Patent ID: 8841007
Filing Date: 2014-09-23
Classification: G11B

Abstract:
1. A magnetic stack comprising: a magnetic recording layer; a soft magnetic underlayer (SUL) disposed between a substrate and the magnetic recording layer; a heatsink disposed between the SUL and the magnetic recording layer and having a first thermal conductivity to dissipate heat from a heat assisted magnetic recording (HAMR) module used to write data to the magnetic recording layer, the heatsink further having a non-zero magnetic permeability; a transition layer disposed between the heatsink and the SUL configured as a diffusion barrier layer to reduce interdiffusion of atoms between the SUL and the heatsink; and a thermal optimization layer disposed between the heatsink and the magnetic recording layer configured as a thermal resistor having a second thermal conductivity which tunes a thermal energy saturation through the magnetic stack.