Doped magnetic iron oxide particles and method of preparing the same
US5512317A · kind A · utility
8Cited by
5References
4Claims
0Family size
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Key dates
| Filing date | Jan 9, 1995 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Jan 9, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/70673
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A doped magnetic iron oxide particle suitable for use in magnetic recording media, and methods of preparing the doped magnetic iron oxide particle, are disclosed. The doped magnetic iron oxide particle has the general formula: EQU Co.sub.x Fe.sup.+2.sub.1-x Fe.sub.2.sup.+3 O.sub.4, wherein O<x.ltoreq.1, wherein essentially all of the cobalt(II) and iron(II) dopants are present in a shell surrounding a core of a magnetic iron oxide particle. The doped magnetic iron oxide particle has a narrow switching distribution, high squareness, high coercivity and high remanence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.