Dependence of Bit Error Rates on HAMR Transition Curvatures

Kun Xue, R. H. Victora

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    1 Scopus citations


    Transition curvature limits the performance of heat-assisted magnetic recording (HAMR), especially when bit length (BL) is reduced below 10 nm. In this article, in order to quantify this issue, the dependence of signal-to-noise ratios (SNRs) and bit error rates (BERs) on HAMR transition curvatures is investigated utilizing previously obtained curvature values. An artificial recording method is used and a Viterbi algorithm is applied to decode the readback signals and calculate BERs. A pseudorandom binary sequence (PRBS) is used. Two BLs are tested: 7.5 and 8.5 nm. Different reader widths (RWs), shield-to-shield distances, and magnetic fly heights are studied in order to seek optimized reader configurations. Generally, transition curvatures have a negative effect on SNR and BER performance, but this effect can be mitigated by the reduction of certain reader dimensions.

    Original languageEnglish (US)
    Article number3201105
    JournalIEEE Transactions on Magnetics
    Issue number8
    StatePublished - Aug 1 2022

    Bibliographical note

    Publisher Copyright:
    © 1965-2012 IEEE.


    • Bit error rate (BER)
    • heat-assisted magnetic recording (HAMR)
    • signal-to-noise ratio (SNR)
    • transition curvature


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