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We study the spin-resolved transport through single-level quantum dotsstrongly coupled to ferromagnetic leads in the Kondo regime, with a focus oncontact and material asymmetry-related effects. By using the numericalrenormalization group method, we analyze the dependence of relevant spectralfunctions, linear conductance and tunnel magnetoresistance on the systemasymmetry parameters. In the parallel magnetic configuration of the device theKondo effect is generally suppressed due to the presence of exchange field,irrespective of system's asymmetry. In the antiparallel configuration, on theother hand, the Kondo effect can develop if the system is symmetric. We showthat even relatively weak asymmetry may lead to the suppression of the Kondoresonance in the antiparallel configuration and thus give rise to nontrivialbehavior of the tunnel magnetoresistance. In addition, by using thesecond-order perturbation theory we derive general formulas for the exchangefield in both magnetic configurations of the system.

Asymmetry-induced effects in Kondo quantum dots coupled to ferromagnetic leads