Radio Frequency Magnetoelectric Effect Measured at High Temperature

Magnetoelectric response at the radio frequency range has been studied as a function of temperature. For that purpose, we have fabricated sandwich-type laminated composites in which the Fe 61.6 Co 16.4 Si 10.8 B 11.2 alloy was used as the magnetostrictive element and polyvinylidene fluoride (PVDF) as the piezoelectric one. The Fe 61.6 Co 16.4 Si 10.8 B 11.2 amorphous ribbon shows good magnetic properties, with a magnetostriction close to 30 ppm and a piezomagnetic coefficient in as-quenched state and for a long ribbon of ${21.4 \times 10^{-3}}$ ppm/Am $^{{ -1}}$ . Even though PVDF shows a higher piezoelectric coefficient ( ${d} _{{33}}={{15}}$ pC/N) than the high temperature poly and copolymides, the advantage of using these poly- and copolymides is the great stability shown at temperatures close to 200 °C. Considering this, the influence of temperature in laminated composites and in their components (epoxy, piezoelectric, and magnetostrictive constituents) has been measured and discussed.