Andreev drag effect in ferromagnetic-normal-superconducting systems
David Sánchez, Rosa López, Peter Samuelsson, Markus Büttiker
DOI 10.1103/PhysRevB.68.214501 · Physical Review B
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Abstract
We investigate conductances and current correlations in a system consisting of a normal multichannel conductor connected to one superconducting and two ferromagnetic electrodes. For antiparallel orientation of the ferromagnet polarizations, current injection from one ferromagnet can, due to Andreev reflection, lead to a net drag of current from the second ferromagnet toward the superconductor. We present the conditions for the Andreev drag in terms of lead polarizations, contact conductances, and spin-flip scattering. Remarkably, both equilibrium and nonequilibrium zero-frequency current correlations between the ferromagnets become positive even in the presence of spin relaxation.
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