Thermally-assisted magnetic recording method and thermally-assisted magnetic recorder
AssigneeKabushiki Kaisha Toshiba
InventorsJunichi Akiyama, Katsutaro Ichihara, Akira Kikitsu
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Abstract
In a thermally-assisted magnetic recorder configured to heat a medium with a heat source like a light beam and thereby decrease the coercive force of a recording portion so as to magnetically record information on the recording portion decreased in coercive force by applying a recording magnetic field from a recording magnetic pole thereto, relative timing between heating of the medium and magnetic recording is optimized by locating a reversing point of magnetization, in which the coercive force of the recording portion equals the intensity of the recording magnetic field, in the leading side of the trailing edge of the recording magnetic pole.
Claims20
A thermally-assisted magnetic recording method comprising;
- a step of heating a recording medium having a recording portion to decrease a coercive force of the recording portion;
- and
- a step of applying a magnetic field from a magnetic pole onto the recording portion decreased in coercive force to record information magnetically,
- wherein a reversing point of magnetization where the coercive force of the recording portion equals an intensity of the magnetic field is located in a position in a leading side of a trailing edge of the magnetic pole.
A thermally-assisted magnetic recording method comprising;
- a step of irradiating a light from a light emitting element to heat a recording medium having a recording portion to decrease a coercive force of the recording portion;
- and
- a step of applying a magnetic field from a magnetic pole onto the recording portion decreased in coercive force to record information magnetically,
- wherein before the recording portion heated by the light emitting element passes through the magnetic field applied by the magnetic pole, the coercive force of the recording portion becomes smaller than the magnetic field, and a relation of Dth≦4L is satisfied, where Dth is a distance from a trailing edge of an emitting portion of the light emitting element to a leading edge of the magnetic pole, and L is a distance from the leading edge to the trailing edge of the emitting portion.
A thermally-assisted magnetic recorder comprising:
- a heat source configured to heat a recording portion of a recording medium;
- and
- a magnetic pole configured to record information magnetically by applying a magnetic field to the recording portion heated by the heat source and decreased in coercive force,
- wherein a reversing point of magnetization where the coercive force of the recording portion equals an intensity of the magnetic field is located in a position in a leading side of a trailing edge of the magnetic pole.
A thermally-assisted magnetic recorder comprising:
- a light emitting element as a heat source configured to heat a recording portion of a recording medium;
- and
- a magnetic pole, located in a position in the trailing side of the light emitting element, configured to record magnetic information on the recording portion of the recording medium heated by the light emitting element by applying a magnetic field,
- wherein before said recording portion heated by the heat source passes through the magnetic field applied by the magnetic pole, a coercive force of the recording portion becomes smaller than the magnetic field, and a relation of Dth≦4L is satisfied, where Dth is a distance from a trailing edge of an emitting portion of the light emitting element to a leading edge of the magnetic pole, and L is a distance from the leading edge to the trailing edge of the emitting portion.
Dependencies are inferred from the claim text.