Estimation of transition jitter from noise spectrum
Details
The transition position jitter which is one of the dominant source of the medium noise in double-layered perpendicular magnetic recording media corresponds to the noise power spectrum. The average transition waveform gives the discrete signal spectrum. The CN ratio for the Fourier spectrum of the waveform with the transition jitter was compared with that of the measured spectrum in order to estimate the jitter value. Applying the jitter estimation method to a Co-Cr-Nb-Pt double-layered perpendicular magnetic recording medium, the jitter value was suggested to be small.
