Relationship between temperature rise and thermal conductivity in a magnetic medium during heated dot magnetic recording

Abstract

In this study, we investigated the relationship between the temperature rise in recording dots of a bit-patterned medium and its thermal conductivity during heated dot magnetic recording (HDMR) using numerical calculation (electromagnetic field and heat conduction analyses). When the thermal conductivities of the recording and heat sink layers were anisotropic, the temperature rise of a dot’s lower cell could be increased while maintaining a small temperature difference between the upper and lower cells. The HDMR process was calculated via micromagnetic simulation using the Landau–Lifshitz–Bloch equation at vertical and in-plane thermal conductivities of 24.0 and 1.0 W mK−1 (12.0 and 10.0 W mK−1), respectively, for the recording (heat sink) layer. Results showed a bit error rate of 0%, and thus almost no error.