Method and system for providing separate write and optical modules in an energy assisted magnetic recording disk drive
View Patent ↗An energy assisted magnetic recording (EAMR) transducer coupled with a laser is described. The EAMR transducer has an air-bearing surface (ABS) residing near a media during use. The EAMR transducer includes optical and writer modules. The optical module includes a waveguide and a near field transducer (NFT). The waveguide directs the energy from the laser toward the ABS. The NFT focuses the energy onto the media. The optical and writer modules are physically separate such that no portion of the waveguide is interleaved with a magnetic portion of the writer module. The writer module includes a write pole and coil(s). The write pole includes a pole-tip portion for providing a magnetic field to the media and a yoke. The pole-tip portion has an ABS-facing surface, a sloped surface, and a NFT-facing surface therebetween. The sloped surface is at least twenty-five and not more than sixty-five degrees from the NFT-facing surface.
1. An energy assisted magnetic recording (EAMR) head coupled with a laser for providing energy and having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the EAMR head comprising:
an optical module including a waveguide and a near field transducer (NFT) proximate to the ABS, the waveguide for directing the energy from the laser toward the ABS, the NFT being optically coupled with the waveguide and for focusing the energy onto the media; and
a writer module including a write pole and at least one coil, the optical module and the writer module being physically separate such that no portion of the waveguide is interleaved with a magnetic portion of the writer module, a write pole including a pole-tip portion for providing a magnetic field to the media and a yoke coupled to the pole-tip portion, the pole-tip portion including an ABS-facing surface, a sloped surface, and a NFT-facing surface between the ABS-facing surface and the sloped surface, the sloped surface being sloped at an angle of at least twenty-five degrees and not more than sixty-five degrees with respect to the NFT-facing surface.
2. The EAMR head of claim 1 further comprising:
a reader module including a read sensor, the optical module, the reader module, and the writer module being physically separate such that no portion of the waveguide is interleaved with the reader module.
3. The EAMR head of claim 2 wherein the optical module resides between the reader module and the writer module.
4. The EAMR head of claim 1 wherein the angle is at least forty degrees and not more than fifty degrees.
5. The EAMR head of claim 1 wherein the NFT-facing surface is substantially parallel to the NFT.
6. The EAMR head of claim 5 wherein the NFT-facing surface extends not more than two hundred nanometers from the ABS.
7. The EAMR head of claim 6 wherein the NFT-facing surface extends at least twenty nanometers from the ABS.
8. The EAMR head of claim 5 wherein the NFT-facing surface extends not more than one hundred nanometers from the ABS.
9. The EAMR head of claim 1 wherein the write pole includes a nose and a flared region, the nose meeting the flared region at a flare point, the pole-tip portion including at least the nose region, the NFT facing surface meeting the sloped surface at a throat height, the throat height being the same as the flare point.
10. The EAMR head of claim 1 wherein the write pole includes a nose and a flared region, the nose meeting the flared region at a flare point, the flare point being at least twenty and not more than two hundred nanometers from the ABS.
11. The EAMR head of claim 1 wherein the waveguide is at least one of a tapered waveguide and a planar solid immersion mirror.
12. The EAMR head of claim 1 wherein the waveguide directs the energy in a direction substantially perpendicular to the ABS.
13. The EAMR head of claim 1 wherein the pole-tip portion includes a plurality of moments.
14. The EAMR head of claim 13 wherein the pole-tip portion includes a plurality of layers, each of the plurality of layers having a moment of the plurality of moments, a first layer being disposed at a leading edge of the write pole, the first layer including the NFT-facing surface and the sloped surface, the first layer having a highest moment of the plurality of moments.
15. The EAMR head of claim 14 wherein the pole-tip portion includes an opposing surface opposite to and wider than the NFT-facing surface.
16. The EAMR head of claim 1 wherein the media includes:
a magnetic layer;
a heat sink layer; and
a soft magnetic underlayer, the heat sink layer residing between the magnetic layer and the heat sink layer.
17. An energy assisted magnetic recording (EAMR) head coupled with a laser for providing energy and having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the EAMR head comprising:
a reader module including a read sensor;
an optical module including a waveguide and a near field transducer (NFT) proximate to the ABS, the waveguide for directing the energy from the laser toward the ABS, the NFT being optically coupled with the waveguide and for focusing the energy onto the media; and
a writer module including a write pole and at least one coil, the optical module, the reader module, and the writer module being physically separate such that no portion of the waveguide is interleaved with the writer module and such that such that no portion of the waveguide is interleaved with the reader module, a write pole including a pole-tip portion for providing a magnetic field to the media and a yoke coupled to the pole-tip portion, the pole-tip portion including an ABS-facing surface, a sloped surface, a NFT-facing surface between the ABS-facing surface and the sloped surface, and an opposing surface opposite to the NFT-facing surface, the NFT-facing surface being substantially parallel to the NFT, the sloped surface being sloped at an angle of at least forty degrees and not more than fifty degrees with respect to the NFT-facing surface, the NFT-facing surface extending at least twenty nanometers and not more than one hundred fifty nanometers from the ABS, the pole-tip portion further includes a plurality of layers, each of the plurality of layers having a different moment that decreases with increasing distance from the NFT-facing surface, the opposing surface being wider than the NFT-facing surface.
18. An energy assisted magnetic recording (EAMR) disk drive comprising:
a media;
a slider;
a laser for providing energy;
an EAMR head coupled with the slider and receiving the energy, the EAMR head having an air-bearing surface (ABS) configured to reside in proximity to the media during use, the EAMR head including an optical module and a writer module, the optical module including a waveguide and a near field transducer (NFT) proximate to the ABS, the waveguide for directing the energy from the laser toward the ABS, the NFT being optically coupled with the waveguide and for focusing the energy onto the media, the writer module including a write pole and at least one coil, the optical module and the writer module being physically separate such that no portion of the waveguide is interleaved with a magnetic portion of the writer module, a write pole including a pole-tip portion for providing a magnetic field to the media and a yoke coupled to the pole-tip portion, the pole-tip portion including an ABS-facing surface, a sloped surface, and a NFT-facing surface between the ABS-facing surface and the sloped surface, the sloped surface being sloped at an angle of at least twenty-five degrees and not more than sixty-five degrees with respect to the NFT-facing surface.
19. The EAMR disk drive of claim 18 wherein the NFT-facing surface is substantially parallel to the NFT.
20. The EAMR disk drive of claim 18 wherein the media includes:
a magnetic layer;
a heat sink layer; and
a soft magnetic underlayer, the heat sink layer residing between the magnetic layer and the heat sink layer.
21. The EAMR disk drive of claim 18 wherein the EAMR head further includes:
a reader module including a read sensor, the optical module, the reader module, and the writer module being physically separate such that no portion of the waveguide is interleaved with the reader module.
22. The EAMR disk drive of claim 21 wherein the optical module resides between the reader module and the writer module.
23. The EAMR disk drive of claim 18 wherein the waveguide directs the energy in a direction substantially perpendicular to the ABS.
24. The EAMR disk drive of claim 18 wherein the pole-tip portion includes a plurality of moments.
25. The EAMR disk drive of claim 24 wherein the pole-tip portion includes a plurality of layers, each of the plurality of layers having a moment of the plurality of moments, a first layer being disposed at a leading edge of the write pole, the first layer including the NFT-facing surface and the sloped surface, the first layer having a highest moment of the plurality of moments.
26. The EAMR disk drive of claim 25 wherein the pole-tip portion includes a surface opposite to the NFT-facing surface and wider than the NFT-facing surface.
27. A method for providing an energy assisted magnetic recording (EAMR) head coupled with a laser for providing energy and having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the method comprising:
providing an optical module including a waveguide and a near field transducer (NFT) proximate to the ABS, the waveguide for directing the energy from the laser toward the ABS, the NFT being optically coupled with the waveguide and for focusing the energy onto the media; and
providing a writer module including a write pole and at least one coil, the optical module and the writer module being physically separate such that no portion of the waveguide is interleaved with a magnetic portion of the writer module, a write pole including a pole-tip portion for providing a magnetic field to the media and a yoke coupled to the pole-tip portion, the pole-tip portion including an ABS-facing surface, a sloped surface, and a NFT-facing surface between the ABS-facing surface and the sloped surface, the sloped surface being sloped at an angle of at least twenty-five degrees and not more than sixty-five degrees with respect to the NFT-facing surface.
28. The method of claim 27 wherein the NFT-facing surface is substantially parallel to the NFT.
29. The method of claim 27 further comprising:
providing a reader module including a read sensor, the optical module, the reader module, and the writer module being physically separate such that no portion of the waveguide is interleaved with the reader module.
30. The method of claim 29 wherein the step of providing the optical module further includes:
fabricating the optical module between the reader module and the writer module.
31. The method of claim 27 wherein the angle is at least forty degrees and not more than fifty degrees.
32. The method of claim 27 wherein the step of providing the optical module further includes:
providing the waveguide directing the energy in a direction substantially perpendicular to the ABS.
33. The method of claim 27 wherein the pole-tip portion includes a plurality of moments.
34. The method of claim 27 wherein the step of providing the writer module further includes:
providing the pole-tip portion having an opposing surface opposite to the NFT-facing surface, the opposing surface being wider than the NFT-facing surface.