Perpendicular magnetic recording medium and method of producing

Details Perpendicular magnetic recording medium and method of producing Perpendicular magnetic recording medium and method of producing

1993-11-18

1997-08-26

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 428694MT, 428694RE, 428694XS, 428694T, 428900, 428928, 427128, 427129, 427130, 427131, 427132, 365122, 360131, 360135, 369288, G11B 566, B32B 3300

Patent

active

056609299

ABSTRACT:
A perpendicular magnetic recording medium is fabricated based on R.sub.21-60 (Fe.sub.1-y Co.sub.y).sub.z M.sub.0-10 wherein z is balance and at least 70 at % of R is Nd and/or Pr, the balance of R being one or more of other rare earth elements, and wherein y is less than 0.5 by atomic ratio. M is at least one of various additional metal elements. The Curie temperature Tc is between 70.degree. to 250.degree. C.; the saturation magnetization Ms is about 450 emu/cc or more; the uniaxial perpendicular magnetic anisotropy constant Ku of 2.5.times.10.sup.6 erg/cc or more is attained. Kerr rotation angle is 0.3 degree or more, which provides a magneto-optic recording medium. Since light rare earth elements having the collinear alignment of magnetic moment with Fe are used as a key element, it is possible to fabricate uniform perpendicular magnetic anisotropy thin films in a mass production scale at a low cost.

REFERENCES:
patent: 4367257 (1983-01-01), Arai et al.
patent: 4544443 (1985-10-01), Ohta et al.
patent: 4666759 (1987-05-01), Ohkawa et al.
Journal de Physique, Sep. 1985, Carey et al., "Sputtered NdFe Films With Perpendicular Anisotropy", pp. C6-111 -C-115.
Journal of Materials Science Letters vol. 4, 1985, Carey et al., "Fine-particle NdFe Films with High Coercivity and Perpendicular Anisotropy," pp. 1302-1304.
R.J. Gambino et al., J. Appl. Phys. 57(1), 15 Apr. 1985 Magneto-optic properties of Nd-Fe-Co. amorphous alloys.
Katayama et al., "Annealing Effects on Magnetic Properties of Amorphous GdCo, GdFe, and Gd Co Mo Films", J. appl. Phys 49(3) Mar. 1978 p. 1759.
Taylor et al., J appl. Phys. 45(5) May 1978 p. 2885.
Gambino et al. "Magneto-Optic Properties of Nd-Fe-Co Amorphous Alloys" J. appl. Phys 57(1) 15 Apr. 1985, pp. 3906-3908.

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