Head and media overcoats for heat assisted magnetic recording
US12400680B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 2024 |
| Grant date | Aug 26, 2025 |
| Priority date | — |
| Expiry date | May 1, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure generally relates to a magnetic recording drive comprising a write head disposed over a media. The write head comprises a main pole, a waveguide disposed adjacent to the main pole, a near field transducer (NFT) coupled between the main pole and the waveguide at a media facing surface (MFS) and a head overcoat disposed on the MFS, the head overcoat comprising SiN. The head overcoat has an extinction coefficient (k) value of about 0.0. The media comprises a media overcoat disposed adjacent to the head overcoat. The media overcoat comprises a first layer of C and a second layer of SiN disposed on the first layer. The media overcoat has a k-value of about 0.5 or greater. The head overcoat is transparent while the media overcoat is heat absorbent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.