Coil inductive writer having a low inductance and short yoke length
View Patent ↗A method and system for providing a thin film recording head are disclosed. The method and system include providing a first pole, providing a second pole and providing a write gap separating the first pole from the second pole. The method and system further include providing at least one coil having a plurality of turns. A portion of each of the plurality of turns is between the first and the second pole. The plurality of turns wind around the second pole.
1. A thin film recording head comprising:
a first pole;
a second pole consisting of a group of materials;
a write gap separating the first pole from the second pole; and
at least one coil having a plurality of turns, a portion of each of the plurality of turns being between the first and the second pole, the plurality of turns around a portion of the second pole, the at least one coil further including
a bottom portion residing between the first pole and the second pole, the bottom potion including a first plurality of conductive bars;
a top portion residing above the second pole, the top portion including a second plurality of conductive bars; and
a pad portion including a plurality of pads, the plurality of pads electrically connecting the bottom portion to the top portion, the pad portion comprising each and every one of the materials in the group.
2. The thin film recording head of claim 1 wherein the bottom portion and the top portion are nonmagnetic conductors.
3. The thin film recording head of claim 1 wherein the top portion is offset from the bottom portion such that the plurality of turns winds around the second pole.
4. The thin film recording head of claim 1 wherein the pad portion includes a nonmagnetic material.
5. The thin film recording head of claim 1 further comprising:
an insulating layer between the at least one coil and the first pole.
6. The thin film recording head of claim 1 wherein the plurality of turns further have a coil pitch, the coil pitch being less than or equal to 1.5 μm.
7. The thin film recording head of claim 6 wherein the plurality of turns includes between two and six turns, wherein the plurality of turns have a pitch of 1.5 μm and wherein the second pole has a yoke length of between five and fourteen μm.
8. A thin film recording head comprising:
a first pole;
a second pole;
a write gap separating the first pole from the second pole; and
at least one coil having a plurality of turns, a portion of each of the plurality of turns being between the first and the second pole, the plurality of turns around a portion of the second pole, the at least of coil further including:
a bottom portion residing between the first pole and the second pole, the bottom potion including a first plurality of conductive bars;
a top portion residing above the second pole, the top portion including a second plurality of conductive bars; and
a pad portion including a plurality of pads, the plurality of pads electrically connecting the bottom portion to the top portion, the pad portion including a magnetic material, wherein the magnetic material is NiFe.
9. A method for providing a thin film recording head comprising the steps of:
(a) providing a first pole;
(b) providing a second pole consisting of a group of materials;
(c) providing a write gap above the pedestal of the first pole, the second portion of the first pole being adjacent to the write gap;
(d) providing at least one coil having a plurality of turns, a portion of each of the plurality of turns being between the first and the second pole, the plurality of turns around the second pole, the step of providing the at least of coil (d) further includes the steps of:
(d1) providing a bottom portion residing between the first pole and the second pole, the bottom potion including a first plurality of conductive bars;
(d2) providing a pad portion including a plurality of pads, the plurality of pads comprising each and every one of the materials in the group; and
(d3) providing a top portion residing above the second pole, the top portion including a second plurality of conductive bars, the plurality of pads electrically connecting the bottom portion to the top portion.
10. The method of claim 9 wherein the bottom portion and the top portion are nonmagnetic conductors.
11. The method of claim 9 wherein the top portion is offset from the bottom portion such that the plurality of turns winds around the second pole.
12. The method of claim 9 wherein the step of providing the pad portion (d2) includes the step of:
(d2i) providing the plurality of pads composed of a nonmagnetic material.
13. The method of claim 9 further comprising the step of:
(e) providing an insulating layer between the at least one coil and the first pole.
14. The method of claim 9 wherein the plurality of turns further have a coil pitch, the coil pitch being less than or equal to 1.5 μm.
15. The method of claim 14 wherein the plurality of turns includes between two and six turns, wherein the plurality of turns have a pitch of 1.5 μm and wherein the second pole has a yoke length of between five and fourteen μm.
16. A method for providing a thin film recording head comprising the steps of:
(a) providing a first pole;
(b) providing a second pole;
(c) providing a write gap above the pedestal of the first pole, the second portion of the first pole being adjacent to the write gap;
(d) providing at least one coil having a plurality of turns, a portion of each of the plurality of turns being between the first and the second pole, the plurality of turns around the second pole, the step of providing at least one coil further including
(d1) providing a bottom portion residing between the first pole and the second pole, the bottom potion including a first plurality of conductive bars;
(d2) providing a pad portion including a plurality of pads, wherein the step of providing the pad portion (d2) includes the step of:
(d2i) providing the plurality of pads composed of a magnetic material; and
(d3) providing a top portion residing above the second pole, the top portion including a second plurality of conductive bars, the plurality of pads electrically connecting the bottom portion to the top portion;
wherein the magnetic material is NiFe.