Method of manufacturing ferrimagnetic material for recording, read out and erase heads utilized in magnetic layer devices
US4059664A · kind A · utility
9Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1975 |
| Grant date | Nov 22, 1977 |
| Priority date | — |
| Expiry date | Jul 2, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/265
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.