Thin film magnetic head with stress relief layering

Details Thin film magnetic head with stress relief layering Thin film magnetic head with stress relief layering

1993-02-19

1999-09-07

Cao, Allen T.

Dynamic magnetic information storage or retrieval

Head

Core

G11B 5147

Patent

active

059496274

ABSTRACT:
A thin film magnetic head is fabricated having soft metal layers of 0.25 to 1 micron thickness disposed on each side of the first and second magnetic layers of Permalloy forming the magnetic yoke. The soft layers are formed between the ceramic substrate and the first Permalloy layer, between the first Permalloy layer and the insulation surrounding the electrical coil of the head, between the insulation and the second Permalloy layer, and between the second Permalloy layer and the insulating overcoat of the head. The soft metal has a coefficient of thermal expansion between that of the Permalloy and that of the ceramic substrate and insulation materials. In this way, stress buffers are provided to minimize the mismatch and thermal stress transfer between the Permalloy and the other materials of the adjacent layers, resulting in improved domain stability and a significant reduction in popcorn noise.

REFERENCES:
patent: 4652954 (1987-03-01), Church
patent: 4716484 (1987-12-01), Kaminaka et al.
patent: 4780781 (1988-10-01), Sano et al.
patent: 4943879 (1990-07-01), Takano et al.
patent: 4951166 (1990-08-01), Schewe
patent: 5032944 (1991-07-01), Ohdoi
patent: 5126907 (1992-06-01), Hamakawa et al.
patent: 5241440 (1993-08-01), Ashida et al.
patent: 5296993 (1994-03-01), Aboaf et al.

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