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.
Scattering theory of magnetic/superconducting junctions with spin-active interfaces
ROMEO, FRANCESCO;CITRO, Roberta
2011
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
