Nonmetallic thin film magnetic recording disk with pre-seed layer
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsXiaoping Bian, Mary Frances Doerner, Tim Minvielle, Mohammad Taghi Mirzamaani, Kai Tang, Li Tang
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Abstract
The design of a magnetic thin film disk, for use in a disk drive, with an amorphous or nanocrystalline pre-seed layer preferably followed by a ruthenium-aluminum (RuAl) seed layer is described. The pre-seed layer may be CrTa or AlTi. The pre-seed layer deposited over a glass substrate, for example, allows a more strongly oriented RuAl seed layer to be deposited and, thus, favorably influences the orientation and grain size in the subsequent layers which include preferably at least one Cr alloy underlayer and at least one magnetic layer.
Claims22
A thin film magnetic disk comprising:
- a nonmetallic substrate;
- a pre-seed layer with an amorphous or nanocrystalline structure being directly deposited upon said substrate, said pre-seed layer consisting essentially of AlTi;
- a nonmagnetic ruthenium-aluminum (RuAl) seed layer having a B2 structure and being deposited upon the pre-seed layer;
- at least one nonmagnetic underlayer being deposited upon the RuAl seed layer;
- and
- at least one magnetic layer deposited over the underlayer.
A disk drive comprising:
- a motor for rotating a spindle;
- a thin film magnetic disk mounted on the spindle comprising a nonmetallic substrate, an amorphous or nanocrystalline pre-seed layer being directly deposited upon said substrate, said pre-seed layer consisting essentially of AlTi;
- and a RuAl seed layer with a B2 structure being deposited upon said pre-seed layer;
- and
- at least one nonmagnetic underlayer being deposited upon the RuAl seed layer;
- and
- at least one magnetic layer being deposited over said underlayer;
- and
- an actuator assembly including a head for writing magnetic information on the disk as it rotates.
A method of manufacturing a thin film magnetic disk comprising the step of:
- depositing a thin film pre-seed layer with an amorphous or nanocrystalline structure onto a nonmetallic substrate surface of a disk, said pre-seed layer consisting essentially of AlTi;
- depositing a crystalline ruthenium-aluminium (RuAl) seed layer having a B2 structure upon the pre-seed layer;
- depositing at least one nonmagnetic underlayer upon the RuAl seed layer;
- and
- depositing at least one magnetic layer over the underlayer.
Dependencies are inferred from the claim text.