Iron-oxygen based perpendicular magnetized anisotropic thin film

Details Iron-oxygen based perpendicular magnetized anisotropic thin film Iron-oxygen based perpendicular magnetized anisotropic thin film

1986-05-16

1988-08-16

Lesmes, George F.

Stock material or miscellaneous articles

Composite

Of inorganic material

252 6258, 252 6259, 428900, H01F 1000, H01F 1018

Patent

active

047644362

ABSTRACT:
A thin film according to the present invention which is disclosed herein is an iron and oxygen based perpendicular magnetized anisotropic thin film useful as a magnetic recording material. This thin film has an excellent magnetic anisotropy in the perpendicular direction to the surface thereof and comprises iron (Fe)-oxygen(O) system, and tin (Sn) and/or germanium (Ge) or aluminum (Al) as a third element. The specified examples of such thin films include those having the composition represented by (I) Fe.sub.x O.sub.y M.sub.z wherein M represents Sn and/or Ge, and (II) Fe.sub.x O.sub.y Al.sub.z.
The thin film has characteristics optimum as a uniform perpendicular magnetic recording medium, thus making it possible to provide a fine and high-density recording.

REFERENCES:
patent: 3638207 (1972-01-01), Smith et al.
patent: 3770639 (1973-11-01), Okazaki et al.
patent: 4232071 (1980-11-01), Terada et al.
patent: 4562105 (1985-12-01), Machida et al.
patent: 4586092 (1986-04-01), Martens et al.
Kobayashi et al., "Magnetic and Structural Properties of Rh Substituted Co-Cr Alloy Films with Perpendicular Magnetic Ansotropy", J. Appl. Phys. 52(3), Mar. 1981, p. 2453.
Hattori et al., "Magnetic Recording Characteristics of Sputtered .gamma.-Fe.sub.2 O.sub.3 Thin Film Disks", IEEE Trans or Mag. MAG-15, No. 6, Nov. 1979, p. 1549.

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