Abstract

In the present article, we study the spin-dependent thermoelectric properties of a quantum dot connected to two ferromagnetic contacts. We obtain results for the conductance, thermopower, thermal conductance, Lorentz ratio and figure of merit. The transmission probability shows antiresonances as a function of the energy due to the quantum interference effects. It results in a violation of the Wiedemann-Franz law which produces an improvement of the spin-dependent thermopower and the merit figure of the system. This set up can be used to design new spin-dependent thermoelectric devices with high efficiencies.