Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1988-12-23
1991-01-22
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 539
Patent
active
049875086
ABSTRACT:
The invention teaches modifying the shape of a bar magnet which is uniformly magnetized either in the direction of its height or width to increase the volume of magnetic material at each end of the magnet. This results in increased magnetic field contribution from the magnet ends which modifies the field direction at the magnet faces so that the field lines converge rather than diverge just as they enter and leave the central portion of the magnet. Further along the field direction, the field lines change from being convergent to again being divergent, as is the usual case for a conventional bar magnet. Because of this transition there is an extended region over which the field lines are effectively straight and parallel, i.e. the field is uniform. This uniformity has been attained without increasing the length of the magnet, and a bar magnet so modified according to the teaching of the invention is suitable for the uniform biasing of MR elements in a single track or in a multitrack head.
REFERENCES:
patent: 3493694 (1970-02-01), Hunt
patent: 3796859 (1974-03-01), Thompson
patent: 4623867 (1986-11-01), Lundquist et al.
Eastman Kodak Company
Monteith Dennis P.
Tupper Robert S.
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