Method of magnetic transfer for perpendicular recording medium
AssigneeFuji Electric Co., Ltd.
InventorAkira Saito
Life of this patent
Estimating the term…
Abstract
Recording of preformat information is accomplished by magnetic transfer to a perpendicular magnetic recording medium with a higher density. The method includes: (1) an initialization step, in which a magnetic field is applied to the magnetic recording medium in the direction perpendicular to the medium surface and direction of magnetization of the whole surface of the magnetic recording medium is aligned to one direction perpendicular to the medium surface, and (2) a magnetic transfer step, in which a magnetic field in the longitudinal direction is applied to both a master disk carrying preformat information and the magnetic recording medium with the master disk in close contact with or in proximity to one or both surfaces of the magnetic recording medium.
Claims17
A method of magnetic transfer for a perpendicular magnetic recording medium comprising the steps of:
- initializing said magnetic recording medium by applying a magnetic field to said magnetic recording medium in a direction perpendicular to a surface of said magnetic recording medium so that a direction of magnetization of the surface of said magnetic recording medium is aligned in one direction, perpendicular to said magnetic recording medium;
- and
- magnetically transferring preformat information to a magnetic recording layer of said magnetic recording medium by applying an external magnetic field in a direction parallel to the surface of said magnetic recording medium to said magnetic recording medium and a master disk positioned in close contact with or in proximity to one surface of said magnetic recording medium;
- wherein said master disk has a non-magnetic substrate and a plurality of isolated linear regions composed of soft magnetic material on a surface of or in a surface portion of said non-magnetic substrate;
- said soft magnetic material having a pattern corresponding to said preformat information and being disclosed in the linear regions.
A method of magnetic transfer for a perpendicular magnetic recording medium comprising the steps of:
- providing said magnetic recording medium in uninitialized form;
- and
- magnetically transferring preformat information to a magnetic recording layer of said magnetic recording medium applying an external magnetic field in a direction parallel to the surface of said magnetic recording medium to said magnetic recording medium and a master disk positioned in close contact with or in proximity to one surface of said magnetic recording medium;
- wherein said master disk has a non-magnetic substrate and a plurality of isolated linear regions composed of soft magnetic material on a surface of or in a surface portion of said non-magnetic substrate;
- said soft magnetic material having a pattern corresponding to said preformat information and being disposed in the linear regions.
A method of magnetic transfer for a perpendicular magnetic recording medium, comprising the steps of:
- providing the perpendicular magnetic recording medium in uninitialized form;
- providing a master disk positioned in close contact with or in proximity to one surface of said magnetic recording medium, the master disk having a non-magnetic substrate and a soft magnetic pattern corresponding to preformat information to be transferred to the magnetic recording medium;
- and
- magnetically transferring the preformat information to a magnetic recording layer of said magnetic recording medium by magnetizing said magnetic recording layer in a direction perpendicular to the surface of magnetic recording medium with leakage flux from the soft magnetic pattern by applying an external magnetic field in a direction parallel to the surface of the magnetic recording layer to the magnetic recording medium and the master disk.
Dependencies are inferred from the claim text.