High speed magnetic coil for magneto-optical head

A magnetic head having a coil facing parallel a magneto-optical recording medium, wherein the coil has a conductor pattern made of a conductive material film, and the conductor pattern includes a spiral coil pattern to which a current can be supplied to flow around a magnetic filed generation center, and a conductor pattern which is formed outside the coil pattern and cannot receive at least a current so as to flow around the magnetic filed generation center, where S is a distance from an outer edge of an outermost periphery of the coil pattern, and P is a pitch (or minimum value when the pitch is not constant) of the coil pattern, a conductor occupation ratio (ratio of a total area of all conductor patterns formed in a given region to a total area of the region) R of a conductor pattern formed outside the coil pattern simultaneously satisfy inequalities 1, 2 and 3, and the conductor pattern does not form any closed loop surrounding the coil pattern in a first region A1 given by inequality 1:

• Inequality 1:
• 0≦R≦0.3 in the first region A1 where
• 0≦S≦1.5P
• Inequality 2:
• 0≦R≦0.8 in a second region A2 where
• 1.5P<S≦6.0P
• Inequality 3:
• 0.3<R≦1 in a third region A3 where
• 6.0P<S.

A magneto-optical recording apparatus having an optical head for irradiating a magneto-optical recording medium with light and a magnetic head for applying a magnetic field modulated by an information signal to the magneto-optical recording medium, wherein the magnetic head has a coil facing parallel the magneto-optical recording medium and a conductor pattern made of a conductive material film, and the conductor pattern includes a spiral coil pattern to which a current can be supplied to flow around a magnetic field generation center, and a conductor pattern which is formed outside the coil pattern and cannot receive at least a current so as to flow around the magnetic field generation center, where S is a distance from an outer edge of an outermost periphery of the coil pattern, and P is a pitch (or minimum value when the pitch is not constant) of the coil pattern, a conductor occupation ratio (ratio of a total area of all conductor patterns formed in a given region to a total area of the region) R of a conductor pattern formed outside the coil pattern simultaneously satisfy inequalities 1, 2 and 3, and the conductor pattern does not form any closed loop surrounding the coil pattern in a first region A1 given by inequality 1:

• Inequality 1:
• 0≦R≦0.3 in the first region A1 where
• 0≦S≦1.5P
• Inequality 2:
• 0≦R≦0.8 in a second region A2 where
• 1.5P<S≦6.0P
• Inequality 3:
• 0.3<R≦1 in a third region A3 where
• 6.0P<S.