Fe – Ga ∕ Pb ( Mg 1 ∕ 3 Nb 2 ∕ 3 ) O 3 – Pb Ti O 3 magnetoelectric laminate composites

We have found large magnetoelectric (ME) effects in long-type laminate composites of Fe–20%Ga magnetostrictive alloys and piezoelectric Pb(Mg1∕3Nb2∕3)O3–PbTiO3 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 1.41V∕Oe (or 1.01V∕cmOe). Near the natural resonant frequency (∼91kHz) of the laminate, the ME voltage coefficients were found to be dramatically increased to 50.7V∕Oe (36.2V∕cmOe) for the L-L mode. In addition, the laminate can detect a minute magnetic field as low as ∼2×10−12T at resonance frequency, and ∼1×10−10T at lower frequencies.