Investigation of re-switching properties of ferromagnetic contacts inPy/Mo microstructures

摘要

By means of magnetoresistance and magnetic force microscopy (MFM) measurements the electrical and magnetic properties of ferromagnetic strips and crosses of hybrid nanostructures Py/Mo (Py — permalloy (Ni_80 Fe_20), Mo -molybdenum) have been investigated. Unusual behaviour of the cross magnetoresistance in these nanostructures was found. The dependences of the cross resistance against external magnetic field have the image of the curves with hysteresis typical for anisotropic magnetoresistance (AMR). However, they demonstrate anomalous magnetoresistance dependence on orientation relatively to the axis of the ferromagnetic arm of the cross. In the transverse magnetic field (perpendicular to the axis of the ferromagnetic arm) magnetoresistance has two minima as for the longitudinal AMR. In the longitudinal magnetic field (parallel to the axis of ferromagnetic arm) there are two maxima, typical for the transverse AMR. The value of the effect is about one percent. The AMR of the strip has the supplementary extremes, indicated on a more complex character of magnetization reversal, depended on the shape of nanostructures. The data of the magnetoresistance measurements are compared with MFM images.