Magneto-resistive magnetic field sensor with a constricted region
US5936402A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1997 |
| Grant date | Aug 10, 1999 |
| Priority date | — |
| Expiry date | Jun 11, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Two magnetic layers are mutually interconnected by a constricted region also made of a magnetic material. The layers may be separated by an intermediate non-metallic layer having a hole filed with magnetic material to from the constricted region. Alternatively, the layers and constricted region may be substantially co-planar. The constricted region minimum cross-section dimension preferably is less than one micron, and ideally of the order of 100 nm, thus being much smaller than the diameter of a magnetic domain. A high magneto-resistance ratio is obtained, and electrical and magnetic properties of the sensor can be adjusted largely independently.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.