Magnetic recording media and method of forming them
AssigneeHitachi, Ltd.
InventorsChiseki Haginoya, Kaori Suzuki, Hisashi Kimura, Masaaki Futamoto, Hideo Matsuyama
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Abstract
The present invention is directed to-carrying out a high density magnetic recording to a material having a large coercive force by perpendicular magnetic recording head. By giving a patterning onto a soft magnetic under layer of a perpendicular two-layer recording media in sync with a period of a recording bit, a magnetic field from a write head can be allowed to converge to a soft magnetic column. Therefore, a magnetization reversal of the magnetic recording media material having a large anisotropic constant becomes possible, and then a high density magnetic recording can be achieved.
Claims26
A magnetic recording media having a substrate, a soft magnetic layer formed on the substrate, a hard magnetic layer formed on the soft magnetic layer and for recording magnetized information, wherein,
- the soft magnetic layer comprises a plurality of columns which configure a plurality of tracks disposed in discrete manner from each other, have a permeability higher than that of the hard magnetic layer and allow magnetic flux from a magnetic head to converge, and a flat region which magnetically couples the plurality of columns so as to configure a magnetic path which refluxes to the magnetic head the magnetic flux thus converged into the columns.
A magnetic recording media having a substrate, an under layer formed on the substrate, and a magnetic layer formed on the under layer, wherein,
- the under layer comprises columns regularly arranged, and a permeability of the columns is higher than the permeability of the magnetic layer.
A method for forming a perpendicular magnetic recording media, comprising steps of:
- forming a soft magnetic under layer on a substrate directly or via a foundation layer,
- forming a magnetic layer on the soft magnetic under layer directly or via an intermediate layer, and further including a step of forming a concavity and convexity on a surface of the soft magnetic under layer.
Dependencies are inferred from the claim text.