Laminated plated pole pieces for thin film magnetic transducers

Details Laminated plated pole pieces for thin film magnetic transducers Laminated plated pole pieces for thin film magnetic transducers

1998-03-26

1999-08-17

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Core

360113, G11B 5147, G11B 533

Patent

active

059402539

ABSTRACT:
The pole pieces of a thin film head are formed by two thin film layers of the magnetic metal NiFe, each NiFe layer being about 20,000 angstroms thick. These two NiFe layers are separated by an electrically insulating layer of alumina (Al.sub.2 O.sub.3), ceramic or NiFe oxide that is about 100 angstroms thick. In one embodiment, a hard-baked photoresist layer is formed only around the edges of the first NiFe layer, the electrically insulating layer is deposited over the top surface of the first NiFe layer and over the hard-baked photoresist layer, and the second NiFe layer is then deposited, thus providing a three-layer metal/insulator/metal pole piece wherein the hard baked photoresist blocks edge short circuiting between the two thin film NiFe layers. In another embodiment, edge short circuiting is minimized by allowing a small filament(s) of a high electrical resistance plating seed layer of NiFe to extend between the two NiFe thin film layers, the high resistance of these long and thin NiFe filaments being much greater than the resistance of the two NiFe thin film layers.

REFERENCES:
patent: 5134533 (1992-07-01), Friedrich et al.
patent: 5195006 (1993-03-01), Morikawa
patent: 5349745 (1994-09-01), Kawabe et al.
patent: 5379172 (1995-01-01), Liao
patent: 5406434 (1995-04-01), Amin et al.
patent: 5488528 (1996-01-01), Chen et al.
patent: 5537278 (1996-07-01), Yaegashi et al.
patent: 5590008 (1996-12-01), Tanabe et al.

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