Noise mitigation in granular and bit-patterned media for HAMR

Randall H Victora, Sumei Wang, Pin Wei Huang, Ali Ghoreyshi

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Feasibility of heat assisted magnetic recording for granular and bit-patterned media (BPM) is evaluated in the context of various noises. Using micromagnetic simulation of renormalized media cells, we predict that the jitter is only 0.58 nm at a head speed of 10 m/s for the bilayer structure of FeRh/FePt when the grain size is 3.2 nm, validating the possibility of 6 Tb/in $^{\mathrm {\mathbf {2}}}$. We propose a new structure FePt/Cr/X/FePt that uses a Cr layer to produce an antiferromagnetic coupling that mimics the behavior of FeRh/FePt. We also confirmed the consistency of our renormalization approach for cell sizes from 1.0 to 1.5 nm. The temperature distribution is analyzed for BPM for areal densities of 2.2-5 Tb/in $^{\mathrm {{2}}}$. We have predicted the maximum tolerable on-track bit temperatures at different areal densities and filling factors and substantiate the feasibility of BPM at 5 Tb/in $^{\mathrm {{2}}}$ by observing successful and deterministic switching under a realistic temperature distribution.

Original languageEnglish (US)
Article number7109984
JournalIEEE Transactions on Magnetics
Volume51
Issue number4
DOIs
StatePublished - Apr 1 2015

Keywords

  • Bit-patterned media (BPM)
  • FePt
  • granular media
  • heat assisted magnetic recording (HAMR)
  • noise

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