Near field transducer with high refractive index pin for heat assisted magnetic recording
US8971160B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2014 |
| Grant date | Mar 3, 2015 |
| Priority date | — |
| Expiry date | Mar 27, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An HAMR NFT pin and main body structure comprising a pin material with high index of refraction and low absorption coefficient is disclosed. The disclosed NFT pin provides a comparable media absorption efficiency to the conventional Au pin while improving on overall NFT reliability. The protrusion of the NFT pin is reduced and overall life of the writer is prolonged. The main body may comprise any noble metal or metal alloy suitable for achieving optical resonance in an HAMR NFT. The cladding material may be selected such that its coefficient of thermal expansion closely matches the coefficient of thermal expansion of the pin material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.