System for providing a transducer having a main coil and an additional coil separated from the main pole by a write shield
View Patent ↗A method and system for providing a magnetic recording head is described. The magnetic recording head has an air-bearing surface (ABS) configured to reside in proximity to a media during use. The head includes a first coil, a second coil, a main pole, and a third coil. The first coil has a first plurality of turns and is configured to carry a first write current in a first direction. The second coil has a second plurality of turns and is configured to carry a second write current in a second direction. The main pole is between the first coil and the second coil. The third coil has a third plurality of turns configured to carry a third write current in a third direction.
1. A magnetic recording head having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the magnetic recording head comprising:
a main coil having a first coil portion and a second coil portion, the first coil portion having a first plurality of turns and configured to carry a first write current in a first direction
the second coil portion having a second plurality of turns and configured to carry a second write current in a second direction;
a main pole residing between the first coil portion and the second coil portion;
a third coil having a third plurality of turns configured to carry a third write current in a third direction; and
a write shield between the second coil portion and the third coil, the second coil portion being between the write shield and the main pole.
2. The magnetic recording head of claim 1 wherein the third coil is a pancake coil having the third plurality of turns proximate to the ABS and an additional plurality of turns distal from the ABS.
3. The magnetic recording head of claim 1 further comprising:
a fourth coil carrying current in the first direction, the main pole being between the second coil portion and the fourth coil.
4. The magnetic recording head of claim 1 further comprising:
a fourth coil carrying current in the second direction, the main pole being between the first coil portion and the fourth coil.
5. The magnetic recording head of claim 1 wherein the third coil is a helical coil having the third plurality of turns and an additional plurality of turns, the third plurality of turns residing between the additional plurality of turns and the main pole.
6. The magnetic recording head of claim 1 further comprising:
an additional shield, the third coil being between the additional shield and the write shield.
7. The magnetic recording head of claim 6 wherein a portion of the additional shield resides at the ABS.
8. The magnetic recording head of claim 6 wherein the additional shield has a front surface recessed from the ABS.
9. The magnetic recording head of claim 1 wherein the first coil portion and the second portion coil form a helical coil.
10. The magnetic recording head of claim 1 wherein the first coil portion is a portion of a pancake coil including a fourth plurality of turns distal from the main pole.
11. The magnetic recording head of claim 10 wherein the second coil portion is a portion of a pancake coil including a fifth plurality of turns distal from the main pole.
12. The magnetic recording head of claim 1 wherein the third plurality of turns includes a number of turns different from the second plurality of turns and the first plurality of turns.
13. The magnetic recording head of claim 1 wherein the first plurality of turns and the second plurality of turns includes an equal number of turns.
14. The magnetic recording head of claim 1 wherein the first direction is the same as the third direction and opposite to the second direction.
15. The magnetic recording head of claim 1 wherein the main pole further includes a yoke portion and has a yoke length, the yoke length being substantially perpendicular to the ABS and less than six micrometers.
16. The magnetic recording head of claim 15 wherein the yoke length is not more than 3.5 μm.
17. A magnetic recording head having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the magnetic recording head comprising:
a main coil having a first coil portion and a second coil portion, the first coil portion having a first plurality of turns and configured to carry a first write current in a first direction;
a main pole having a pole tip portion proximate to the ABS, a yoke portion distal from the ABS, and a yoke length, the yoke length being less than 6 μm;
the second coil portion having a second plurality of turns and configured to carry a second write current in a second direction opposite to the first direction, the yoke portion of the main pole residing between the first coil portion and the second coil portion;
a write shield, the second coil portion being between the write shield and the main pole; and
a third coil having a third plurality of turns and a fourth plurality of turns distal from the ABS, the third plurality of turns configured to carry a third write current in the first direction, the fourth plurality of turns carrying the third write current in the second direction, the third plurality of turns being between the ABS and the fourth plurality of turns, the write shield residing between the second coil portion and the third coil portion.
18. The magnetic recording head of claim 17 further comprising:
an additional shield, the third coil being between the additional shield and the write shield.
19. The magnetic recording head of claim 17 wherein the first coil portion and the second coil portion form a helical coil.
20. The magnetic recording head of claim 17 wherein the first coil portion is a pancake coil including a fifth plurality of turns distal from the main pole and wherein the second coil portion is a pancake coil including a sixth plurality of turns distal from the main pole.
21. A magnetic recording disk drive comprising:
a slider;
a magnetic recording head coupled with the slider and including a main coil having first coil portion and a second coil portion, a third coil, a write shield, and a main pole, the first coil portion having a first plurality of turns and configured to carry a first write current in a first direction, the second coil portion having a second plurality of turns and configured to carry a second write current in a second direction, the main pole residing between the first coil portion and the second coil portion, the third coil having a third plurality of turns configured to carry a third write current in a third direction, the write shield being between the second coil portion and the third coil, the second coil portion being between the write shield and the main pole.
22. A method for providing a magnetic recording head having an air-bearing surface (ABS) configured to reside in proximity to a media during use, the method comprising:
providing a main coil having a first coil portion and a second coil portion, the first coil portion having a first plurality of turns and configured to carry a first write current in a first direction the second coil portion having a second plurality of turns and configured to carry a second write current in a second direction;
providing a main pole residing between the first coil portion and the second coil portion;
providing a third coil having a third plurality of turns configured to carry a third write current in a third direction; and
providing a write shield between the second coil portion and the third coil portion, the second coil portion being between the write shield and the main pole.