Abstract
We study the temperature dependence of the linear conductance and tunnel magnetoresistance of quantum dots coupled to ferromagnetic leads. Using the numerical renormalization group method, we determine transport properties for a wide range of temperatures $T$, ranging from zero through the Kondo temperature ${T}_{K}$ up to the high-temperature regime. We show that tunnel magnetoresistance in the local moment regime displays a nonmonotonic dependence on $T$ and vanishes when $T~{T}_{K}$. In addition, we also analyze the spin polarization $\mathcal{P}$ of the linear conductance in the parallel configuration and show that $\mathcal{P}$ is suppressed in the odd electron Coulomb blockade valley and can be enhanced above the spin polarization of the leads in the even Coulomb valley.
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