Piezomagnetic losses in bilayered magnetostrictive/piezoelectric composites: Effect of Terfenol-D content on the magnetoelectric susceptibility

This letter reports on the influence of piezomagnetic loss in magnetostrictive Terfenol-D (TeD)/polyurethane composite layer/piezoelectric PZT ceramic layer laminates on the phase shift between magnetoelectric current and ac magnetic field versus bias dc field. For a given low measurement frequency (1 kHz), piezomagnetic losses are predominant when the amount of TeD powder embedded in polyurethane is small (2 vol.%), inducing an imaginary magnetoelectric susceptibility and a 0 degrees up to 180 degrees variation of phase shift of magnetoelectric current. When TeD content is high enough (7 vol.%), piezomagnetic losses are almost null, which yields a real magnetoelectric susceptibility and a -90 degrees up to +90 degrees variation of phase angle of the current. (C) 2009 Elsevier B.V. All rights reserved.