Non-universal shot noise in quasiequilibrium spin valves

Abstract

We show that the breakdown of the Wiedemann-Franz law due to electron--electron scattering in diffusive spin valves may result in a strong suppression of the Fano factor that describes the ratio between shot noise and average current. In the parallel configuration of magnetizations, we find the universal value $\sqrt{3}/4$ in the absence of a normal-metal spacer layer, but including the spacer leads to a non-monotonous suppression of this value before reaching back to the universal value for large spacer lengths. On the other hand, in the case of an antiparallel configuration with a negligibly small spacer, the Fano factor is $\sqrt{3(1-P^2)}/4$, where $P$ denotes the polarization of the conductivities. For $P\to \pm 1$, the current through the system is almost noiseless.

5+ pages, 5 figures, including a short appendix

References in corpus (8)

• Spin Caloritronics
• Thermal Spin-Transfer Torques in Magnetoelectronic Devices
• Hot electron cooling by acoustic phonons in graphene
• Shot noise in a diffusive F-N-F spin valve
• Spin-Flip Noise in a Multi-Terminal Spin-Valve
• Energy relaxation in the spin-polarized disordered electron liquid
• Electron-electron interaction induced spin thermalization in quasi-low-dimensional spin valves
• Magneto shot noise in noncollinear diffusive spin-valves

Cited by in corpus (1)

• Current noise generated by spin imbalance in presence of spin relaxation