Enhancement of piezomagnetic response of highly magnetostrictive rare earth-iron alloys at kHz frequencies

Abstract

The effects of Al and Si additions on the frequency response of highly magnetostrictive Tb–Dy–Fe alloys have been studied. These elements reduced the electrical conductivity of the material, thereby increasing the depth of penetration of ac magnetic fields and extending the operational frequency range. Complex permeability measurements were made on doped and undoped polycrystalline samples with the objective of studying the improvement in energy conversion efficiency at kilohertz frequencies as a result of the alloying additions. The resulting complex permeability was compared with the values for single crystal specimens of Tb_0.3Dy_0.7Fe_1.92 at a range of frequencies from 10 Hz to 50 kHz.