Recording head with near-field antenna and composite pole
AssigneeSeagate Technology LLC
InventorsWilliam Albert Challener, Michael Allen Seigler
Life of this patent
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Abstract
A near field transducer antenna has a first end proximate a media writing surface and a second end proximate a waveguide that delivers light to the antenna. The antenna includes an aperture disposed along a propagation axis that extends from the first end to the second end. A notch protrudes within the aperture. The notch is facing an opening of the aperture that extends along the propagation axis. A magnetic pole is proximate the antenna, and includes a first portion of magnetic material and a second portion of antenna material. The second portion is disposed over the opening of the aperture and facing the notch of the antenna.
Claims19
An apparatus comprising:
- a near field transducer antenna having a first end proximate a media writing surface and a second end proximate a waveguide that delivers light to the antenna, wherein the antenna comprises:
- an aperture disposed along a propagation axis that extends from the first end to the second end;
- and
- a notch protruding within the aperture, wherein the notch is facing an opening of the aperture that extends along the propagation axis;
- a magnetic pole proximate the antenna, wherein the magnetic pole comprises a first portion of magnetic material and a second portion of non-magnetic antenna material, wherein the second portion is disposed over the opening of the aperture and facing the notch of the antenna.
An apparatus comprising:
- a waveguide having an end adjacent to an air bearing surface;
- a near-field transducer positioned adjacent to a focal point of the waveguide, wherein the near-field transducer includes an E-shaped cross sectional shape along cross sections parallel to the air bearing surface, wherein a propagation direction of the near-field transducer is normal to the air bearing surface;
- and
- a write pole magnetically proximate one side of the near-field transducer along the propagation direction, wherein the write pole includes a non-magnetic portion and a magnetic portion, wherein the non-magnetic portion covers at least part of the E-shaped cross-sectional shape of the near-field transducer along at least part of the propagation direction.
An apparatus comprising:
- means for producing a focused electric field at a media writing surface in response to local surface plasmon conditions being excited by optical energy, wherein the means for producing the focused electric field comprises an aperture disposed along a propagation axis that extends from the media writing surface to a second end, and a notch protruding within the aperture, wherein the notch face an opening of the aperture that extends along the propagation axis;
- means for generating a variable magnetic field that comprises a first portion of magnetic material and a second portion of antenna material, wherein the second portion is disposed over the opening of the aperture and facing the notch.
Dependencies are inferred from the claim text.