Metal working – Method of mechanical manufacture – Electrical device making
Patent
1995-05-23
1998-02-03
Hughes, S. Thomas
Metal working
Method of mechanical manufacture
Electrical device making
2960313, 2960314, 2960315, 2960327, 427131, 427132, G11B 5127
Patent
active
057131228
ABSTRACT:
A magnetoresistive sensor design and fabrication process that provides improved microtrack profile linearity for servo elements while simultaneously providing stable and linear data sensing elements suitable for high density tape head applications. The stability and uniformity of both data and servo sensor elements is enhanced through the use of a grating profile under both the soft film biased magnetoresistive sensor layer and the hard bias stabilizing magnets. Processing steps are eliminated by replicating the grating pattern for the servo sensor elements through a thick layer of alumina or silicon dioxide. The outer read shield is removed from the servo elements using a stripping process that eliminates structural damage arising from alumina pinholes. Both element types are free of significant Barkhausen noise and instability because of the grating-stabilized domains in both the active magnetoresistive regions and the passive hard-biasing regions of each sensor. Each servo sensor is disposed at a greater distance from the single shield to optimize the microtrack profile. The resulting reduction in servo sensor frequency response leaves sufficient bandwidth for precise servo positioning.
REFERENCES:
patent: 3840898 (1974-10-01), Bajorek et al.
patent: 4024489 (1977-05-01), Bajorek et al.
patent: 4477794 (1984-10-01), Nomura et al.
patent: 4556925 (1985-12-01), Suenaga et al.
patent: 4639806 (1987-01-01), Kira et al.
patent: 4663685 (1987-05-01), Tsang
patent: 4729048 (1988-03-01), Imakoshi et al.
patent: 4757410 (1988-07-01), Seko et al.
patent: 4843505 (1989-06-01), Mowry
patent: 4940511 (1990-07-01), Fontana, Jr. et al.
patent: 5018037 (1991-05-01), Krounbi et al.
patent: 5079035 (1992-01-01), Krounbi et al.
patent: 5123156 (1992-06-01), Meunier et al.
patent: 5454158 (1995-10-01), Fontana, Jr. et al.
Aboaf Joseph Adam
Denison Edward Virgil
Kahwaty Vincent Noel
Hughes S. Thomas
International Business Machines - Corporation
LandOfFree
Hard-film stabilized soft-film biased magnetoresistive sensor wi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hard-film stabilized soft-film biased magnetoresistive sensor wi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hard-film stabilized soft-film biased magnetoresistive sensor wi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-653378