Measuring transition shifts due to laser power variation in a heat-assisted magnetic recording device
US9620163B1 · kind B1 · utility
13Cited by
7References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 16, 2016 |
| Grant date | Apr 11, 2017 |
| Priority date | — |
| Expiry date | May 16, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method comprises writing a waveform on a magnetic recording medium using a heat-assisted magnetic recording apparatus which includes a laser. The method also comprises reading back the waveform from the medium, and detecting one or more transition shifts in the readback waveform indicative of a mode hop of the laser. The method further comprises measuring a metric of the one or more transition shifts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.