Method of manufacturing ferrimagnetic material for recording, re

Details Method of manufacturing ferrimagnetic material for recording, re Method of manufacturing ferrimagnetic material for recording, re

1975-07-02

1977-11-22

Cooper, Jack

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 63, 264 65, 252 6262, 423594, C04B 3530

Patent

active

040596648

ABSTRACT:
A ferrimagnetic material imparts a very high efficiency and/or sensitivity to recording read-out and erase heads cooperating with magnetic layer devices.
The starting point of the manufacturing process of this material is a solution of mineral salts or oxides of zinc, nickel and iron, and, using physicochemical processes employed in the ceramic industry, in particular sintering under pressure, spinelle structure polycrystalline ferrites are produced which satisfy the general formula: Ni.sub.1-x Zn.sub.x Fe.sub.2(1+e) O.sub.4 where x ranges between 0.5 and 0.7 and e ranges between -0.08 and +0.015.

REFERENCES:
patent: 3036007 (1962-05-01), Buykx et al.
patent: 3142645 (1964-07-01), Zerbes
patent: 3189550 (1965-06-01), Malinofsky
patent: 3472780 (1969-10-01), Stuijts

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