Energy assisted discrete track media with heat sink
View Patent ↗A discrete track perpendicular magnetic recording (PMR) disk and a method of fabricating the disk are described. The PMR disk may include a heat sink layer disposed above a substrate, intermediate layers disposed above the heat sink layer, and a magnetic recording layer disposed above the intermediate layers. The magnetic recording layer may have raised and recessed areas, where a heat conductive material may be disposed within one or more of the recessed areas.
1. A perpendicular magnetic recording (PMR) disk, comprising:
a substrate;
a heat sink layer being different than the substrate and disposed above the substrate;
a plurality of intermediate layers disposed above the heat sink layer;
a magnetic recording layer disposed above the plurality of intermediate layers, the magnetic recording layer having a plurality of raised areas and recessed areas formed therein;
a heat sink material disposed within one or more of the plurality of recessed areas; and
an amorphous layer disposed between the substrate and the heat sink layer, wherein the substrate comprises glass, the heat sink layer comprises copper and the amorphous layer comprises tantalum.
2. The PMR disk of claim 1 , wherein the heat sink material is disposed in all of the plurality of recessed areas.
3. The PMR disk of claim 1 , wherein the magnetic recording layer has a top surface and a thickness, and wherein the recessed areas extend down from the top surface at least 25 percent of the thickness of the magnetic recording layer.
4. The PMR disk of claim 3 , wherein the recessed areas extend completely through magnetic recording layer.
5. The PMR disk of claim 3 , wherein one of the plurality of intermediate layers comprises a soft magnetic underlayer (SUL) and wherein the recessed areas extend down through one or more of the plurality of intermediate layers to the SUL.
6. The PMR disk of claim 5 , wherein the one or more of the plurality of intermediate layers through which the recessed areas extend comprise nucleation layers.
7. The PMR disk of claim 1 , wherein the heat sink material disposed within the plurality of recessed areas comprises a metal.
8. The PMR disk of claim 1 , wherein the heat sink material disposed within the plurality of recessed areas comprises a metal alloy.
9. The PMR disk of claim 1 , wherein the heat sink material disposed within the plurality of recessed areas comprises copper.
10. The PMR disk of claim 1 , wherein the heat sink material disposed within the plurality of recessed areas comprises diamond like carbon (DLC).
11. The PMR disk of claim 1 , wherein the heat sink material disposed within the plurality of recessed areas comprises silver.
12. The PMR disk of claim 1 , wherein the heat sink material disposed within the plurality of recessed areas comprises gold.
13. The PMR disk of claim 1 , wherein the heat sink material disposed within the plurality of recessed areas has a conductivity greater than 100 Watts per meter Kelvin.
14. A perpendicular magnetic recording (PMR) disk, comprising:
a substrate;
a heat sink layer being different than the substrate and disposed above the substrate;
a plurality of intermediate layers disposed above the heat sink layer;
a magnetic recording layer disposed above the plurality of intermediate layers, the magnetic recording layer having a plurality of raised areas and recessed areas formed therein; and
a heat sink material disposed within one or more of the plurality of recessed areas, wherein each raised area is surrounded by a first adjacent recessed area and a second adjacent recessed area being on opposite sides of a raised area, and wherein at least one of the first and second adjacent recessed areas has the heat sink material disposed therein, and wherein the other one of the first and second adjacent recessed areas comprises an air gap.