Heat-assisted recording head having sub wavelength mirror formed of first and second materials
AssigneeSeagate Technology LLC
InventorsWeibin Chen, Nan Zhou, Ruoxi Yang, Michael Allen Seigler
Life of this patent
Estimating the term…
Abstract
A recording head has a near-field transducer proximate a media-facing surface of the recording head. The near-field transducer extends a first distance away from the media-facing surface. A waveguide overlaps and delivers light to the near-field transducer. Two subwavelength focusing mirrors are at an end of the waveguide proximate the media-facing surface. The subwavelength mirrors are on opposite crosstrack sides of the near-field transducer and separated from each other by a crosstrack gap. The subwavelength focusing mirrors each include a first material at the media-facing surface and a liner that covers an edge of the mirror.
Claims20
A recording head comprising:
- a near-field transducer proximate a media-facing surface of the recording head, the near-field transducer extending a first distance away from the media-facing surface;
- a waveguide that overlaps and delivers light to the near-field transducer;
- and
- a pair of subwavelength focusing mirrors at an end of the waveguide proximate the media-facing surface and extending a second distance away from the media-facing surface that is less than the first distance, the subwavelength mirrors on opposite crosstrack sides of the near-field transducer and separated from each other by a crosstrack gap, the subwavelength focusing mirrors each comprising:
- a first material at the media-facing surface;
- and
- a liner that covers an edge of the subwavelength focusing mirror that faces the near-field transducer, the liner formed of a plasmonic material, the first material more mechanically robust than the plasmonic material.
A recording head comprising:
- a near-field transducer proximate a media-facing surface of the recording head;
- a waveguide that overlaps and delivers light to the near-field transducer;
- and
- a pair of subwavelength focusing mirrors at an end of the waveguide proximate the media-facing, surface, the subwavelength mirrors on opposite crosstrack sides of the near-field transducer and separated from each other by a crosstrack gap, the subwavelength focusing mirrors each comprising:
- a first material at the media-facing surface that comprises one of Rh, Ir, Pt, Pd, Ru, or their alloys;
- and
- a liner that covers the first material at an edge of the subwavelength focusing mirror that faces the near-field transducer, the liner formed of a different material than the first material.
A recording head comprising:
- a near-field transducer proximate a media-facing surface of the recording head and having a peg extending towards the media-facing surface;
- a waveguide that overlaps and delivers light to the near-field transducer;
- and
- a pair of subwavelength focusing mirrors at an end of the waveguide proximate the media-facing surface, the subwavelength mirrors on opposite crosstrack sides of the near-field transducer and separated from each other by a crosstrack gap, the subwavelength focusing mirrors each comprising:
- a first material at the media-facing surface;
- a liner that covers the first material at an edge of the subwavelength focusing mirror that faces the near-field transducer, the comprising a plasmonic material, the first material being more mechanically robust than the plasmonic material;
- and
- a protrusion that extends into the crosstrack gap towards the peg of the near-field transducer, the protrusion having a downtrack dimension that is less than that of the subwavelength focusing mirror.
Dependencies are inferred from the claim text.