Sensor of weak magnetic fields, with magnetoresistive effect
US5313186A · kind A · utility
60Cited by
1References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 16, 1992 |
| Grant date | May 17, 1994 |
| Priority date | — |
| Expiry date | Dec 16, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y25/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor of weak magnetic fields with magnetoresistive effect features a metallic multilayer formed by alternating magnetic and non-magnetic metals. In order to detect weak fields, a sensor is described wherein a magnetic field is coupled by an anti-ferromagnetic type coupling with a first neighboring magnetic layer and by a ferromagnetic type coupling with a third neighboring magnetic layer, so that there is frustration of coupling. The first and third magnetic layers are blocked by their strong coercive field. The sensor finds particular application to detection on magnetic media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.