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R&D: HAMR Versus PMR, Comparative Study of Signal-Noise Performance

Resolution for small bit detection depends on reader shield orientation to HAMR-written curved transition beneath read free layer.

IEEE Transactions on Magnetics has published an article written by Rizvi Ahmed, Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, USA, M. Fatih Erden, Pavol Krivosik, Seagate Technology LLC, Bloomington, MN, USA, and R. H. Victora, Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN, USA.

Abstract:A micromagnetic simulation-based comparative study between perpendicular magnetic recording (PMR) and heat-assisted magnetic recording (HAMR) has been performed. Signal-to-noise ratio (SNR) is adopted as the metric of comparison, and various system parameters are considered, including fly-height (FH), write-track distance, and rotary motion of the head-stack-assembly (skew). It is found that even a HAMR system with a wide 60 nm full-width at half-maximum thermal profile demonstrates better SNR performance when compared to an optimized PMR system at a magnetic FH of 8 nm. The impact of skew on a single reader system is found to be minor for both PMR and HAMR, but the impact on a dual reader 2-D recording system differs substantially. In particular, the resolution for small bit detection depends greatly on reader shield orientation to the HAMR-written curved transition beneath the read free layer.

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