Converse magnetoelectric effect dependence with CoFeB composition in ferromagnetic/piezoelectric composites

摘要

We report on the dependence of the converse magnetoelectric effect (CME) on the composition of Co_(60)Fe_(20)B_(20), Co_(43)Fe_(43)B_(14) and Co_(28)Fe_(52)B_(20) soft magnetic layers when coupled with PZT-micro-fiber-composites (MFC). In all cases we show strong CME responses, with squareness reduction of 60-80% when increasing the E-field from -1 to +1.4 MV/m. The highest CME response is found for Co_(43)Fe_(43)B_(14) which shows the largest ratio between the magnetostriction coefficient λ_s and the saturation magnetization M_s among the three compositions. According to the quasi-static magnetoelectric converse theory, the linear coupling factor α up to 1.65 μs/m and voltage coefficient M_(EH) up to 250 V·cm~(-1)·Oe~(-1) are calculated, which is 2-3 orders of magnitude higher than usually reported.