1. Laboratory of Nanostructured Multifunctional Materials, Department of Physics, Federal University of Sao Carlos, UFSCar, Sao Carlos, Brazil 13565-905
2. Aix Marseille Université, Université de Toulon, CNRS, IM2NP, Marseille, France 13013
3. University of Sao Paulo−USP, Sao Carlos, SP, Brazil 13566-590
4. Laboratorio Microscopias Avanzadas, Instituto de Nanosciencia de Aragon, Universidad de Zaragoza, 50018 Zaragoza, Spain
5. ARAID, 50018 Zaragoza, Spain
6. Instituto de Ciencias de Materiales Aragon, CSIC-U. Zaragoza, 50009 Zaragoza, Spain