Magnetic writer configured for high data rate recording
View Patent ↗A method and system provide a magnetic transducer having an air-bearing surface (ABS). The magnetic transducer includes a write pole and a coil. The write pole has a pole tip and a yoke. The coil energizes the write pole and includes a plurality of turns. A turn of the plurality of turns has a first portion and a second portion. The first portion has a first length in a stripe height direction substantially perpendicular to the ABS. The second portion has a second length in the stripe height direction. The second length is greater than the first length and extends at least to at least one adjacent turn.
1. A magnetic transducer having air-bearing surface (ABS) comprising:
a write pole having a pole tip and a yoke;
a coil for energizing the write pole and including a plurality of turns, a turn of the plurality of turns having a first portion and a second portion, the first portion having a first length in a stripe height direction substantially perpendicular to the ABS, the second portion having a second length in the stripe height direction, the second length being greater than the first length and extending to at least one adjacent turn of the plurality of turns; and
an additional coil for energizing the write pole and including an additional plurality of turns, the write pole residing between the additional coil and the coil, an additional turn of the additional plurality of turns having a first additional portion and a second additional portion, the first additional portion having a first additional length in the stripe height direction, the second additional portion having a second additional length in the stripe height direction, the second additional length being greater than the first additional length and extending to at least one adjacent additional turn of the additional plurality of turns.
2. The magnetic transducer of claim 1 wherein the coil and the additional coil form at least one helical coil.
3. The magnetic transducer of claim 1 wherein the coil and the additional coil are pancake coils.
4. The magnetic transducer of claim 1 wherein the first portion of the turn of the plurality of turns has a first substantially rectangular cross section and wherein the second portion of the first turn has a second substantially rectangular cross section.
5. The magnetic transducer of claim 1 wherein the first portion has a first edge and a second edge, the first edge being between the second edge and the ABS and wherein the second portion extends over the first edge and the second edge.
6. The magnetic transducer of claim 5 wherein the second portion is substantially centered on the first portion.
7. The magnetic transducer of claim 1 wherein the second portion extends at least one-half way across the adjacent turn in the stripe height direction.
8. The magnetic transducer of claim 1 wherein each of the plurality of turns has a bottom surface proximate to the pole and wherein the bottom surface of the turn is further from the pole than the bottom surface of the adjacent turn.
9. The magnetic transducer of claim 1 wherein the turn includes a third portion having a third length in the stripe height direction, the third length being greater than the first length.
10. The magnetic transducer of claim 9 wherein the first portion is between the second portion and the third portion.
11. The magnetic transducer of claim 1 wherein the yoke has a length of not more than 4.5 microns.
12. The magnetic transducer of claim 1 further comprising:
a shield, the coil residing between a portion of the shield and the write pole.
13. The magnetic recording transducer of claim 12 wherein the shield is a single piece shield.
14. The magnetic recording transducer of claim 1 further comprising:
an aluminum oxide insulator for electrically insulating the coil from the write pole and one the plurality of turns from another of the plurality of turns.
15. The magnetic transducer of claim 1 wherein the write pole is a perpendicular magnetic recording pole.
16. The magnetic transducer of claim 1 wherein the magnetic transducer is an energy assisted magnetic recording transducer.
17. A magnetic transducer having air-bearing surface (ABS) comprising:
a write pole including a pole tip and a yoke having a yoke length of not more than 4.5 microns;
a plurality of coils for energizing the write pole, the plurality of coils including a first coil and a second coil, the first coil including a plurality of turns, a turn of the plurality of turns having a first portion and a second portion, the first portion having a first length in a stripe height direction substantially perpendicular to the ABS, the second portion having a second length in the stripe height direction, the second length being greater than the first length and extending to at least one-half way across at least one adjacent turn of the plurality of turns in the stripe height direction, the second coil including an additional plurality of turns, the write pole residing between the second coil and the first coil, an additional turn of the additional plurality of turns having a first additional portion and a second additional portion, the first additional portion having a first additional length in the stripe height direction, the second additional portion having a second additional length in the stripe height direction, the second additional length being greater than the first additional length and extending to at least one-half way across at least one adjacent additional turn of the additional plurality of turns;
a one-piece shield proximate to the ABS, the first coil residing between a portion of the one-piece shield and the write pole;
an aluminum oxide insulator for electrically insulating the first coil from the write pole and one the plurality of turns from another of the plurality of turns.
18. A disk drive comprising:
a media,
a slider, and
a magnetic transducer coupled with the slider, the magnetic transducer having air-bearing surface (ABS), a write pole, a coil for energizing the write pole and an additional coil, the write pole having a pole tip and a yoke, the coil including a plurality of turns, a turn of the plurality of turns having a first portion and a second portion, the first portion having a first length in a stripe height direction substantially perpendicular to the ABS, the second portion having a second length in the stripe height direction, the second length being greater than the first length and extending to at least one adjacent turn of the plurality of turns, the additional coil for energizing the write pole and including an additional plurality of turns, the write pole residing between the additional coil and the coil, an additional turn of the additional plurality of turns having a first additional portion and a second additional portion, the first additional portion having a first additional length in the stripe height direction, the second additional portion having a second additional length in the stripe height direction, the second additional length being greater than the first additional length and extending at least to at least one adjacent additional turn of the additional plurality of turns.