Title:
【発明の名称】磁気抵抗式再生ヘッドの一様なバイアスを与えるように形成された永久磁石
Document Type and Number:
Japanese Patent JPH04502528
Kind Code:
A
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.
Inventors:
Neil Smith
Application Number:
JP50188189A
Publication Date:
May 07, 1992
Filing Date:
December 18, 1989
Export Citation:
Assignee:
Eastman Kodak Company
International Classes:
G11B5/39; H01F7/02; (IPC1-7): G11B5/39
Attorney, Agent or Firm:
Kyozo Yuasa (5 people outside)