Differential magnetoresistive sensor for vertical recording
US4589041A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1982 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | Aug 30, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/1278
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An MR sensor is disclosed in which a pair of thin film magnetoresistive strips are connected electrically in parallel between two terminals. Strips are spaced apart a distance which is small relative to the density of the stored data to be sensed. The strips are mutually-biased in opposite directions to corresponding points in the linear region of their respective curves by current from a constant source attached to one terminal. Since the resistance of each strip is equal, the current divides equally between the strips. The sensor is positioned adjacent the magnetic surface containing stored data. Vertical components of the magnetic field (preferably vertically recorded data) influence the resistance of the strips differentially. When the sensor encounters a vertical flux transition, the output voltage varies to produce a unimodal type pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.