Isolated transitions, recorded with a thin-film inductivc head on isotropic film media and read with a magnetoresistive (MR) sensor can exhibit waveform distortions, characterized by a shift of the base line between readback pulses. The amount of this base-line shift (BLS) increases with increasing write current, decreasing trackwidth and decreasing medium coercivity. The source of the DLS is shown experimentally to be localized at the track edges. A model, based on the creation of magnetic dipoles along each cdge of a data track is proposed to explain the observed waveform deformation. Quantitative measurcments of the
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