Low-field colossal magnetoresistance in manganite tunnel spin valves M. Viret, M. Drouet, J. Nassar, J. P. Contour, C. Fermon and A. Fert Europhys. Lett., 39 5 (1997) 545-550 Published online: 01 September 2002 DOI: 10.1209/epl/i1997-00391-2