Magnetic head for magneto-optical recording and magneto-optical recording apparatus in which a magnetic core mounted to a slider has particular dimensions and properties

A magneto-optical recording apparatus comprising:

• an optical head for irradiating a magneto-optical recording medium with a light spot;
• and
• a magnetic head for applying a magnetic field to the magneto-optical recording medium, said magnetic head comprising a slider sliding on the magneto-optical recording medium, a core made of a magnetic material and mounted to said slider, and a coil wound around said core, wherein upon application of a voltage to said coil a modulation magnetic field is applied to a recording surface of the magneto-optical recording medium to record an information signal with a maximum frequency of not less than about 8 MHz, and wherein the magnetic material for the core is a Mn--Zn ferrite having a Curie temperature of not less than 140.degree. C., a permeability of not less than 200 at frequency 8 MHz at temperature 25.degree. C., and an effective saturation magnetic flux density B.sub.10 of not less than 4400 G.

A magneto-optical recording apparatus comprising:

• an optical head for irradiating a magneto-optical recording medium with a light spot;
• and
• a magnetic head for applying a magnetic field to the magneto-optical recording medium, said magnetic head comprising a slider sliding on the magneto-optical recording medium, a core made of a magnetic material and mounted to said slider, and a coil wound around said core, wherein upon application of a voltage to said coil a modulation magnetic field is applied to a recording surface of the magneto-optical recording medium to record an information signal with a maximum frequency of not less than about 10 MHz, and wherein the magnetic material for the core is a Mn--Zn ferrite having a Curie temperature of not less than 170.degree. C., a permeability of not less than 200 at frequency 10 MHz at temperature 25.degree. C., and an effective saturation magnetic flux density B.sub.10 of not less than 5000 G.

A magneto-optical recording apparatus comprising:

• an optical head for irradiating a magneto-optical recording medium with a light spot;
• and
• a magnetic head for applying a magnetic field to the magneto-optical recording medium, said magnetic head comprising a slider sliding on the magneto-optical recording medium, a core made of a magnetic material and mounted to said slider, and a coil wound around said core, wherein upon application of a voltage to said coil a modulation magnetic field is applied to a recording surface of the magneto-optical recording medium to record an information signal with a maximum frequency of not less than about 12 MHz, and wherein the magnetic material for the core is a Mn--Zn ferrite having a Curie temperature of not less than 200.degree. C., a permeability of not less than 200 at frequency 12 MHz at temperature 25.degree. C., and an effective saturation magnetic flux density B.sub.10 of not less than 5500 G.