Current distribution effect on micro-track profiles in spin valve devices

The methodology of the micromagnetic theory for modeling micro-track profil es is discussed. Consistent results are obtained from modeling and experime nts. Then, this theory is used to investigate the micro-track profile behav ior in different current distributions at sensor junctions with different p ermanent magnet (PM) Mrt (remanent magnetization x thickness). It is found that a lower Mrt can lead to different microtrack profiles in different cur rent distributions. With the PM Mrt there is less current distribution effe ct. Thus, ones could use this approach indirectly to estimate the PM field in sensors, which is of importance in spin valve head design.