Abstract
Theories for magnetoelectric (ME) effects in a bilayer consisting of magnetostrictive film onpiezoelectric substrate are discussed. The ME coupling at low frequencies and atmechanical resonance due to acoustic modes have been estimated and applied to thespecific case of a thin film of permendur or nickel ferrite on lead zirconate titanate (PZT).Both ideal and non-ideal interface coupling are considered. The theory predicts strongME coupling for magnetic films on piezoelectric substrates. At low frequency,the ME coefficient is maximum when PZT is 2–4 times as thick as the magneticfilm. The ME coefficient, for ideal coupling, shows resonance enhancement at asingle frequency. For non-ideal interface coupling, enhancement is expected at twofrequencies corresponding to coupled oscillations in magnetic and piezoelectriclayers.
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