Thin film magnetic disk with CoPtCrB layer
AssigneeInternational Business Machines Corporation
InventorsXiaoping Bian, Mary Frances Doerner, Mohammad Taghi Mirzamaani, Timothy Martin Reith
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Abstract
A thin film magnetic disk (and a disk drive using the magnetic disk) with improved recording performance having a thin seed layer consisting of tantalum (Ta), a suitable underlayer and a CoPtCrB magnetic layer is described. The underlayer is preferably a Cr alloy with a grain size which is smaller than that of pure Cr. CrTi is suitable as an underlayer. An appropriate overcoat such as hydrogenated carbon can be applied.
Claims22
A thin film magnetic disk comprising:
- a substrate;
- a seed layer comprising tantalum deposited onto the substrate;
- an underlayer comprising an alloy of chromium deposited onto the seed layer;
- and
- a magnetic layer comprising cobalt, platinum, chromium and boron deposited onto the underlayer.
A disk drive comprising:
- a thin film magnetic disk including:
- a substrate;
- a Ta seed layer
- an Cr alloy underlayer;
- and
- a CoPtCrB magnetic layer;
- means for rotating the thin film magnetic disk;
- a slider containing means for reading magnetic data;
- and
- means for positioning the slider over the thin film magnetic disk to read magnetic data from the disk.
A method of manufacturing a thin film disk comprising the steps of:
- sputtering a Ta seed layer onto a glass substrate;
- sputtering a chromium alloy underlayer onto the seed layer;
- and
- sputtering a magnetic alloy onto the underlayer comprising cobalt, platinum, chromium, and boron.
Dependencies are inferred from the claim text.