Anisotropic ferromagnetism induced in rutile single crystals by Co implantation J. V. Pinto, M. M. Cruz, R. C. da Silva, N. Franco, A. Casaca, E. Alves and M. Godinho Eur. Phys. J. B, 55 3 (2007) 253-260 Published online: 21 February 2007 DOI: 10.1140/epjb/e2007-00054-2