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 Recording medium

Details
Inventors: Togami, Yuji;
Assignee: Nippon Hoso Kyokai (Tokyo, JP)
Primary Examiner: Pianalto; Bernard D.
Assistant Examiner:
Attorney, Agent or Firm: Stevens, Davis, Miller & Mosher

A recording medium consists of a composite amorphous magnetic material layer comprising a rare earth metal and an iron family metal, the composition ratio thereof being nonuniform in the perpendicular direction. Because of the nonuniform composition ratio, a minute magnetic domain can be formed stably, so that thermo magnetic recording at extremely high density and sensitivity can be effected. Where GdFe is employed as a suitable material, the thickness of a portion of the magnetic layer, which portion has a larger perpendicular magnetic anisotropy caused by the nonuniform composition ratio, is increased preferably in comparison with the other portion. Uniform thermo magnetic recording can be performed on the large area medium by covering the same with a transparent dielectric material layer having nonuniform thickness.

DETAILED DESCRIPTION An object of the present invention is to provide a magnetic recording medium comprising an amorphous thin layer as a recording carrier which is stable magnetically and thermally for recording a binary code signal, even if a diameter of a recorded bit is reduced to smaller than one micrometer.
Another object of the present invention is to provide a magnetic recording medium comprising an amorphous magnetic thin layer consisting mainly of arbitrarily desired kinds of rare earth metals and iron family metals, for example, of GdFe which has various industrial merits.
Still another object of the present invention is to provide a thermo magnetic recording medium which can be produced easily so as to have such a uniform recording sensitivity over the whole layer that uniform minute recorded bits can be formed by the irradiation of a laser beam having a constant intensity.
A feature of the present invention is that, in a magnetic recording medium comprising a recording carrier consisting of an amorphous magnetic thin layer which is composed mainly of rare earth metal and iron family metal, the composition ratio thereof is varied stepwise in the perpendicular direction thereto within such a range that magnetic recording can be effected.
Another feature of the present invention is that, in the above mentioned kind of magnetic recording medium which comprises plural magnetic layers provided with the magnetic anisotropy in the perpendicular direction thereot, the thickness of one of those amorphous magnetic thin layers which has a larger perpendicular magnetic anisotropy is increased in comparison with that of another layer which has a smaller perpendicular magnetic anisotropy.
Still another feature of the present invention is that, in the above mentioned kind of magnetic recording medium, the compensation for the nonuniform recording sensitivity in the thermo magnetic recording which is caused by the nonhomogeneity of the magnetic thin layer is effected by covering the magnetic thin layer with a dielectric material layer which has a thickness which is varied with response to the nonhomogeneity thereof


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