Magnetic recording head and magnetic recording device

A magnetic recording head, comprising:

• a light source for emitting a laser beam;
• and
• a magnet coil for use in magnetic recording,
• wherein said magnet coil is integrally provided with said light source and wherein a main magnetic pole of said magnetic coil is disposed at a center of a laser aperture serving as a laser emitting surface of said light source, wherein:
• said laser aperture has a radius R within the range of:
• λ/2+aλ≦R≦1.3λ+aλ (λ is a wavelength of the laser beam, and a is 0 or a positive integer (a>≠0)), said magnetic recording head further comprising:
• a shielding member for shielding only a laser beam, which passes through a predetermined area at a center of said laser aperture, of all laser beams which pass through said laser aperture.

A magnetic recording head, comprising:

• a light source for emitting a laser beam;
• a magnet coil for use in magnetic recording,
• wherein said magnet coil is integrally provided with said light source around a center of a laser aperture serving as a laser emitting surface of said light source,
• wherein said laser aperture has a radius R within the range of:
• λ/2+aλ≦R≦1.3λ+aλ (λ is a wavelength of the laser beam, and a is 0 or a positive integer (a≧0));
• and
• a shielding member for shielding only a laser beam, which passes through a predetermined area at a center of said laser aperture, of all laser beams which pass through said laser aperture, wherein said shielding member is made of soft magnetic metal.

A magnetic recording head, comprising:

• a light source for emitting a laser beam;
• and
• a magnet coil for use in magnetic recording,
• wherein said magnet coil is integrally provided with said light source and wherein a main magnetic pole of said magnetic coil is disposed at a center of a laser aperture serving as a laser emitting surface of said light source, wherein:
• said light source is composed of a surface-emitting semiconductor laser.

A magnetic recording head, comprising:

• a magnet coil;
• a light source for emitting a laser beam having a wavelength λ, which is provided at a center of said magnet coil, and is composed of a surface-emitting semiconductor laser layer having a center, wherein a laser aperture serving as a laser emitting surface has a radius R within the range of:
• λ/2+aλ≦R≦1.3λ+aλ (a is 0 or a positive integer (a≧0));
• and
• a shielding member provided at a center of the laser emitting surface of said light source, wherein the shielding member comprises a main magnetic pole that is disposed said center of the surface-emitting semiconductor laser layer.

A magnetic recording device, comprising:

• light emitting means which includes a) a light source for emitting a laser beam having a wavelength λ, wherein a laser aperture serving as a laser emitting surface has a radius R within the range of λ/2+aλ≦R≦1.3λ+aλ (a is 0 or a positive integer (a≧0)), and b) a shielding member for shielding only a laser beam, which passes through a predetermined area at a center of said laser aperture, of all laser beams which pass through said laser aperture, wherein the shielding member comprises a main magnetic pole that is disposed at a center of a surface-emitting semiconductor laser layer;
• and
• a magnet coil for applying a magnetic field onto a magnetic recording medium,
• wherein said light emitting means forms a light spot by focusing the laser beam onto the magnetic recording medium using said shielding member;
• and
• said magnet coil applies the magnetic field for use in magnetic recording in an area including a light spot forming region of the magnetic recording medium.

A magnetic recording device, comprising:

• light emitting means which includes a) a light source for emitting a laser beam having a wavelength λ, wherein a laser aperture serving as a laser emitting surface has a radius R within the range of λ/2+aλ≦R≦1.3λ+aλ (a is 0 or a positive integer (a≧0)), and b) a shielding member for shielding only a laser beam, which passes through a predetermined area at a center of said laser aperture, of all laser beams which pass through said laser aperture;
• and
• a magnet coil for applying a magnetic field onto a magnetic recording medium,
• wherein said light emitting means forms a light spot by focusing the laser beam onto the magnetic recording medium using said shielding member;
• said magnet coil applies the magnetic field for use in magnetic recording in an area including a light spot forming region of the magnetic recording medium;
• and wherein said shielding member is made of soft magnetic metal.

A magnetic recording device, comprising:

• a magnet coil for applying a magnetic field onto a magnetic recording medium;
• a light source, which is provided at a center of said magnet coil and is composed of a surface-emitting semiconductor laser layer, for emitting a laser beam having a wavelength λ, wherein a laser aperture serving as a laser emitting surface has a radius R within the range of:
• λ/2+aλ≦R≦1.3λ+aλ (a is 0 or a positive integer (a≧0)) so as to form a light spot of the laser beam in a magnetic field application area of the magnetic recording medium by said magnet coil;
• and
• a shielding member provided at a center of the laser emitting surface of said light source, wherein the shielding member comprises a main magnetic pole disposed at a center of the surface-emitting semiconductor laser layer.

A magnetic recording head, comprising:

• a light source for emitting a laser beam;
• and
• a magnet coil for use in magnetic recording,
• wherein said magnet coil is integrally provided with said light source and wherein a main magnetic pole of said magnetic coil is disposed at a center of a laser aperture serving as a laser emitting surface of said light source, wherein a magnetic sensor and an optical servo system are provided in one integral part.