‘‘Field-dependent interface resistance’’ of Ag/Co multilayers
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Abstract
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'', ${\mathit{R}}_{\mathrm{Ag}\mathrm{\ensuremath{-}}\mathrm{Co}}$(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 ${\mathit{R}}_{\mathrm{Ag}\mathrm{\ensuremath{-}}\mathrm{Co}}$(H) is strongly field dependent: ${\mathit{AR}}_{\mathrm{Ag}\mathrm{\ensuremath{-}}\mathrm{Co}}$(H), where A is the sample area, decreases from \ensuremath{\approxeq}0.6 f\ensuremath{\Omega} ${\mathrm{m}}^{2}$ at the initial field ${\mathit{H}}_{0}$=0, to \ensuremath{\approxeq}0.2 f\ensuremath{\Omega} ${\mathrm{m}}^{2}$ at the saturation field, ${\mathit{H}}_{\mathit{s}}$.
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