Abstract
The methodology of the micromagnetic theory for modeling micro-track profiles is discussed. Consistent results are obtained from modeling and experiments. Then, this theory is used to investigate the micro-track profile behavior in different current distributions at sensor junctions with different permanent magnet (PM) Mrt (remanent magnetization/spl times/thickness). It is found that a lower Mrt can lead to different microtrack profiles in different current distributions. With the PM Mrt there is less current distribution effect. Thus, ones could use this approach indirectly to estimate the PM field in sensors, which is of importance in spin valve head design.
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