Magnetic material, magnetic recording medium, and method of manu

Details Magnetic material, magnetic recording medium, and method of manu Magnetic material, magnetic recording medium, and method of manu

1987-05-04

1990-02-27

Thibodeau, Paul J.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

252 6256, 252 6264, 428694, 428900, C04B 3526

Patent

active

049045300

ABSTRACT:
The invention relates to a magnetic material for use in the magnetic recording and playback of information, which material consists of ferrite particles having the composition A.sub.1-y Zn.sub.y Fe.sub.2 O.sub.4, wherein A is one or more bivalent metal ions, which material is suitable for use in a recording medium having a high information density in that the magnetic material comprises monodisperse ferrite particles having an average particle size between 5 and 250 nm, preferably between 10 and 50 nm, and in that y is between 0.05 and 0.35. The magnetic material preferably is Co-Zn-ferrite. The material is manufactured by coprecipitation of a mixture of hydroxides succeeded by recrystallization at elevated temperature and pressure.

REFERENCES:
patent: 3047429 (1962-07-01), Stoller et al.
patent: 4425250 (1984-01-01), Hibst
patent: 4664831 (1987-05-01), Hibst et al.
patent: 4719148 (1988-01-01), Stoppels et al.

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