Thin film inductive transducer for perpendicular recording

Details Thin film inductive transducer for perpendicular recording Thin film inductive transducer for perpendicular recording

1981-10-30

1983-09-13

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Head

Core

360102, 360121, 360123, G11B 512, G11B 522

Patent

active

044046090

ABSTRACT:
A thin film inductive transducer is shown comprising three magnetic layers (10, 11, 12) deposited on a slider substrate (13) for perpendicular recording of magnetic transitions on a movable magnetic medium. Two magnetic closures are provided. One is defined by electrical contact of one outer magnetic layer (12 or 10) with the intermediate magnetic layer (11 or 11') within the area bounded by conductive turns (a-h) of single layer coil (19 or 19'). The other is defined by electrical contact (10, 12 or 10', 12') outboard of the conductive turns (a-h). Magnetic transitions may be read by conventional peak detection techniques because the disclosed transducer has three pole tips (P1, P2, P3), the central one P2 of which is approximately 33-40% of the thickness of the outer pole tips (P1, P3). To avoid "wrap-around", the pole tips (P1, P2, P3) are progressively narrower in width as their distance from the substrate (13) increases.

REFERENCES:
patent: 4052749 (1977-10-01), Nomura et al.
patent: 4127884 (1978-11-01), Nouchi et al.
patent: 4190872 (1980-02-01), Jones, Jr. et al.
patent: 4191983 (1980-03-01), Gibson
patent: 4219855 (1980-08-01), Jones, Jr.
patent: 4241367 (1980-12-01), Nomura et al.
patent: 4321641 (1982-03-01), Lee
IEEE Transactions on Magnetics, vol. MAG-16, #5, 9/80--"Self-Consistent Computer Calculations for Perpendicular Magnetic Recording".

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