Magnetoelectric Effect in Ring-Shaped FeGa/BaTiO3 Composites

Polycrystal FeGa alloy rods were prepared by vacuum induction melting furnace. Magnetostrictive behavior has been measured by using standard strain gauges. Ring-shaped composites FeGa/ BaTiO3 were fabricated by bonding the ring-type discs of the BaTiO3 and FeGa. The magnetoelectric (ME) effect have been characterized. Near the natural resonant frequency (∼61.5kHz) for the composites, the ME effect were found to be dramatically increased, 8-10 higher than the properties in low frequency. The ME voltage varied evidently with magnetic bias and there existed an optimized magnetic bias 260 Oe. When the magnetic bias varied between 160Oe ∼ 260Oe the ME voltage of the composites changed a little and kept on a high value. A linear coupling between the measured ME coefficient and Hac for composites was observed.