Abstract
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 language | English (US) |
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Article number | 3201105 |
Journal | IEEE Transactions on Magnetics |
Volume | 58 |
Issue number | 8 |
DOIs | |
State | Published - Aug 1 2022 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 1965-2012 IEEE.
Keywords
- Bit error rate (BER)
- heat-assisted magnetic recording (HAMR)
- signal-to-noise ratio (SNR)
- transition curvature