HAMR Medium Structure Design and Its Process for Excellent Thermal Performance

The L1
₀
ordered FePt-based medium with a novel thermal design for heat-assisted magnetic recording (HAMR) application has been demonstrated. The proposed seed-then-heat sink approach using the (001) textured Cu
₃
N as the underlayer to induce the MgO (200) texture at room temperature. The high temperature process for FePtX granular film deposition resulted in the decomposition of the Cu
₃
N to Cu and made it a suitable heat sink layer. Our approach eliminated the effect of the boundary thermal resistance and enabled a large thermal gradient during the writing process, which is critical to the FePt-based medium for HAMR application.