Method of making magnetoresistive sensor with improved microtrac

Details Method of making magnetoresistive sensor with improved microtrac Method of making magnetoresistive sensor with improved microtrac

1997-02-12

1998-05-05

Hughes, S. Thomas

Metal working

Method of mechanical manufacture

Electrical device making

2960314, 2960315, 427131, 427132, G11B 5127

Patent

active

057459789

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 pinhole's. 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: 5404635 (1995-04-01), Das
patent: 5454158 (1995-10-01), Fontana, Jr. et al.
patent: 5580602 (1996-12-01), McKean et al.

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