Thin film magnet head for vertical magnetization

US4987510A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Herbert Schewe · Herzogenaurach, DE
• Dietrich Stephani · Bubenreuth, DE

Key dates

• Filing date: Dec 9, 1988
• Grant date: Jan 22, 1991
• Expiry date: Dec 9, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/1278
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

The thin film magnet head is to be guided over a recording medium to be magnetized perpendicularly, in which flux changes are to be registered along a track with a predetermined record wavelength and flux change density. The magnet head contains a flux-carrying, ring head-like guiding element with two magnet legs which constitute magnet poles which are arranged one behind the other and separated by a gap of predetermined width and having predetermined extents in the movement direction. With this magnet head the expanse for signal processing in a write/read channel is to be reduced. The magnet head fulfills this end by at least approximately satisfying the following relation: EQU .lambda.*=g+max(A.sub.1, A.sub.2) .lambda.* being the record wavelength which results for the value D.sub.p of the flux change density at which the read voltage of the magnet head is maximum; g, the width of the gap; and max(A.sub.1, A.sub.2) the greater value of the two extents (A.sub.1, A.sub.2) of the magnet poles.