Composite magnetic powder, method for producing the same and recording medium containing the same
US4957812A · kind A · utility
20Cited by
5References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1987 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Oct 13, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/257
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a composite magnetic powder comprising two crystal phases of a hexagonal ferrite portion and a spinel structure ferrite portion, which are different in thermal characteristic and in crystal structure and which are in a crystallographically epitaxial relation in each particle. The magnetic powder can be synthesized by reaction of starting components in a low temperature solution. Using the magnetic powder, a vertical magnetic recording medium can be provided, which is excellent in weather stability and suitable for short wavelength recording.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.