Magnetoelectric effect in transition-metal-doped BaTiO3-Tb1-xDyxFe2-y bilayer

1.0 mol% Mn(Cr,Co)-doped BaTiO3 have been synthesized with sol-gel technique. The doped BaTiO3 were found to have tetragonal structure at room temperature. The phase transition temperatures and the latent heat of ferroelectric to paraelectric transition were observed to decrease with Cr, Mn and Co doping in BaTiO3. Magnetic characterizations including magnetostriction and magnetization were performed for Tb1-xDyxFe2-y(TDF). Bonded bilayer composites Cr∶BTO-TDF, Mn∶BTO-TDF and Co:BTO-TDF have been fabricated and the transverse ME effect of the three bilayers have been investigated. The maximum transverse ME voltage coefficients for Cr∶BTO-TDF bilayer can reach 586mV·cm-1·(80 A·m-1)-1 under a bias magnetic field of 340×80 A·m-1, and that for Mn∶BTO-TDF and Co:BTO-TDF are 480 mV·cm-1·(80 A·m-1)-1 and 445 mV·cm-1·(80 A·m-1)-1 under a bias magnetic field of about 400×80 A·m-1, respectively.