‘‘Field-dependent interface resistance’’ of Ag/Co multilayers

For Ag thicknesses large enough to magnetically decouple the Co layers, the resistances in magnetic field of a series of Ag/Co multilayers with the current flowing perpendicular to the layer plane are consistent with a simple series summation of resistances due to the Ag and Co layers plus an ``interface resistance'', R₀₆-₂₎ (H), that depends upon the relative orientations of the magnetizations in neighboring ferromagnetic layers in different magnetic fields, H. The resulting Co resistivity is weakly field dependent, and R₀₆-₂₎ (H) is strongly field dependent: AR₀₆-₂₎ (H), where A is the sample area, decreases from 0. 6 f m^2 at the initial field H₀=0, to 0. 2 f m^2 at the saturation field, Hₒ.