Magneto resistive sensor
US6692847B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2001 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Feb 22, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1129
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A magneto resistive sensor having a GMR magnetic laminated film is disclosed. The GMR magnetic laminated film comprises a plurality of magnetic thin layers having a NiCoFeB composition alternately laminated with a nonmagnetic thin layer, such as copper layer. Since the magnetic thin layer contains B in its composition, the GMR magnetic laminated film can stand in magneto resistance ratio (&Dgr;R/R %) under a high temperature of up to 250 degrees centigrade. By the reason, electric wiring can be connected by a lead-free solder to assemble a magnetic resistive sensor for a magnetic rotary encoder. The thermal resistance variation and the magneto resistance ratio are further improved when a NiFeCr underlayer is used under the GMR magnetic laminated film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.