  We consider fluctuation relations between the transport coefficients of a
spintronic system where magnetic interactions play a crucial role. We
investigate a prototypical spintronic device (a spin-diode) which consists of
an interacting resonant level coupled to two ferromagnetic electrodes. We
thereby obtain the cumulant generating function for the spin transport in the
sequential tunnelling regime. We demonstrate the fulfilment of the nonlinear
fluctuation relations when up and down spin currents are correlated in the
presence of both spin-flip processes and external magnetic fields.
