Setting an operating bias current for a magnetoresistive head by computing a target operating voltage
US7872824B1 · kind B1 · utility
177Cited by
36References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2007 |
| Grant date | Jan 18, 2011 |
| Priority date | — |
| Expiry date | Jun 6, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A disk drive is disclosed having a disk, and a head actuated over the disk, the head comprising a magnetoresistive (MR) element. Control circuitry within the disk drive sets an operating bias current for the MR element by computing a target voltage for the MR element, applying a bias current to the MR element, measuring a voltage across the MR element corresponding to the bias current, and adjusting the bias current applied to the MR element until the measured voltage substantially equals the target voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.