Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2008-03-25
2008-03-25
Tugbang, A. Dexter (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603160, C029S603180, C204S192340, C360S324000, C360S324110, C360S324120
Reexamination Certificate
active
07346977
ABSTRACT:
A method for making a magnetoresistive read head so that the pinned ferromagnetic layer is wider than the stripe height of the free ferromagnetic layer uses ion milling with the ion beam aligned at an angle to the substrate supporting the stack of layers making up the read head. The stack is patterned with photoresist to define a rectangular region with front and back long edges aligned parallel to the read head track width. After ion milling in two opposite directions orthogonal to the front and back long edges, the pinned layer width has an extension. The extension makes the width of the pinned layer greater than the stripe height of the free layer after the substrate and stack of layers are lapped. The length of the extension is determined by the angle between the substrate and the ion beam and the thickness of the photoresist.
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Cyrille Marie-Claire
Ding Meng
Dobisz Elizabeth Ann
Ho Kuok San
MacDonald Scott Arthur
Berthold Thomas R.
Hitachi Global Storage Technologies - Netherlands B.V.
Tugbang A. Dexter
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