AFFECTS OF SKEW ANGLE ON THE WRITTEN-IN BASE-LINE SHIFT (BLS) SIGNAL AT HIGH TRACK DENSITIES

The track edge charge distribution responsible for the base line shift (BLS) in the MR readback waveform is studied through skew angle measu rements. A model based on a finite element head field calculation and micromagnetic simulation is utilized to understand the track edge char ge formation responsible for the BLS signal. The modeling results show that the spatial distribution of the dipole charge profile in the cro ss track direction becomes asymmetric when transitions are written at skew angles. This explains the observed asymmetry in the measured base line shift profile.