Laser power sensor for thermally assisted magnetic recording
US8406090B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2008 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Jun 13, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus, system, and method for measuring thermally induced electric resistance changes in thermally assisted magnetic recording are disclosed for monitoring laser light output in thermally assisted magnetic recording disk drives. An electrical lead is coupled to a read/write head element. A first electrical resistance in the read/write head element is measured. The read/write head is heated by a laser and a second electrical resistance in the read/write head element is measured. The electrical resistance may be monitored at regular intervals when the read/write head element is on the ramp or the electrical resistance measurements may be continuously monitored as the read/write head flies over the magnetic media.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.