Spin Transport in a Double Magnetic Tunnel Junction Quantum Dot System With Noncollinear Magnetization

A model is proposed to study the spin dependent transport of a quantum dot coupled to two noncollinear ferromagnetic leads configuration, in the sequential tunneling regime. The angular deviation (thetas) and lead polarization (p) dependence of the tunneling current and tunneling magnetoresistance (TMR) are investigated for both singly occupied and doubly occupied dot, in the presence of spin flip effect. The current and TMR are found to be more sensitive to p and the spin flip rate in the singly-occupied bias regime.