HAMR Versus PMR: A Comparative Study of Signal-Noise Performance

Rizvi Ahmed, M. Fatih Erden, Pavol Krivosik, R. H. Victora

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number8903508
JournalIEEE Transactions on Magnetics
Issue number12
StatePublished - Dec 2019

Bibliographical note

Publisher Copyright:
© 1965-2012 IEEE.


  • Heat-assisted magnetic recording (HAMR)
  • information storage
  • perpendicular magnetic recording (PMR)
  • signal-to-noise ratio (SNR)


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