Apparatus for detecting a magnetic field using a giant magnetoresistance effect multilayer and method for preventing an output reduction of the multilayer
US5798896A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1997 |
| Grant date | Aug 25, 1998 |
| Priority date | — |
| Expiry date | May 6, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/3996
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
For preventing output drop with time of a MR magnetic head or similar apparatus including a magnetic field sensor in the form of a giant magnetoresistive element of the induced ferrimagnetic or spin-valve type in which antiparallelism of magnetization is induced between the magnetic layers by external magnetization, a magnetic field detecting apparatus comprising a magnetic field sensor using a giant magnetoresistive multilayer film of the induced ferrimagnetic type or the like includes a magnetic field generating means such as a permanent magnet. The magnetic field sensor is moved to the proximity of the magnetic field generating means and placed within the magnetic field when the magnetic field sensor is out of use or its detection sensitivity drops.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.