Temperature dependence of the magnetoresistance in a zigzag ultrathin permalloy wire

Abstract

Domain wall resistivity of a zigzag ultrathin permalloy wire has been studied from 10 to 300 K. Multi-domain state resistivity is 59.589×10 −6 Ω cm, while single-domain state resistivity is 59.665×10 −6 Ω cm at 10 K. Domain wall resistivity is nearly independent of the temperature between 10 and 300 K. However, the domain wall switching field decreases rapidly with increasing temperature from 120 Oe at 10 K to 20 Oe at 300 K. These results can be explained by the effect of domain wall scattering, micromagnetic structure and ferromagnetic resistance anisotropy of the zigzag wire.