Magnetic head having two legs of predetermined saturation magnetization for a recording medium to be magnetized vertically

US4782416A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Bernhard Hillenbrand · Uttenreuth, DE
• Herbert Schewe · Herzogenaurach, DE

Key dates

• Filing date: Jun 11, 1987
• Grant date: Nov 1, 1988
• Expiry date: Jun 11, 2007

Classification

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

Abstract

A magnetic head comprising a stratified buildup on a non-magnetic substrate for a recording medium to be magnetized vertically comprises a ring head-like conducting body for carrying magnetic flux having two magnet legs which comprise several magnetic layers with predetermined saturation magnetization and delineate a space in between, through which the turns of an at least largely flat write/read coil winding extend. With this head it is possible to generate a sufficiently large read voltage, wherein the same advantages are present as if single-pole heads are used. The first magnet leg comprises, in the region of its pole, at least a first magnetic layer having a predetermined low saturation magnetization and the second magnet leg comprises, at least in the region of its pole, a magnetic layer, the saturation magnetization of which is larger than the saturation magnetization of the first magnetic layer of the first magnet leg, so that for the write function the pole area of the first magnetic layer is saturated magnetically due to a write current flowing in the coil winding. Preferably, the first magnet leg has, outside its pole area, at least one further magnetic layer comprising …