Author(s)

S. D. Patil¹, K. Y. Rajpure¹, A. M. Shaikh²

¹Shivaji University, Kolhapur, India.
²New College, Kolhapur, India.

We report the magnetoelectric (ME) coupling in ME composites composed of NiFe₂O₄ (NFO) or metglas as magnetostrictive phases and BaTiO₃ (BTO) as piezoelectric phase, targeting lead free magetnic field sensors. NFO and BTO phases were synthesized by solid state sintering method and further characterized by using XRD and FESEM techniques. The P-E hysteresis curve shows good ferroelectric behavior with saturation polarization of P_s = 15.87 C/cm² and coercive electric field of 130 kV/cm. The ME response was characterized as a function of dc magnetic field at a fixed frequency. The transverse ME voltage coefficient, αME31 shows 2 times larger magnitude than that of longitudinal ME voltage coefficient, α_ME31. The maximum α_ME31 of 37 mV/cm•Oe (@H_dc = 250 Oe) is observed for NFO/BTO/NFO ME composites with thickness ratio of t_m/t_p = 1.0. The ME coupling is further enhanced by replacing NFO layers by highly magnetostrictive metglas layers. Metglas/BTO/metglas laminates show large α_ME31 value of 81 mV/cm•Oe at relatively lower H_dc of 145 Oe. The present laminates can offer promising opportunities of engineering environmental friendly ME laminate for applications in ME devices such as energy harvester and magnetic field sensors.

Ferroelectrics, Magnetostriction, Mechanical Properties, Piezoelectricity, Strain

Patil, S. , Rajpure, K. and Shaikh, A. (2016) Magnetoelectric Coupling in Metglas/BaTiO₃/Metglas Lead-Free Magnetoelectric Composites. Journal of Materials Science and Chemical Engineering, 4, 1-7. doi: 10.4236/msce.2016.48001.