Orientation dependence of magnetoelectric coefficient in rhombohedral Pb(Zr0.6Ti0.4)O3-cubic CoFe2O4 composite. (1st February 2019) - Jian, Gang
Abstract: In this study, orientation dependences of magnetoelectric coefficient α E33 along arbitrary directions were investigated in 3 m Pb(Zr0.6 Ti0.4 )O3 (PZT60/40) - m 3 m CoFe2 O4 (CFO) composites with 2–2, 1–3 pm, and 1–3 m / p connectivities using coordinate transformation method. Orientation dependences of parameters of elastic, dielectric, piezoelectric, permeability, and piezomagnetic properties for PZT60/40 and CFO were investigated independently to finally obtain anisotropy characteristics of the magnetoelectric coefficient of composites. Orientation dependence of α E33 in composites is found mainly determined by that of d 31 and e 31 of PZT60/40 and q 31 of CFO for all three investigated connectivities. The greatly enhanced α E33 ' of composites along specific orientations of piezoelectric/magnetostrictive phases were presented, which lies in: PZT60/40 ∣∣ [100] - CFO ∣∣ [001] combination for 2–2 laminate ( f = 0.43, α E33 = 81 mV cm −1 Oe), PZT60/40 ∣∣ [001] - CFO ∣∣ [001] combination for both 1–3 p/m ( f = 0.6, α E33 = 125 mV cm −1 Oe) and 1–3 m / p fiber composites ( f = 0.6, α E33 = 121 mV cm −1 Oe). Volume fraction f max is found unchanged when various orientations of piezoelectric or magnetic phases were applied. The results suggest that the magnetoelectric coefficient of multiferroic composites with various connectivities could be significantly enhanced by adopting specific orientations.