Optical and electrical characterization of Ni-doped orthoferrites thin films prepared by sol-gel processFeroz Ahmad Mir, Javid A. Banday, Christian Chong, Pierre Dahoo and Fayaz A. NajarEur. Phys. J. Appl. Phys., 61 1 (2013) 10302DOI: https://doi.org/10.1051/epjap/2012120329