1. National Nanotechnology Laboratory of CNR-INFM, Unità di Ricerca IIT, Distretto Tecnologico ISUFI, via per Arnesano km 5, 73100 Lecce, Italy, CEMES-CNRS, 29 rue Jeanne Marvig, B.P. 94347, F-31055 Toulouse Cedex, France, Institute of Applied Magnetism and Department of Materials Physics, UCM, P.O. Box 155, 28230 Las Rozas, Madrid, Spain, Istituto di Cristallografia, Consiglio Nazionale delle Ricerche, via Amendola 122/O, 70126 Bari, Italy, Laboratory for Neutron Scattering, ETH Zurich and PSI Villigen, CH...