Magnetic recording apparatus and magnetic head

Details Magnetic recording apparatus and magnetic head Magnetic recording apparatus and magnetic head

2007-05-22

2007-05-22

Nguyen, Hoa T. (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Magnetoresistive reproducing head

Reexamination Certificate

active

10206751

ABSTRACT:
Formation of magnetic domains in a perpendicularly magnetized medium comprising an underlayer of a soft magnetic layer is prevented by appropriate magnetic domain control in the soft magnetic layer. One method controls magnetic domains of the soft magnetic layer by applying an external magnetic field to the medium. Another method provides a mechanism in the magnetic head for generating a magnetic field to control the magnetic domains of the soft magnetic layer of the medium.

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Ariake et al. “Preparation of Double Layered Perpendicular Recording Media for Beyond 50 Gb/in2Areal Density,” IEEE Transactions on Magnetics 36:2411-2413 (2000).
Honda et al. “Effect of Soft Magnetic Underlayer on Magnetization Microstructure of Perpendicular Thin Film Media,” IEEE Transactions on Magnetics 36:2399-2401 (2000).
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Lairson et al. Disk Drive Integration Issues for Perpendicular Recording, IEEE Transactions on Magnetics 37:1223-1227 (2000).
Takano et al. “Possibility of 40 GB/in2Perpendicular Recording,” IEEE International Magnetics Conference (2000).

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