Barberpole MR sensor having interleaved permanent magnet and magnetoresistive segments
US5737156A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 20, 1996 |
| Grant date | Apr 7, 1998 |
| Priority date | — |
| Expiry date | Jun 20, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/4893
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A barberpole magnetoresistive (MR) sensor has a series of permanent magnet strips interleaved with a series of magnetoresistive strips. Conductive barberpole strips are canted across the sensor and connect one magnetoresistive strip, over a permanent magnet strip, to another magnetoresistive strip. The permanent magnet strips help to provide a uniform magnetic field throughout the sensor, thereby making the sensor more immune to harm from an external magnetic field and more likely to reset into a single magnetic domain oriented as desired if an external magnetic field should cause the sensor to fracture into multiple magnetic domains.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.