Converse magnetoelectric effects on heterotype electrostrain-piezopermeability composites

By using the product effect of electrostrain and piezopermeability, a heterotype composite consisting of a bar of Pb(Zr, Ti)O-3 and a ring of MnZn ferrite with higher permeability has been developed, and its converse magnetoelectric effect has been investigated. Under a constant electric field of 5 kV/cm, about 20% electric-field-induced changes in permeability and impedance have been observed with the composite device over a wide frequency band. The electric-field dependence of the permeability and impedance shows a ferroelectric relaxation behavior. This composite is a candidate material for electrically controlled magnetic devices. (C) 2008 American Institute of Physics.