Magneto-optic recording magnetic head having magnetic gap which has different sizes in magnetic field modulation mode and light modulation recording mode

摘要

A magneto-optic recording magnetic head applies first and second magnetic fields to a magneto-optic disk having a recording film. The first magnetic field is used in a magnetic field modulation mode and the second magnetic field is utilized in a light modulation mode. The head comprises a yoke formed of a magnetic substance and having an opposing surface which opposes the recording film of the magneto-optic disk. A magnetic gap is formed between the yoke and a main magnetic pole magnetically coupled to the yoke. A cross-sectional area of the gap on a plane parallel to the recording film of the magneto-optic recording medium changes depending on whether the first or second magnetic field is generated, to maximize strengths of the first and second magnetic fields in accordance with the distance between the opposing surface of the yoke and the recording film of the disk.