Magnetoelectric Effect of Fe 70 Pd 30 Ferromagnetic Shape Memory Alloy Film: Lead Zirconate Titanate Trilayer Composites at Low and High Magnetic Field Frequencies

Magnetoelectric (ME) coupling in multiferroic composites of Fe 70 Pd 30 /lead zirconate titanate (PZT)/Fe 70 Pd 30 trilayers was investigated. An Fe 70 Pd 30 ribbon and Fe 70 Pd 30 films were prepared by rapid solidification and sputtering techniques, respectively. The saturated value of magnetostriction of the ribbon 30 µm in thickness was 95 ppm at a steady magnetic field of 200 Oe. Those of the films were 22 to 67 ppm depending on the film thickness. The output ME voltage V ME of the trilayer composites, which was measured at a driving ac magnetic field H ac at 1 Hz, increased with increasing magnetostriction. The V ME of the ribbon/PZT/ribbon composite exhibited a very large peak at a resonant frequency of 64 kHz and responded to an H ac of 0.0025 Oe. However, for the film/PZT/film composite, V ME linearly increased with increasing H ac in a wide frequency range of 1 to 10 4 Hz.