Write element with recessed pole and heat sink layer for ultra-high density writing
View Patent ↗A head including a write element for writing data to a magnetic media, and methods for its production are provided. A write element of the invention includes one or more of a recessed first pole, a heat sink layer, and a shortened yoke length. A method of the invention provides forming an anti-reflective layer before forming a mask layer. During photolithography the anti-reflective layer suppresses undesirable reflections off of features, such as vertical sidewalls, that otherwise limit how closely to such features portions of the mask layer can be formed.
1. A write element comprising:
a bottom pole including a face recessed from a terminus surface;
a top pole;
a P2 layer disposed between the bottom and top poles and including
a P2 pole connected to the top pole,
a P2 backgap providing magnetic communication between the bottom and top poles; and
a coil having turns disposed between the P2 pole and the P2 backgap; and
a heat sink layer turning around the P2 backgap but not around the P2 pole and including less than two turns around the P2 backgap, the heat sink layer in electrical communication with the coil and disposed at least partially between the coil and the top pole.
2. The write element of claim 1 further comprising a TS insulation layer abutting the face of the bottom pole.
3. The write element of claim 2 wherein the TS insulation layer is formed of Al 2 O 3 .
4. The write element of claim 1 wherein the face is recessed from the terminus surface by less than 1 μm.
5. The write element of claim 1 wherein the face is recessed from the terminus surface by between about 0.1 μm and about 0.5 μm.
6. The write element of claim 1 further comprising a bottom pole pedestal disposed between the bottom pole and the P2 pole.
7. The write element of claim 6 wherein the bottom pole pedestal includes a high moment magnetic material possessing a higher magnetic moment than the bottom pole.
8. A write element comprising:
a bottom pole;
a top pole joined to the bottom pole by a P2 backgap;
a coil disposed between the bottom and top poles; and
a heat sink layer making a complete turn around the P2 backgap but less than two turns around the P2 backgap, the heat sink layer in electrical communication with the coil and at least partially disposed between the coil and the top pole.
9. The write element of claim 8 wherein the heat sink layer includes copper.
10. The write element of claim 8 further comprising
a P3 insulation layer between the top pole and the heat sink layer, and
a coil insulation layer between the coil and the heat sink layer,
wherein the heat sink layer is disposed within a volume defined between the P3 insulation layer and the coil insulation layer.
11. The write element of claim 10 wherein the heat sink layer fills the volume.
12. The write element of claim 8 wherein an aspect ratio of the heat sink layer is 20 or more.
13. The write element of claim 8 wherein a ratio of a width of the heat sink layer to a width of the coil is at least 10.