R&D: Application of Updated Landau–Lifshitz–Bloch Equations to HAMR
Analysis of macro-spin magnetization dynamics described by LLB equation to issues in future magnetic recording which combined HAMR with bit-patterned media.
This is a Press Release edited by StorageNewsletter.com on February 1, 2018 at 2:23 pmIEEE Transactions on Magnetics ( Volume: 54, Issue: 2, Feb. 2018 ) has published an article written by Terry W. McDaniel , Model Physics, Volcano, CA, USA
Abstract: “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.“
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