Magnetic block with adjustable magnetization for producing a permanent magnetic field in a zone of interest
US4990879A · kind A · utility
4Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1989 |
| Grant date | Feb 5, 1991 |
| Priority date | — |
| Expiry date | Apr 14, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/383
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Demagnetization effects in any magnetic block are avoided by using a mixed magnetic material comprising a predetermined proportion of permanently magnetizable magnetic material and of non-magnetic material. The proportion is adjusted as a function of the ratio between the demagnetizing excitation and a so-called cut-off excitation of the material, for which the magnetization of the material drops considerably. Application to imaging by nuclear magnetic resonance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.