Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2008-07-22
2008-07-22
Heinz, Allen (Department: 2627)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
Reexamination Certificate
active
07403359
ABSTRACT:
A method is provided for inhibiting corrosion in a layer of Cu or other material in a GMR sensor, wherein the GMR sensor may be used in a magnetic data storage system such as a tape drive system to substantially improve read head sensitivity. The GMR sensor comprises stacked layers of ferromagnetic and non-magnetic materials. In one useful embodiment, a layer of Cu material is positioned between first and second layers of a specified ferromagnetic material, such as CoFe. Respective end surfaces of the Cu layer and first and second CoFe layers are initially located in substantially co-planar relationship with one another, in a common plane. The method further comprises etching the Cu layer to remove an amount of material therefrom. A new end surface is thus formed in the Cu layer, wherein the new end surface is selectively spaced apart from the common plane. A protective coating is then applied to the new end surface of the Cu layer, to inhibit corrosion of such layer. Usefully, a pole tip recession is formed at the ends of the first and second CoFe layers.
REFERENCES:
patent: 6989974 (2006-01-01), Tetsukawa et al.
patent: 7174622 (2007-02-01), Meyer et al.
House Herbert
Nibarger John P.
Brooks & Kushman P.C.
Heinz Allen
Storage Technology Corporation
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