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We investigate the effects induced by spin polarization in the contactsattached to a serial double quantum dot. The polarization generates effectivemagnetic fields and suppresses the Kondo effect in each dot. The super-exchangeinteraction ($J_{\mathrm{AFM}}$), tuned by the inter-dot tunnelling rate $t$,can be used to compensate the effective fields and restore the Kondo resonancewhen the contact polarizations are aligned. As a consequence, the direction ofthe spin conductance can be controlled and even reversed using electrostaticgates alone. Furthermore, we study the associated two-impurity Kondo model andshow that a ferromagnetic exchange coupling ($J_{\mathrm{FM}}$) leads to aneffective spin-1 exchange-anisotropic Kondo model which exhibits a quantumphase transition in the presence of partially polarized contacts.

Tunable Kondo effect in double quantum dots coupled to ferromagnetic contacts