Thermomagnetically patterned magnets and method of making same
US5283130A · kind A · utility
21Cited by
2References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1991 |
| Grant date | Feb 1, 1994 |
| Priority date | — |
| Expiry date | Nov 6, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31993
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A permanent magnet is heated in a pattern by a laser beam to a localized temperature above the Curie point or a temperature sufficient to reduce the magnet coercivity sufficiently for the field of the magnet or an external field to remagnetize the pattern in the reverse direction. Magnets so produced can have very high pole density, digital encoding and analog patterns having gradually varying local field strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.