Determining thermal gradient of heat-assisted magnetic recording hotspot based on timing errors
US9837118B1 · kind B1 · utility
4Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2017 |
| Grant date | Dec 5, 2017 |
| Priority date | — |
| Expiry date | Mar 2, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Data is written to a magnetic recording medium of a drive using a read/write head. The read/write head has an energy source that applies a hotspot to the magnetic recording medium while recording. During the writing, a steady-state current applied to the energy source is changed by a step value. A timing error induced by the change in the steady-state current is measured based on reading back the data. A thermal gradient of the hotspot is determined based on the step value and the timing error.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.