R&D: Superior Role of Gilbert Damping on Signal-to-Noise Ratio in HAMR
With bit length has major effect on SNR whereas other write head and material parameters only have minor relevance on SNR.
This is a Press Release edited by StorageNewsletter.com on July 23, 2019 at 2:02 pmarXiv.org > physics has published an article written by Olivia Muthsam, Florian Slanovc, Christoph Vogler, and Dieter Suess, University of Vienna, Physics of Functional Materials, Boltzmanngasse 5, 1090 Vienna, Austria.
Abstract: “In magnetic recording the signal-to-noise ratio (SNR) is a good indicator for the quality of written bits. However, a priori it is not clear which parameters have the strongest influence on the SNR. In this work, we investigate the role of the Gilbert damping on the SNR. Pure hard magnetic bits with two different grain sizes d1=5nm and d2=7nm are considered and simulations of heat-assisted magnetic recording (HAMR) are performed with the atomistic simulation program VAMPIRE. The simulations display that the SNR saturates for damping constants larger or equal than 0.1. Additionally, we can show that the Gilbert damping together with the bit length have a major effect on the SNR whereas other write head and material parameters only have a minor relevance on the SNR.“
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