Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1981-04-16
1982-08-31
Pianalto, Bernard D.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
427131, 4272552, 4272557, C23C 1500
Patent
active
043471129
ABSTRACT:
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.
REFERENCES:
patent: 3091548 (1963-05-01), Dillon
IEEE Trans. on Magnetics, vol. 1, May 11, No. 5, 9-75, Bourne et al., pp. 1332-1334.
Burilla et al., pp. 340-342, AIP Conference 1976.
S. Esho, "Anomalous Magneto-optical Hysteresis Loops of Sputtered Gd-Co Films", Proceedings of the 7th Conference on Solid State Devices, Tokyo, 1975; Supplement to Japanese Journal of Applied Physics, vol. 15, 1976.
Nippon Hoso Kyokai
Pianalto Bernard D.
LandOfFree
Method of making a recording medium does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of making a recording medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of making a recording medium will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2183402