Ultra-short yoke length writer
View Patent ↗A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a main pole having a pole tip, at least one auxiliary pole and at least one coil for energizing the main pole. The auxiliary pole(s) are adjacent to the main pole in a down track direction and recessed from the ABS. The coil(s) have a plurality of turns. At least one of the turns is between the auxiliary pole(s) and the ABS.
1. A magnetic transducer having an air-bearing surface (ABS) comprising:
a main pole including a pole tip;
at least one auxiliary pole adjacent to the main pole in a down track direction and recessed from the ABS; and
at least one coil for energizing the main pole and having a plurality of turns, at least one of the plurality of turns being between the at least one auxiliary pole and the ABS, the at least one of the plurality of turns being recessed from the ABS such that the ABS is free of structures having a current driven therethrough;
wherein the plurality of turns includes at least one additional turn offset from the at least one of the plurality of turns in the down track direction; and
wherein the at least one of the plurality of turns has a first cross-sectional area and the at least one additional turn has a second cross-sectional area substantially equal to the first cross-sectional area.
2. The magnetic transducer of claim 1 wherein the at least one of the plurality of turns is spaced apart from the at least one auxiliary pole by at least twenty nanometers and not more than four hundred nanometers.
3. The magnetic transducer of claim 2 wherein the plurality of turns has a resistance of not more than ten ohms.
4. The magnetic transducer of claim wherein the at least the additional turn overlaps the at least one of the plurality of turns in a stripe height direction perpendicular to the ABS.
5. The magnetic transducer of claim wherein the at least one of the plurality of turns includes a single turn.
6. The magnetic transducer of claim 5 wherein the plurality of turns includes three turns.
7. The magnetic transducer of claim 5 wherein the plurality of turns includes two turns.
8. The magnetic transducer of claim 1 further wherein the at least one coil is a portion of coil selected from a helical coil and a spiral coil.
9. The magnetic transducer of claim 1 wherein the main pole includes a first side and a second side opposite to the first side, wherein the plurality of turns is closer to the first side of the main pole and wherein at least one coil includes a second plurality of turns substantially equidistant from the main pole.
10. The magnetic transducer of claim 1 further comprising:
a shield having a shield pedestal between the at least one of the plurality of turns and the ABS.
11. The magnetic transducer of claim 10 wherein the shield is on a first side of the main pole in the down track direction and the auxiliary pole is on a second side of the main pole, the second side of the main pole being opposite to the first side.
12. A magnetic transducer having an air-bearing surface (ABS) comprising:
a main pole including a pole tip, a first side and a second side opposite to the first side in a down track direction;
an auxiliary pole adjacent to the main pole in the down track direction and recessed from the ABS;
a shield having a shield pedestal between the auxiliary pole and the ABS
at least one coil for energizing the main pole and having a plurality of turns, a first turn of the plurality of turns being between the auxiliary pole and the shield pedestal, at least one additional turn of the plurality of turns being offset from the first turn in the down track direction, the at least one coil forming at least one of a helical coil and a spiral coil, the first turn being recessed from the ABS such that the ABS is free of structures having a current driven therethrough;
wherein the plurality of turns includes at least one additional turn offset from the at least one of the plurality of turns in the down track direction; and
wherein the at least one of the plurality of turns has a first cross-sectional area and the at least one additional turn has a second cross-sectional area substantially equal to the first cross-sectional area.
13. A disk drive comprising:
a medium,
a slider, and
a magnetic transducer coupled with the slider, the magnetic transducer having an air-bearing surface (ABS), a main pole, at least one auxiliary pole and at least one coil for energizing the main pole, the main pole including a pole tip, the at least one auxiliary pole adjacent to the main pole in a down track direction and recessed from the ABS, and the at least one coil having a plurality of turns, at least one of the plurality of turns being between the at least one auxiliary pole and the ABS, the at least one of the plurality of turns being recessed from the ABS such that the ABS is free of structures having a current driven therethrough;
wherein the plurality of turns includes at least one additional turn offset from the at least one of the plurality of turns in the down track direction; and
wherein the at least one of the plurality of turns has a first cross-sectional area and the at least one additional turn has a second cross-sectional area substantially equal to the first cross-sectional area.
14. A method for providing a magnetic transducer having an air-bearing surface (ABS) comprising:
providing a main pole including a pole tip;
providing at least one auxiliary pole adjacent to the main pole in a down track direction and recessed from the ABS; and
providing at least one coil for energizing the main pole and having a plurality of turns, at least one of the plurality of turns being between the at least one auxiliary pole and the ABS, the at least one of the plurality of turns being recessed from the ABS such that the ABS is free of structures having a current driven therethrough;
wherein the plurality of turns includes at least one additional turn offset from the at least one of the plurality of turns in the down track direction; and
wherein the at least one of the plurality of turns has a first cross-sectional area and the at least one additional turn has a second cross-sectional area substantially equal to the first cross-sectional area.
15. The method of claim 14 wherein the at least one additional turn overlaps the at least one of the plurality of turns in a stripe height direction perpendicular to the ABS.
16. The method of claim 14 wherein the at least one of the plurality of turns includes a single turn.
17. The method of claim 14 wherein the plurality of turns includes three turns.
18. The method of claim 14 wherein the plurality of turns includes two turns.
19. The method of claim 14 further wherein the at least one coil is part of a coil selected from a helical coil and a spiral coil.
20. The method of claim 14 further comprising:
providing a shield having a shield pedestal between the at least one turn of the plurality of turns and the ABS.