Thermally-assisted recording (TAR) head with conductive layer between the near-field transducer and the write pole
A thermally-assisted recording (TAR) head for recording data in data tracks of a TAR disk is supported on an air-bearing slider and includes the magnetic write pole, a near-field transducer (NFT), an optical waveguide that directs laser light to the NFT, and an electrically conductive layer between and in contact with the NFT and the write pole. The NFT has an output tip having a generally triangularly-shaped end at the slider's air-baring surface (ABS). The electrically conductive layer is located between the NFT and the write pole and contacts both the NFT output tip and the write pole. The electrically conductive layer has a contact edge that is generally parallel with the ABS but recessed from the NFT output tip end and a cross-track width greater than the cross-track width of the NFT output tip end.
1. A thermally-assisted recording (TAR) head for writing to a magnetic recording layer on a magnetic recording disk comprising:
an air-bearing slider having an air-bearing surface (ABS) for facing the magnetic recording layer on the disk, the ABS having an along-the-track axis and a cross-track axis orthogonal to the along-the-track axis;
a write pole on the slider and having a tip at the ABS on the along-the-track axis;
an optical waveguide on the slider having a thickness in the along-the-track axis direction and a surface oriented generally orthogonal to the along-the-track axis;
a near-field transducer (NFT) on the slider between the optical waveguide and the write pole, the NFT having a surface parallel to and spaced from said waveguide surface and an output tip having an end at the ABS, the output tip end being located on the along-the-track axis between the waveguide and the write pole tip and having a generally triangular shape with an apex facing and spaced from the write pole tip; and
an electrically conductive layer between the NFT and the write pole and contacting the NFT output tip and the write pole, the electrically conductive layer having an edge generally parallel with the ABS, said conductive layer edge being recessed from the NFT output tip end b a distance D1 greater than or equal to 30 nm and less than or equal to 110 nm and having a cross-track width greater than the cross-track width of the NFT output tip end.
2. The TAR head of claim 1 wherein the NFT consists essentially of a material selected from Au, Ag, Al, Cu, and alloys thereof.
3. The TAR head of claim 2 wherein the electrically conductive layer is formed of the same material as the NFT and is integral with the NFT.
4. The TAR head of claim 1 wherein the electrically conductive layer is formed of a ferromagnetic material.
5. The TAR head of claim 1 wherein said conductive layer is in contact with the NFT output tip to a depth D2 of the NFT output tip in the along-the-track direction, wherein D2 is less than or equal to 60 nm.
6. The TAR head of claim 1 wherein the apex of the NFT output tip end has a cross-track width between 5 and 30 nm and wherein said conductive layer edge has a cross-track width greater than 400 nm.
7. The TAR head of claim 1 wherein said conductive layer edge has a cross-track width W cle and wherein said conductive layer has a cross-track width W d greater than W cle at a region recessed from said conductive layer edge.
8. The TAR head of claim 1 further comprising heat sink material in contact with said conductive layer and said write pole.
9. A thermally-assisted recording (TAR) disk drive comprising:
the TAR head of claim 1 ;
a laser for directing light to the waveguide; and
a magnetic recording disk having a magnetic recording layer.
10. The TAR disk drive of claim 9 wherein the magnetic recording layer is patterned into generally concentric tracks containing discrete islands of magnetic material.
11. A thermally-assisted recording (TAR) head for writing to a magnetic recording layer on a magnetic recording disk comprising:
an air-bearing slider having an air-bearing surface (ABS) for facing the magnetic recording layer on the disk, the ABS having an along-the-track axis and a cross-track axis orthogonal to the along-the-track axis;
a write pole on the slider and having a tip at the ABS on the along-the-track axis;
an optical waveguide on the slider having a thickness in the along-the-track axis direction and a surface oriented generally orthogonal to the along-the-track axis;
a near-field transducer (NFT) on the slider between the optical waveguide and the write pole, the NFT having a surface parallel to and spaced from said waveguide surface and an output tip having an end at the ABS, the output tip end being located on the along-the-track axis between the waveguide and the write pole tip and having a generally triangular shape with an apex facing and spaced from the write pole tip; and
an electrically conductive layer between the NFT and the write pole and contacting the NFT output tip and the write pole, the electrically conductive layer having a contact edge generally parallel with the ABS, said conductive layer contact edge having a cross-track width greater than the cross-track width of the apex of the NFT output tip end, said conductive layer contact edge being recessed from the NFT output tip end by a distance D1 and overlapping the NFT output tip to a depth D2 in the along-the-track direction, wherein D1 is greater than or equal to 30 nm and less than or equal to 110 nm and D2 is less than or equal to 60 nm.
12. The TAR head of claim 11 wherein the NFT consists essentially of a material selected from Au, Ag, Al, Cu, and alloys thereof.
13. The TAR head of claim 12 wherein the electrically conductive layer is formed of the same material as the NFT and is integral with the NFT.
14. The TAR head of claim 11 wherein the electrically conductive layer is formed of a ferromagnetic material.
15. The TAR head of claim 11 wherein the apex of the NFT output tip end has a cross-track width between 5 and 30 nm and wherein said conductive layer edge has a cross-track width greater than 400 nm.
16. The TAR head of claim 11 wherein said conductive layer contact edge has a cross-track width W cle and wherein said conductive layer has a cross-track width W cl greater than W cle at a region recessed from said conductive layer contact edge.
17. The TAR head of claim 11 further comprising heat sink material in contact with said conductive layer and said write pole.
18. A thermally-assisted recording (TAR) head for writing to a magnetic recording layer on a magnetic recording disk comprising:
an air-bearing slider having an air-bearing surface (ABS) for facing the magnetic recording layer on the disk, the ABS having an along-the-track axis and a cross-track axis orthogonal to the along-the-track axis;
a write pole on the slider and having a tip at the ABS on the along-the-track axis;
an optical waveguide on the slider having a thickness in the along-the-track axis direction and a surface oriented generally orthogonal to the along-the-track axis;
a near-field transducer (NFT) on the slider between the optical waveguide and the write pole, the NFT having a surface parallel to and spaced from said waveguide surface and an output tip having an end at the ABS, the output tip end being located on the along-the-track axis between the waveguide and the write pole tip and having a generally triangular shape with an apex facing and spaced from the write pole tip; and
an electrically conductive layer between the NFT and the write pole and contacting the NFT output tip and the write pole, the electrically conductive layer having an edge generally parallel with the ABS, said conductive layer edge being recessed from the NFT output tip end and having a cross-track width greater than the cross-track width of the NFT output tip end, said conductive layer being in contact with the NFT output tip to a depth D2 of the NFT output tip in the along-the-track direction, wherein D2 is less than or equal to 60 nm.