MFM observations on oriented and isotropic media are used to identify the source of side bumps seen for microtrack profiles written with a shared pole MR head. The effect is shown to arise from side writing and the orientation of the medium. MFM results for a pole-trimmed writer are also presented and the side-writing effect is shown to be diminished on isotropic media.
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George et al. (1996) studied this question.
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