Noise Mitigation in Granular and Bit-Patterned Media for HAMR

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...

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Bibliographic Details
Published inIEEE transactions on magnetics Vol. 51; no. 4; pp. 1 - 7
Main Authors Victora, R. H., Sumei Wang, Pin-Wei Huang, Ghoreyshi, Ali
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2015
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Heat-assisted magnetic recording
Heating
Jitter
Magnetic heads
Magnetic tape
Magnetism
Media
Noise
R&D
Research & development
Temperature distribution
noise
heat assisted magnetic recording (HAMR)
FePt
Bit-patterned media (BPM)
granular media
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Summary: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 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 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 2 by observing successful and deterministic switching under a realistic temperature distribution.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2014.2353660