Dynamic magnetic information storage or retrieval – Head – Core
Patent
1991-05-31
1993-03-30
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
Core
360119, G11B 5127, G11B 523
Patent
active
051989492
ABSTRACT:
A thin film magnetic head has a lower magnetic layer and an upper magnetic layer formed over the lower magnetic layer so that a small gap is formed between a magnetic gap section of the lower magnetic layer near a sliding surface to be brought into sliding contact with a magnetic recording medium and a magnetic gap section of the upper magnetic layer extending in parallel to the magnetic gap section of the lower magnetic layer near the sliding surface. The upper magnetic layer has a first sloping section extending from the magnetic gap section at an inclination .theta..sub.1 in a range defined by 2.degree..ltoreq..theta..sub.1 .ltoreq.25.degree. to the upper surface of the lower magnetic layer, and a second sloping section extending from the first sloping section at an inclination .theta..sub.2 in a range defined by: 30.degree..ltoreq..theta..sub.2 .ltoreq.80.degree. to the upper surface of the lower magnetic layer. Magnetic flux leaks across the lower magnetic layer and the first inclined section of the upper magnetic layer, so that the magnetic saturation of the magnetic gap section of the upper magnetic layer is prevented. Since the second sloping section is inclined at a large inclination, the overwrite characteristics is not deteriorated.
REFERENCES:
patent: 4190872 (1980-02-01), Jones, Jr. et al.
patent: 4511942 (1985-04-01), Valstyn
patent: 4636897 (1987-01-01), Nakamura et al.
patent: 4853815 (1989-08-01), Diepers
patent: 4854035 (1989-08-01), Gukkenberger et al.
Ishikawa Wataru
Narisawa Hiroaki
Saito Norio
Sato Jin
Watanabe Takashi
Sony Corporation
Tupper Robert S.
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