Scattering theory of magnetic/superconducting junctions with spin-active interfaces
F. Romeo, R. Citro
DOI 10.1103/PhysRevB.84.024531 · Physical Review B
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Abstract
We formulate a generalized scattering field theory à la Büttiker describing particles transport in magnetic/superconducting heterostructures. The proposed formalism, characterized by a four-component spinorial wavefunction of the Bogoliubov de Gennes theory, allows to describe the spin flipping phenomena induced by noncollinear magnetizations in the scattering region. As a specific application of the theory, we analyze the conductance, the magnetoresistance, and the generation of spin-torque produced by an applied voltage in a spin-valve system. Quantum size effects and quantum beating patterns both in the conductance and in the spin-torque are carefully described.
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