Magnetic write head having helical coil with a fin structure for reduced heat induced protrusion
View Patent ↗A magnetic write head having a write coil configured to dissipate heat away from the write head to minimize thermal protrusion. The write coil is formed as a helical coil having upper and lower leads that are connected by electrically conductive studs formed therebetween. The first and leads extend beyond the studs to form heat conducting fins that conduct heat away from the write head where it can be dissipated into surrounding structure.
1. A magnetic write head, comprising:
a magnetic write pole extending to an air bearing surface;
a magnetic return pole, magnetically connected with the write pole in a region removed from the air bearing surface;
a helical coil arranged around the write pole so as to induce a magnetic flux in the write pole when electrical current flows through the write coil, the write coil further, comprising:
a plurality of lower, substantially planar leads disposed in a leading direction relative to the write pole;
a plurality of upper, substantially planar leads disposed in a leading direction relative to the write pole; and
a plurality of electrically conductive studs, each electrically conducting stud connecting one of the lower leads with an upper lead, and wherein each of upper and lower leads extends beyond the electrically conductive stud to which it is connected to form a heat conducting fin extending laterally outward for dissipating heat from the write head.
2. A magnetic write head as in claim 1 wherein the heat conducting fin conducts heat away from the write pole to prevent thermally induced protrusion of the write pole during operation.
3. A write head as in claim 1 wherein the at least one heat conducting fin has a length of 10-20 um.
4. A write head for perpendicular magnetic data recording, comprising:
a magnetic write pole having a pole tip extending to an air bearing surface;
a magnetic return pole that is magnetically connected with the write pole in a region removed from the air bearing surface;
a plurality of electrically conductive, substantially planar lower coil leads formed beneath the write pole;
a plurality of electrically conductive, substantially planar upper coil leads formed above the write pole;
a first set of electrically conductive studs, formed on a first side of the write pole each of the first set of electrically conductive studs connecting one of the electrically conductive upper leads with a one of the electrically conductive lower leads; and
a second set of electrically conductive studs, formed on a second side of the write pole each of the second set of electrically conductive studs connecting one of the electrically conductive upper leads with a one of the electrically conductive lower leads; wherein
at least one of the upper and at least one of the lower electrically conductive leads extends beyond an electrically conductive stud connected therewith to form a heat conducting fin laterally outward.
5. A magnetic write head as in claim 4 wherein the fin conducts heat away from the write pole during operation of the write head.
6. A magnetic write head as in claim 4 wherein electrically conductive upper coil leads, electrically conductive lower coil leads and electrically conductive studs together form an electrically conductive, helical write coil through which an electrical current can flow.
7. A magnetic write head as in claim 4 wherein electrically conductive upper coil leads, electrically conductive lower coil leads and electrically conductive studs together form an electrically conductive, helical write coil through which an electrical current can flow, the coil having a width defined by the distance between the first set of studs and the second set of studs.
8. A magnetic write head as in claim 4 wherein the electrically conductive upper coil leads, the electrically conductive lower coil leads and the electrically conductive studs together form an electrically conductive, helical write coil through which an electrical current can flow, the coil having a width W defined by the distance between the first set of studs and the second set of studs, and wherein the heat conducting fin extends from the coil by a distance that is at least as great as the width W.
9. A magnetic write head as in claim 4 wherein the electrically conductive upper coil leads, the electrically conductive lower coil leads and the electrically conductive studs together form an electrically conductive, helical write coil through which an electrical current can flow, the coil having a width W defined by the distance between the first set of studs and the second set of studs, and wherein the heat conducting fin extends from the coil by a distance of 10-20 um.
10. A magnetic write head as in claim 4 wherein each of the electrically conductive upper coil leads extends laterally outward beyond an electrically conductive stud connected therewith to form a heat conducting fin.
11. A magnetic write head as in claim 4 wherein each of the electrically conductive lower coil leads extends laterally outward beyond an electrically conductive stud connected therewith to form a heat conducting fin.
12. A magnetic write head as in claim 4 wherein each of the electrically conductive lower coil leads and each of the electrically conductive upper coil leads extends laterally outward beyond an electrically conductive stud connected therewith to form a heat conducting fin.
13. A magnetic write head as in claim 4 further comprising a plurality of heat conducting fins formed at a first side of the write pole and a plurality of heat conducting fins formed at a second side of the write pole.
14. A magnetic write head as in claim 4 further comprising a plurality of heat conducting fins extending from the upper electrically conductive coil leads at both first and second sides of the write pole and a plurality of heat conducting fins extending from the lower leads at both the first and second sides of the write pole.