Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1997-03-19
1998-05-05
Heinz, A. J.
Dynamic magnetic information storage or retrieval
Head
Hall effect
G11B 539
Patent
active
057484163
ABSTRACT:
An SAL-type magnetoresistive playback head that is highly sensitive and that limits Barkhausen noise is provided by optimizing the magnetic properties of the permanent magnet film. On top of a lower insulating layer are stacked a soft magnetic bias film (SAL film), a magnetic separating film (shunt film), a magnetoresistive film (MR film), and an upper insulating layer, in that order. The outer sides of the track of the MR film are in direct contact with the permanent magnet film or in indirect contact via a base film. Alternatively, the present invention relates to a spin-valve magnetoresistive playback head. On top of a lower insulating layer are stacked an anti-ferromagnetic film, a fixed magnetizing film, a magnetic separating film, a movable magnetizing film (MR film), and an upper insulating layer, in that order. The outer sides of the track of the movable magnetizing film are in direct contact with the permanent magnet film or in indirect contact via a base film. In either type of playback head, Barkhausen noise is eliminated by using a CoCrPt alloy film having a composition that provides the magnetic properties needed for a permanent magnet film that can handle narrow tracks and narrow gaps, and by specifying a ratio between the thicknesses of the MR film and the permanent magnet film.
REFERENCES:
patent: 5408377 (1995-04-01), Gurney
Kawai Tetsurou
Liao Simon
Mitsumata Chiharu
Miura Hisayuki
Tobise Masahiro
Applied Magnetics Corporation
Heinz A. J.
Hitachi Metals Ltd.
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