Composite Magnetoelectric Transducer of Terfenol-D and Pb(Zr,Ti)O$_{3}$ Plates Bonded on an Elastic Substrate

The megnetoelectric (ME) effect of magnetostrictive Terfenol-D (Tb
<sub>1

-

x</sub>
Dy
_x
Fe
<sub>2

-

y</sub>
) and piezoelectric Pb(Zr,Ti)O
₃
plates bonded on a beryllium bronze substrate is reported. The substrate severs as a frequency determining element and dominates the quality factor (
Q

_m
) of the oscillator. The device can be regarded as a driven damped system. Its resonance occurs at multimodes where the Terfenol-D plate oscillates at frequencies near the allowed frequencies of the substrate, producing a much greater response to finite AC magnetic field input. The theoretical analysis demonstrates that the ME voltage coefficient (alpha
_ME
) is directly proportional to the factor of gamma =
Q

_m

k

_eff

²
/(1 -
k

_eff

²
), where
k

_eff
is the effective electromechanical coupling factor. The experimental results show that: (i) there are multiple ME response peaks; (ii) the alpha
_ME
and
Qm
are higher than those of the previous reported laminate composites of Terfenol-D and Pb(Zr,Ti)O
₃
plates only; and (iii) the factor of gamma is enhanced by the introduction of elastic substrate and the enhancement of alpha
_ME
is originated from the increase of the factor of gamma .