Magnetoelectronics is mainly digital, i.e. governed by up and downmagnetizations. In contrast, analogue magnetoelectronics makes use of phenomenaoccuring for non-collinear magnetization configurations. Here we reviewtheories which have recently been applied to the transport in non-collinearmagnetic nanostructures in two and multiterminal structures, viz. random matrixand circuit theory. Both are not valid for highly transparent systems in aresistive environment like perpendicular metallic spin valves. The solution tothis problem is a renormalization of the conventional and spin-mixingconductance parameters.
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