Coulomb Promotion of Spin-Dependent Tunnelling
  We study transport of spin-polarized electrons through a magnetic single-electron transistor (SET) in the presence of an external magnetic field. Assuming the SET to have a nanometer size central island with a single electron level we find that the interplay on the island between coherent spin-flip dynamics and Coulomb interactions can make the Coulomb correlations promote rather than suppress the current through the device. We find the criteria for this new phenomenon -- Coulomb promotion of spin-dependent tunnelling -- to occur. 
L.Y. Gorelik, S.I. Kulinich, R.I. Shekhter, M. Jonson, and V.M.   Vinokur