Composite structure with superparamagnetic writing layer for heat-assisted magnetic recording

Zengyuan Liu, Randall H Victora

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


In conventional heat-assisted magnetic recording media, the recording layer also acts as the storage layer. To minimize the effect of Tc variance, a new composite structure with a superparamagnetic writing layer is proposed to decouple the recording problem from the long-term storage issue. The thermal switching probability distribution (SPD) was calculated using 1nm × 1nm × 1nm renormalized parameters of FePt. Analytical derivation and micro-magnetic simulation results both show the volume dependence of the SPD Width ∞ 1/(Volume)1/2. The SPD of the composite structure designed in this paper has a full-width half-maximum of 44 K, which is 20% narrower than that found in an FePt recording layer subject to 3% Tc variance.

Original languageEnglish (US)
Article number7389395
JournalIEEE Transactions on Magnetics
Issue number7
StatePublished - Jul 2016

Bibliographical note

Publisher Copyright:
© 1965-2012 IEEE.


  • Composite Media
  • Heat Assisted Magnetic Recording
  • Superparamagnetic Writing


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