Transducer for measuring a current-generated magnetic field
US4385273A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1980 |
| Grant date | May 24, 1983 |
| Priority date | — |
| Expiry date | Sep 18, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/05
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A current-measurement transducer comprises a thin-film magnetic coil for passing an alternating premagnetizing current, generating an alternating premagnetizing field, and a magnetic-field comparator which includes first and second magnetic anisotropic films disposed in respective substantially parallel planes. Each film is composed of ferromagnetic and magnetoresistive material, and defines a magnetic easy axis, along which the film is relatively easily magnetizable, and a magnetic hard axis, at right angles to the easy axis, along which the film is harder to magnetize than along the easy magnetic axis. A non-magnetic and electrically at least poorly conducting layer separates the films, and the films are coupled to one another sufficiently tightly so that a current passing in one magnetic film generates an auxiliary magnetic field along the hard magnetic axis of the other magnetic film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.