The impact of increasing layer thickness on magnetization, resistivity, magnetoresistance and Hall effect in Cu/Ni multilayers

摘要

The magnetization, magnetoresistance, and Hall resistivity of Cu/Ni multilayers monotoni-cally increase with increasing layer thicknesses of these two metals. On the other hand, the resistivity, and the change in the Hall resistivity monotonically decrease with the corresponding change in layer thicknesses. The phenomena of an oscillatory magnetoresistance, which is observed in similar multilayered systems, was not observed in this study. In the past, researchers had observed oscillatory magnetoresistance by maintaining the magnetic layer thickness at a constant value while varying the non-magnetic layer thickness. In this study, both the Cu as well as the Ni layer thicknesses were varied in equal amounts to minimize any differences which may arise due to the size effect of the two elements. It seems that the size effect has a decisive impact on the magnetoresistance of Cu/Ni multi-layers.