Magnetoelectric Effect of Fe_(70)Pd_(30) Ferromagnetic Shape Memory Alloy Film:Lead Zirconate Titanate Trilayer Composites at Low and High Magnetic Field Frequencies

摘要

Magnetoetectric (ME) coupling in multiferroic composites of Fe_(70)Pd_(30)/lead zirconale titanate (PZT)/Fe_(70)Pd_(30) trilayers was investigated. An Fe_(70)Pd_(3O) 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 μrn in thickness was 95ppm at a steady magnetic field of 200 Oe. Those of the films were 22 to 67ppm 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.