Write Modeling and Read Signal Processing for Heat-Assisted Bit-Patterned Media Recording

Heat-assisted bit-patterned media recording (HABPMR) can significantly improve channel areal density due to the increased effective write field gradient provided by heat assistance and decreased media jitter offered by bit-patterned media. In this paper, an analytical write channel model, which can...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2018-02, Vol.54 (2), p.1-10
Main Authors: Yao Wang, Vijaya Kumar, B. V. K.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Anisotropy
Bit error rate
Bit-patterned media
Clocks
Curie temperature
Equalization
heat-assisted magnetic recording (HAMR)
Magnetic islands
Magnetism
Mathematical model
Mathematical models
Media
Offsets
Perpendicular magnetic anisotropy
Recording
Signal processing
Switches
Synchronism
Variation
Vibration
write mis-synchronization
write/read channel
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Summary:Heat-assisted bit-patterned media recording (HABPMR) can significantly improve channel areal density due to the increased effective write field gradient provided by heat assistance and decreased media jitter offered by bit-patterned media. In this paper, an analytical write channel model, which can accurately capture the effects of Curie temperature, magnetic island position and size, anisotropy field, and write clock frequency fluctuations, is introduced and investigated for HABPMR. For read signal processing study, a read channel characterizing the media noise and reader geometry is combined with a data-dependent write channel to obtain the readback signal. In addition, the allowable write window offsets, write error rate during the write process and the bit error rate after readback as function of various noise sources are studied. Furthermore, 2-D equalization followed by the Bahl-Cocke-Jelenik-Raviv detector combined with picket-shift code is used to mitigate the 2-D interference and correct the burst errors caused by the write clock mis-synchronization. It is shown, via numerical experiments, that the proposed approach can provide significant symbol error rate performance improvement compared to a channel with conventional Reed Solomon code.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2017.2775600