Semiclassical theory of spin-polarized shot noise in mesoscopic diffusive conductors

Abstract

We study fluctuations of spin-polarized currents in a three-terminal spin-valve system consisting of a diffusive normal metal wire connected by tunnel junctions to three ferromagnetic terminals. Based on a spin-dependent Boltzmann-Langevin equation, we develop a semiclassical theory of charge and spin currents and the correlations of the currents fluctuations. In the three terminal system, we show that current fluctuations are strongly affected by the spin-flip scattering in the normal metal and the spin polarizations of the terminals, which may point in different directions. We analyze the dependence of the shot noise and the cross-correlations on the spin-flip scattering rate in the full range of the spin polarizations and for different magnetic configurations. Our result demonstrate that noise measurements in multi-terminal devices allow to determine the spin-flip scattering rate by changing the polarizations of ferromagnetic terminals.

12 pages, 5 figures

References in corpus (5)

• Positive cross-correlations due to Dynamical Channel-Blockade in a three-terminal quantum dot
• Dynamical Spin-Blockade in a quantum dot with paramagnetic leads
• Shot noise in a diffusive F-N-F spin valve
• Spin-Flip Noise in a Multi-Terminal Spin-Valve
• Spin detection in quantum dots by electric currents

Cited by in corpus (10)

• Spin-polarized current and shot noise in the presence of spin flip in a quantum dot via nonequilibrium Green's functions
• Noise and dissipation in magnetoelectronic nanostructures
• What can we learn about the dynamics of transported spins by measuring shot noise in spin-orbit-coupled nanostructures?
• Enhanced Spin Dependent Shot Noise in Magnetic Tunnel Barriers
• Current fluctuations in a spin filter with paramagnetic impurities
• Spin-Current Shot Noise in Mesoscopic Conductors
• Shot noise in diffusive ferromagnetic metals
• Magneto shot noise in noncollinear diffusive spin-valves
• Quantum Spin Tomography in Ferromagnet-Normal Conductors
• Shot noise of a ferromagnetic nanowire with a domain wall