Title :
Improved magnetoelectric effect in modified (Na0.5Bi0.5)TiO3-BaTiO3-CoFe2O4 lead-free multiferroic composites
Author :
Ramana, E. Venkata ; Graça, M. P F ; Monteiro, J. ; Mendiratta, S.K. ; Valente, M.A.
Author_Institution :
Dept. of Phys., Univ. of Aveiro, Aveiro, Portugal
Abstract :
Particulate composites of (Na0.5Bi0.5TiO3)-BaTiO3(NBBT)+(Co0.6Zn0.4)(Fe1.7Mn0.3)O4 (CZFMO) were synthesized by the conventional ceramic method to study ferroelectric, magnetic and magnetoelectric properties. Ferroelectric switching has been seen in all the ferroelectric and composite ceramics. Remanent polarization of 34 and 26μC/cm2 was obtained for the pure and 85 mol% NBT-BT ceramics, while a larger leakage current was observed for the remaining composites. The magnetoelectric coefficient (αME) of 8 mV/cm-Oe was observed in the composition with 65 mol% ferroelectric and the coupling seems to be lower for higher ferroelectric content ceramics. A change of ~10% in saturated magnetization was observed in composites of 65 mol% NBBT, which is an indication of the converse magnetoelectric effect. The results indicate that these lead-free composites are promising and can be tunable for the low-field magnetoelectric applications.
Keywords :
barium compounds; bismuth compounds; cobalt compounds; composite materials; dielectric polarisation; ferroelectric ceramics; ferroelectric switching; leakage currents; magnetoelectric effects; materials preparation; multiferroics; remanence; sodium compounds; (Na0.5Bi0.5)TiO3-BaTiO3-CoFe2O4; composite ceramics; conventional ceramic method; converse magnetoelectric effect; ferroelectric ceramics; ferroelectric properties; ferroelectric switching; lead-free multiferroic composites; leakage current; low-field magnetoelectric applications; magnetic properties; magnetoelectric coefficient; magnetoelectric properties; remanent polarization; saturated magnetization; Ceramics; Ferrites; Magnetic hysteresis; Magnetoelectric effects; Magnetostriction; Perpendicular magnetic anisotropy; Magnetoelectric composites; ferroelectric; ferromagnetic; polarization;
Conference_Titel :
Applications of Ferroelectrics held jointly with 2012 European Conference on the Applications of Polar Dielectrics and 2012 International Symp Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials (ISAF/ECAPD/PFM), 2012 Intl Symp
Conference_Location :
Aveiro
Print_ISBN :
978-1-4673-2668-1
DOI :
10.1109/ISAF.2012.6297834
