1. An energy assisted magnetic recording (EAMR) transducer 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 transducer comprising:
a write pole configured to write to a region of the media;
at least one coil for energizing the write pole;
a near field transducer (NFT) proximate to the ABS and for focusing the energy onto the region of the media;
a waveguide configured to direct the energy from the laser toward the NFT at an incident angle with respect to the ABS, a first portion of the energy reflecting off of the ABS at a reflected angle; and
a reflective grating configured to receive the first portion of the energy at the reflected angle from the ABS and to reflect a second portion of the energy toward the ABS, the NFT residing between at least a portion of the waveguide and the reflective grating.
2. The EAMR transducer of claim 1 wherein the reflective grating is a first order grating.
3. The EAMR transducer of claim 1 wherein the energy has an effective wavelength in the reflective grating and wherein the reflective grating has a pitch substantially equal to half the effective wavelength.
4. The EAMR transducer of claim 3 wherein the reflective grating includes a first cladding, a core, and a second cladding, an interface between the core and the second cladding having the pitch.
5. The EAMR transducer of claim 4 wherein the pitch has a tolerance of substantially two percent.
6. The EAMR transducer of claim 4 wherein the reflective grating has a duty cycle of substantially fifty percent.
7. The EAMR transducer of claim 1 wherein the incident angle is not more than a critical angle, the critical angle being such that the energy undergoes total internal reflection at the ABS.
8. The EAMR transducer of claim 1 wherein the reflective grating has a bandwidth of at least thirty nanometers.
9. The EAMR transducer of claim 1 wherein the incident angle is substantially the same as the reflected angle.
10. An energy assisted magnetic recording (EAMR) transducer 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 transducer comprising:
a write pole configured to write to a region of the media;
at least one coil for energizing the write pole;
a near field transducer (NFT) proximate to the ABS and for focusing the energy onto the region of the media;
a waveguide configured to direct the energy from the laser toward the NFT at an incident angle with respect to the ABS, a first portion of the energy reflecting off of the ABS at a reflected angle; and
a first order reflective grating configured to receive the first portion of the energy at the reflected angle from the ABS and to reflect a second portion of the energy toward the ABS, the NFT residing between at least a portion of the waveguide and the first order reflective grating, the energy having an effective wavelength in the reflective grating, the first order reflective grating including a bottom cladding, a core, and a top cladding, an interface between the core and the top cladding having a pitch, the pitch substantially equal to half the effective wavelength, the pitch having a tolerance of substantially two percent and a duty cycle of substantially fifty percent, the first order reflective grating having a bandwidth of at least thirty nanometers.
11. An energy assisted magnetic recording (EAMR) disk drive comprising:
a media for storing data;
a slider having an air-bearing surface (ABS) configured to reside in proximity to the media during use;
a laser coupled with the slider for providing energy;
an EAMR transducer coupled with the slider and including a write pole, at least one coil, a near field transducer (NFT), a waveguide, and a reflective grating, the write pole configured to write to a region of the media, the at least one coil for energizing the write pole, the NFT being proximate to the ABS and for focusing the energy onto the region of the media, the waveguide configured to direct the energy from the laser toward the NFT at an incident angle with respect to the ABS, a first portion of the energy reflecting off of the ABS at a reflected angle, the reflective grating configured to receive the first portion of the energy at the reflected angle from the ABS and to reflect a second portion of the energy toward the ABS, the NFT residing between at least a portion of the waveguide and the reflective grating.
12. The EAMR disk drive of claim 11 wherein the reflective grating is a first order grating.
13. The EAMR disk drive of claim 11 wherein the energy has an effective wavelength in the reflective grating and wherein the reflective grating has a pitch substantially equal to half the effective wavelength.
14. The EAMR disk drive of claim 13 wherein the reflective grating includes a first cladding, a core, and a second cladding, an interface between the core and the second cladding having the pitch.
15. The EAMR disk drive of claim 14 wherein the pitch has a tolerance of substantially two percent.
16. The EAMR disk drive of claim 14 wherein the reflective grating has a duty cycle of substantially fifty percent.
17. The EAMR disk drive of claim 11 wherein the incident angle is not more than a critical angle, the critical angle being such that the energy undergoes total internal reflection at the ABS.
18. The EAMR disk drive of claim 11 wherein the reflective grating has a bandwidth of at least thirty nanometers.
19. The EAMR disk drive of claim 11 wherein the incident angle is substantially the same as the reflected angle.
20. A method for providing an energy assisted magnetic recording (EAMR) transducer 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 transducer comprising:
providing a write pole configured to write to a region of the media;
providing at least one coil for energizing the write pole;
providing a near field transducer (NFT) proximate to the ABS and for focusing the energy onto the region of the media;
providing a waveguide configured to direct the energy from the laser toward the NFT at an incident angle with respect to the ABS, a first portion of the energy reflecting off of the ABS at a reflected angle; and
providing a reflective grating configured to receive the first portion of the energy at the reflected angle from the ABS and to reflect a second portion of the energy toward the ABS, the NFT residing between at least a portion of the waveguide and the reflective grating.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An indexable turning insert, comprising: an upperside and an underside between which three side surfaces extend that are situated in a first imaginary, equilateral triangle and therefore converge in pairs at an angle of 60\xb0 toward corners in which cutting edges are included, wherein the underside includes three elongate and straight engagement members, each defined by a groove having a pair of opposite diverging flanks, and located in a second imaginary triangle having an equilateral shape, which is smaller than the first imaginary triangle and rotated in relation to the first imaginary triangle, one of the three engagement members being the only active engagement member included in the underside of the turning insert.
2. The turning insert according to claim 1, wherein the flanks are plane.
3. The turning insert according to claim 1, wherein a longitudinal axis of the active engagement member intersects an active side surface that is opposite an active cutting edge at an acute angle (\u03b1) within the range of 50\xb0-90\xb0.
4. The turning insert according to claim 1, wherein the legs of the second triangle have a length that is at least 60% and at most 80% of the leg length of the first triangle.
5. The turning insert according to claim 1, wherein an individual side surface of the turning insert has a length that is at most 50% of the length of a leg of the first triangle.
6. The turning insert according to claim 1, the insert being a thread-chasing insert having teeth situated in corners and on which cutting edges are formed, wherein a bisector between two flank edges of an individual tooth extends at an acute angle (\u03b2) within the range of 0-45\xb0 to a bisector between two side surfaces of the insert.