Analysis of Magnetization Patterns in Perpendicular Recording Using Absolute Best Basis Wavelet Representation

An ideal analysis of read-back signal should include a variable time and frequency resolution capability in order to best represent noise behavior near transitions. Therefore, wavelet analysis methods are well suited for the study of media noise characteristics. The presentation will include a detailed ABB wavelet study to determine the impact of write current, recording density, and head-media separation on the media noise characteristics. The time-frequency resolution capability of the wavelet method will also be applied in the cross track direction to understand the variation of the cross-track noise in the transition and saturated regions. The off-track sections of the track also present themselves as interesting regions to understand the effect of the weaker head fields on the noise.