Universal Scaling of Ballistic Magnetoresistance in Magnetic Nanocontacts

摘要

We show that ballistic magnetoresistance exhibits universal scaling in atomic or nanometer scalecontacts. Plotting the data as conductance, we find that, if the maximum magnetoconductance isnormalized to unity and the conductance is scaled with the conductivity of the bulk material, the datafall in a narrow region, independent of the nanocontact materials, for our four data sets and four fromthe literature. The results agree with a theory that takes into account spin-scattering within a magneticdomainwall.