Method and system for reducing undesirable reflections in a HAMR write apparatus

US9484051B1 · kind B1 · utility

Assignees

• THE PROVOST, FELLOWS, FOUNDATION SCHOLARS, AND THE OTHER MEMBERS OF BOARD, OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY OF QUEEN ELIZABETH NEAR DUBLIN · IE
• Western Digital Technologies, Inc. · US

Inventors

• Alexander Krichevsky · Centereach, US
• Christopher B. Wolf · San Jose, US
• Frank Bello · Jackson, US
• Kyle Ballantine · Limerick, IE
• John F. Donegan · Kildare, IE
• David McCloskey · Ardee, IE

Key dates

• Filing date: Nov 9, 2015
• Grant date: Nov 1, 2016
• Expiry date: Nov 9, 2035

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B2005/0021
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A heat-assisted magnetic recording (HAMR) write apparatus is coupled with a laser that provides energy. The HAMR write apparatus includes a pole, at least one coil, a waveguide, a near-field transducer (NFT) and at least one antireflective mechanism. The pole writes to a region of the media and includes a media-facing surface. The coil(s) energize the pole. The waveguide is optically coupled with the laser and includes a core and cladding. The waveguide is for directing a portion of the energy toward the NFT, which is located in a transmission direction from the core of the waveguide. The antireflective mechanism(s) are in at least one of a first position in the waveguide, a second position in the NFT and a third position between the waveguide and the NFT.