Agradecimentos: The authors are grateful F.L. Bernardes for fabrication of the samples. Experimental support of L.H.M. Antunes at Unicamp, Campinas in addition to Mr. L. Wu, Dr. F.E. Montoro and Dr. A.L. Gobbi (projects ME 22425 and LMF 20869) at Brazilian Nanotechnology National Laboratory-LNNano is acknowledged. The authors acknowledge the LNNano and the Brazilian Synchrotron Light Laboratory-LNLS for the use...