Uniform sense condition magnetic field sensor using differential magnetoresistance
US6462541B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Oct 8, 2002 |
| Priority date | — |
| Expiry date | Nov 12, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y25/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A ferromagnetic thin-film based sensing arrangement having a plurality of magnetic field sensors on a substrate each having an intermediate layer of a nonmagnetic material with two major surfaces on opposite sides thereof with one of a pair of magnetically permeable films each of a magnetoresistive, anisotropic ferromagnetic material correspondingly positioned thereon with first and second oriented sensors therein respectively having a selected and a reversing magnetization orientation structure provided with one of said pair of permeable films thereof for orienting its magnetization in a selected direction absent an externally applied magnetic field in at least partly opposing directions. Alternatively, these magnetizations of the films can be oriented in the same direction but with the other film member of the pair provided adjacent a coupling layer that antiferromagnetically couples thereto a further ferromagnetic layer on an opposite side thereof of a lesser thickness for one sensor and a greater thickness for the other. Such a sensing arrangement can be formed by providing a succession of material layers on a substrate with one or more coupling layers for antiferromagnetically…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.