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

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

Buenos Aires

Congreso; At the Frontiers of Condensed Matter V; 2010

Centro Atómico Constituyentes - Comisión Nacional de Energía Atómic

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 con guration and (0001)Al3O4 substrate in BTO/BaM con guration, maintaining identical conditions of growth in both samples. Stoichiometric control of the plasma emission during the deposition of BTO and BaM lms was made by optic emission spectroscopy (OES). The structural characterization was achieved by X-ray difraction 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 magnetometer over a temperature range of the 5-300 K and for diferent magnetic feld applied. The dependence with temperature of the coercive eld and squareness (Sq = MR=MS) present strong influence with structural characteristic of BaM, besides, signi cant diferences were found between Sq(T) of BaM single phase and the squareness of BTO/BaM bilayer, both deposited on Al3O4, indicating the inuence of BTO layer.BaTiO3 (BTO) and barium ferrite, BaFe12O19 (BaM) were grown by Pulsed Laser Deposition, using (100)LaAlO3 substrate in the BaM/BTO con guration and (0001)Al3O4 substrate in BTO/BaM con guration, maintaining identical conditions of growth in both samples. Stoichiometric control of the plasma emission during the deposition of BTO and BaM lms was made by optic emission spectroscopy (OES). The structural characterization was achieved by X-ray difraction 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 magnetometer over a temperature range of the 5-300 K and for diferent magnetic feld applied. The dependence with temperature of the coercive eld and squareness (Sq = MR=MS) present strong influence with structural characteristic of BaM, besides, signi cant diferences were found between Sq(T) of BaM single phase and the squareness of BTO/BaM bilayer, both deposited on Al3O4, indicating the inuence of BTO layer.