1 23 Applied Physics B Lasers and Optics ISSN 0946-2171 Volume 111 Number 2 Appl. Phys. B (2013) 111:313-321 DOI 10.1007/s00340-013-5335-3 Optical and structural characterization of iron oxide and cobalt oxide thin films at 800 nm Hans A. Garcia, Ronaldo P. de Melo, Antonio Azevedo & Cid B. de Araújo