Fe-Ga/Pb (Mg 1/3 Nb 2/3) O3 -PbTiO 3 magnetoelectric laminate composites

Abstract

We have found large magnetoelectric (ME) effects in long-type laminate composites of Fe-20%Ga magnetostrictive alloys and piezoelectric Pb (Mg13 Nb23) O3 -PbTi O3 single crystals. At lower frequencies, the ME voltage coefficient of a laminate with longitudinally magnetized and longitudinally polarized (i.e., L-L mode) layers was 1.41 VOe (or 1.01 Vcm Oe). Near the natural resonant frequency (∼91 kHz) of the laminate, the ME voltage coefficients were found to be dramatically increased to 50.7 VOe (36.2 Vcm Oe) for the L-L mode. In addition, the laminate can detect a minute magnetic field as low as ∼2× 10-12 T at resonance frequency, and ∼1× 10-10 T at lower frequencies. © 2005 American Institute of Physics.