFeCrTa, FeCoCrZrB, FeCoCrC, and FeCoCrTaZr, on the substrate without a spacer layer between the first and second soft magnetic underlayers;
- and
- a magnetic recording layer having a growth direction with less than 4° full width half maximum (FWHM) of x-ray diffraction (XRD) rocking curves around the (0002) peaks, wherein the second soft magnetic underlayer is between the first soft magnetic underlayer and the magnetic recording layer and is the soft magnetic underlayer closest to the magnetic recording layer, wherein the magnetic stack includes one or both of:
- a third soft magnetic underlayer between the substrate and the first soft magnetic underlayer;
- and
- at least one of the soft magnetic layers is configured to provide a template for orienting the magnetic recording layer.
4 more elements
A method comprising:
- depositing a soft underlayer structure including a first soft magnetic underlayer comprising material selected from the group of CoZrNb, CoZrTa, and combinations thereof, and a second soft magnetic underlayer comprising material selected from the group of FeCoB, FeCrCoB, FeTaC, CoFeZr, CoFeTa, FeCoZrB, FeCoC, FeCoTaZr, FeCrTaC, CoFeCrZr, CoFeCrTa, FeCoCrZrB, FeCoCrC, and FeCoCrTaZr, without a spacer layer between the first and second soft magnetic underlayers;
- depositing a magnetic recording layer having a growth direction with less than 4° full width half maximum (FWHM) of x-ray diffraction (XRD) rocking curves around the (0002) peaks, the second soft magnetic underlayer arranged between the first soft magnetic underlayer and the magnetic recording layer wherein the second soft magnetic underlayer is the soft magnetic underlayer closest to the magnetic recording layer, wherein depositing the soft underlayer structure includes one or both of:
- depositing a third soft magnetic underlayer between the substrate and the first soft magnetic underlayer;
- and
- depositing at least one soft magnetic layer configured to provide a template for orienting the magnetic recording layer.
2 more elements
Dependencies are inferred from the claim text.