Transverse biased shields for perpendicular recording to reduce stray field sensitivity
AssigneeMaxtor Corporation
InventorsBruce Lairson, Mark Nichols, Hai Chi Nguy, Tim Glassburn
Life of this patent
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Abstract
A method for reducing flux concentrating capacity of a shield in a magnetic read/write head positioned to read perpendicular residual magnetic fields on a magnetic media. Permeability of the shield is reduced in a direction oriented perpendicular to the magnetic media by inducing a transverse magnetic bias field within the shield.
Claims18
A perpendicular magnetic head comprising:
- a magnetoresistive read device positioned to read perpendicular residual magnetic fields on a magnetic media in proximity with the read device;
- a shield at least partially surrounding the read device comprising a magnetic material having an orientation selected to capture stray magnetic fields;
- and
- a transverse magnetic bias field within the shield.
A perpendicular magnetic write head comprising:
- a magnetoresistive write device positioned to write perpendicular residual magnetic fields on a magnetic media in proximity with the write device;
- a shield at least partially surrounding the write device comprising a magnetic material having an orientation selected to capture stray magnetic fields;
- and
- a transverse magnetic bias field within the shield.
A magnetic data storage device comprising:
- a perpendicular recording medium;
- a read/write head;
- drive electronics coupled to position the read/write head over selected locations of the perpendicular recording medium;
- a read element within the read/write head;
- a write element within the read/write head;
- a shield at least partially surrounding the read device comprising a magnetic material having an orientation selected to capture stray magnetic fields;
- and
- a transverse magnetic bias field within the shield.
A method for reducing flux concentrating capacity of a shield, said shield at least partially surrounding a magnetoresistive read device positioned to read perpendicular residual magnetic fields on a magnetic media, said method comprising:
- reducing permeability of said shield in a direction oriented perpendicular to said magnetic media by inducing a transverse magnetic bias field within said shield.
The method of claim 17, wherein said step of inducing a transverse magnetic bias field within the shield further comprises inducing said transverse magnetic field bias within said shield by field anneal to induce magnetocrystalline anisotropy.
Dependencies are inferred from the claim text.