Method and system for providing energy assisted magnetic recording disk drive using a distributed feedback laser
View Patent ↗A method and system for providing an energy assisted magnetic recording (EAMR) disk drive are described. The EAMR disk drive includes a media, a slider having a trailing face and an air-bearing surface (ABS), at least one distributed feedback (DFB) layer and EAMR transducer(s) on the slider. The DFB laser(s) each includes a plurality of quantum wells, a laser coupling grating, at least one reflector, and a cavity in the at least one DFB laser. The DFB laser(s) for providing energy to the media. The EAMR transducer(s) includes at least one waveguide, a write pole, at least one coil for energizing the write pole, at least one grating, and may include a near-field transducer. The grating(s) include a coupling grating for coupling the energy from the at least one DFB laser to the waveguide(s). The waveguide(s) direct the energy from the at least one grating toward the ABS.
1. A method for providing an energy assisted magnetic recording (EAMR) disk drive including a media and a slider having a trailing face and an air-bearing surface (ABS), the method comprising:
fabricating at least one EAMR transducer on the slider, the at least one EAMR transducer including at least one waveguide, a write pole, at least one coil for energizing the write pole, least one grating including a coupling grating and a first mirror; and
bonding at least one distributed feedback (DFB) laser to the slider, the at least one EAMR transducer residing between the at least one DFB laser and the slider, the at least one DFB laser including a plurality of quantum wells, a second mirror, a laser coupling grating, at least one reflector, and a cavity in the at least one DFB laser, the plurality of quantum wells residing between the second mirror and the cavity, the at least one DFB laser for providing energy to the media, the coupling grating for coupling the energy from the at least one DFB laser to the at least one waveguide, the at least one waveguide directing the energy from the coupling grating toward the ABS and residing between the first mirror and the cavity.
2. The method of claim 1 wherein at least one grating further includes a reflecting grating, the coupling grating residing between the ABS and the reflecting grating.
3. The method of claim 1 wherein the at least one reflector includes first reflecting grating between the ABS and the laser coupling grating and a second reflecting grating, the laser coupling grating residing between the second reflecting grating and the ABS.
4. The method of claim 1 wherein the laser coupling grating is a second order surface couple grating.
5. The method of claim 4 wherein the at least one reflector further includes at least one of a mirror and a reflecting grating residing between the ABS and the laser coupling grating.
6. The method of claim 1 wherein the laser coupling grating is a first surface couple grating and wherein the coupling grating is a second surface couple grating.
7. The method of claim 1 wherein the step of fabricating the at least one EAMR transducer further includes:
providing a near-field transducer (NFT) for focusing the energy from the at least one waveguide onto the media.
8. The method of claim 1 wherein the waveguide further directs reflected energy from the ABS to the coupling grating.
9. The method of claim 1 wherein the at least one DFB laser further includes an antireflective coating residing at an edge of the cavity.