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.

PHYSICA B - CONDENSED MATTER

ELSEVIER SCIENCE BV

Año: 2010

0921-4526

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 onn 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 diraction 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 dierent magnetic field applied. The dependence with temperature of the coercive eld and squareness (Sq = MR=MS) present strong influence with structural characteristic of BaM, besides, significant differences were found between Sq(T) of BaM single phase and the squareness of BTO/BaM bilayer, both deposited on Al3O4, indicating the influence 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 onn 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 diraction 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 dierent magnetic field applied. The dependence with temperature of the coercive eld and squareness (Sq = MR=MS) present strong influence with structural characteristic of BaM, besides, significant differences were found between Sq(T) of BaM single phase and the squareness of BTO/BaM bilayer, both deposited on Al3O4, indicating the influence of BTO layer.