MR read transducer with thermal noise cancellation
US5420736A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1994 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Apr 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Three leads L1, L2, and L3 connected to an MR stripe of an MR read transducer are arranged in a circuit for eliminating: (1) thermal asperity noise, (2) damage from shorting from the transducer to a magnetic medium, and (3) signal reduction from shorting between the conductive layers of the transducer at the ABS. The first and second leads L1 and L2 are connected to the MR stripe adjacent its top edge and the third lead L3 is connected to the MR stripe adjacent its bottom edge, the bottom edge being at the ABS of the transducer. A current of equal magnitude is applied to each of the first and second leads to flow at an angle from each of these leads to the third lead L3, this angle being preferably 45.degree. to the longitudinal axis or ABS of the MR stripe. A differential preamplifier is connected across the first and second leads L1 and L2. With this arrangement, thermal asperity noise is cancelled by common mode rejection at the differential preamplifier. The third lead L3 and the support device for a magnetic medium are grounded to prevent sensor damage from shorting between these components. The third lead also electrically interconnects the MR stripe to one of the shield laye…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.