1ST EVIDENCE OF INTERFACIAL MAGNETIC ROUGHNESS IN FE CR ARTIFICIAL MULTILAYER STUDIED BY NEUTRON-DIFFRACTION MEASUREMENT/

We have investigated Fe/Cr artificial multilayers to elucidate the ori gin of a giant magnetoresistance effect (GMR), by neutron scattering m easurement in external magnetic fields up to 0.8 Tesla. Intense diffus e scattering appears around the superlattice reflection corresponding to the antiferromagnetic Fe layer stacking. The magnetic diffuse scatt ering intensity decreases drastically in magnetic fields, which strong ly suggests that the GMR effect in this system is dominated by the app earance of magnetic disorder at the interface between the Fe and the C r layers.