Growth of Ba-titanate and Ba-hexaferrite bilayers: effect of BTO layer in magnetic properties of BaM phase

C. I. ZANDALAZINI; M. I. OLIVA; J. C. FERRERO

Congreso; At the Frontiers of Condensed Matter V; 2010

Bilayers of barium titanate, BaTiO3 (BTO) and barium ferrite, BaFe12O19 (BaM) were grown by Pulsed Laser Deposition, using (100)LaAlO3 substrate in the BaM/BTO configuration and (0001)Al3O4 substrate in BTO/BaM configuration, maintaining identical conditions of growth in both samples. Stoichiometric control of the plasma emis- sion during the deposition of BTO and BaM films was made by optic emission spectroscopy (OES). The structural characterization was achieved by X- ray diffraction and preferential growth it was found for the BTO phase in the BaM/BTO bilayer, and for BaM phase in the BTO/BaM bilayer. The magnetic properties of BaM phase was studied by SQUID mag- netometer over a temperature range of the 5-300K and for different magnetic field applied. The dependence with temperature of the coercive field and squareness (Sq = MR/MS) present strong influence with struc- tural characteristic of BaM, besides, significant differ- ences were found between Sq(T) of BaM single phase and the squareness of BTO/BaM bilayer, both de- posited on Al3O4, indicating the influence of BTO layer.