Immense tunnel magnetoresistance mediated by Coulomb blockade effect and   current-driven magnetization reversal in Co clusters embedded in a TiO2   matrix
  This article was withdrawn by the authors due to misinterpretation of experimental data. 
J. Varalda, D. H. Mosca, Y.-L. Zheng, A. J. A. de Oliveira, M.   Marangolo, W. A. Ortiz, D. Demaille, B.Vodungbo and V. H. E...