Application of Updated Landau–Lifshitz–Bloch Equations to Heat-Assisted Magnetic Recording

Previously, we applied analysis of macro-spin magnetization dynamics described by the Landau-Lifshitz-Bloch (LLB) equation to issues in the future magnetic recording which combined heat-assisted magnetic recording (HAMR) with bit-patterned media (BPM). In this paper, we use updated versions of the LLB equation to revisit the magnetic switching reliability as an HAMR head is passed over a single, isolated grain of a bit-patterned medium. Areal density was varied, while the packing density of the BPM was set to 0.4 or 0.5. LLB writing reliability is also assessed with the Arrhenius-Nèel theory that has been upgraded with recent work related to the Stoner-Wohlfarth model to add understanding of the role of thermodynamics in thermomagnetic recording and the long-time stability of magnetic reversal.