1. CNR - ISMN, Consiglio Nazionale delle Ricerche - Istituto per lo Studio dei Materiali Nanostrutturati, v. Gobetti 101, 40129 Bologna, Italy
2. Instituto de Tecnología de Materiales, Universitat Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain
3. Scottish Universities Physics Alliance, School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
4. University of California, Santa Barbara, Electrical & Computer Engineering Harold Frank Hall, Santa Barbara, CA 93106-9560, USA
5. Institut für Physik, Universität Halle, 06120 Halle, Germany
6. Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther University Halle-Wittenberg, Nanotechnikum Weinberg, 06120 Halle, Germany
7. Centro Ricerche Fiat, 10043, Orbassano, Torino, Italy