1. Instituto de Cerámica y Vidrio; CSIC; Calle Kelsen 5 Madrid 28049 Spain
2. Center for Materials Crystallography; Department of Chemistry and iNANO; Langelandsgade 140 DK-8000 Aarhus C Denmark
3. INSTM and Università degli Studi di Firenze; I-50019 Sesto Fiorentino (Firenze) Italy
4. General Numerics Research Lab; Moritz-von-Rohr-Strasse 1a D-07745 Jena Germany
5. IMDEA Nanociencia; Calle Faraday, 9 Madrid 28049 Spain
6. Instituto de Magnetismo Aplicado; Carretera A-6 km 22.5, P.O. Box 155 Las Rozas Madrid 28230 Spain
7. CNR-IMEM; PR 43124 Parma Italy