Near-field transducer with thermal sensor and system for clocking write data in a patterned-media magnetic recording disk drive
US8514672B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2010 |
| Grant date | Aug 20, 2013 |
| Priority date | — |
| Expiry date | Jul 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A near-field transducer (NFT) has a primary tip that concentrates the oscillating charge of the NFT onto a substrate, such as magnetic recording medium, to heat regions of the medium, and a secondary tip. The secondary tip is located close to a temperature sensor, such as an electrical conductor whose resistance varies with temperature. The temperature sensor senses heat from the secondary tip and thus properties of the substrate like surface topography and the presence or absence of metallic material. The NFT can be part of a bit-patterned media (BPM) thermally-assisted recording (TAR) disk drive. The temperature sensor output is used to control the write pulses from the disk drive's write head so the magnetic write field is synchronized with the location of the magnetic data islands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.