Spin transport properties of a quantum dot coupled to ferromagnetic leads with noncollinear magnetizations

Abstract

A correct general formula for the spin current through an interacting quantum dot coupled to ferromagnetic leads with magnetization at an arbitrary angle $\theta$ is derived within the framework of the Keldysh formalism. Under asymmetric conditions, the spin current component J_{z} may change sign for $0<\theta <\pi$. It is shown that the spin current and spin tunneling magnetoresistance exhibit different angle dependence in the free and Coulomb blockade regimes. In the latter case, the competition of spin precession and the spin-valve effect could lead to an anomaly in the angle dependence of the spin current.

7 pages, 4 figures; some parts of the text has been revised in this version accepted by J. Phys.: Condens. Matter

References in corpus (10)

• Dissipationless Quantum Spin Current at Room Temperature
• Direct electronic measurement of the spin Hall effect
• Kondo effect in quantum dots coupled to ferromagnetic leads
• NRG study of the Kondo effect in the presence of itinerant-electron ferromagnetism
• Kondo effect in a semiconductor quantum dot coupled to ferromagnetic electrodes
• Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green's functions
• Nonequilibrium Kondo Effect in a Quantum Dot Coupled to Ferromagnetic Leads
• Spin Current and Current-Induced Spin Transfer Torque in Ferromagnet-Quantum Dot-Ferromagnet Coupled Systems
• Magnetoresistance of a quantum dot with spin-active interfaces
• Kondo effect with non collinear polarized leads: a numerical renormalization group analysis

Cited by in corpus (1)

• Two-orbital Kondo effect in quantum dot coupled to ferromagnetic leads