Read-head Conditions for Obtaining Areal Recording Density of 5.8Tbit/in.~2 on a Bit-Patterned Medium

摘要

The optimum magneto-resistive read-head (MR head) conditions, namely, read track width (TWR) and shield gap (G_8), with a bit-patterned medium (BPM) for areal recording density of 5.8Tbit/in.~2 were determined by analytical calculation. Signal-to-noise ratio at a linear recording density of 1124 kfci (SNR_(1124kfci)) and crosstalk were calculated in consideration of head noise, and optimum TWR and G_8 were obtained from the calculation results. The effect of intertrack interference cancellation (ITIC) was investigated by using a signal-processing simulator. The investigation shows that intertrack interference cancellation decreases bit error rate. Moreover, to obtain bit error rate of 10~(-3) and SNR_(1124kfci) of 14dB, TWR can be increased to about two times track pitch for G_8 of 15 nm. For obtaining SNR_(1124kfci) of 14dB, TWR should be 15nm at σ/D_ave of 5% or TWR should be 11 nm at σ/D_ave of 10%. These results demonstrate that ITIC effectively decreases bit error rate and thus contributes to attaining areal recordin density of 5.8Tbit/in.~2.