Leung Chung Ming, Or Siu Wing, Wang Feifei, Ho S L, Luo Haosu
Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, China.
Rev Sci Instrum. 2011 Jan;82(1):013903. doi: 10.1063/1.3529439.
We report an enhanced magnetoelectric (ME) effect in a heterostructure consisting of a long-type, longitudinally-longitudinally polarized 0.71Pb(Mg(1∕3)Nb(2∕3))O(3)-0.29PbTiO(3) (PMN-PT) piezoelectric single-crystal transformer with its input part sandwiched between two longitudinally magnetized Tb(0.3)Dy(0.7)Fe(1.92) (Terfenol-D) magnetostrictive alloy bars. The observed ME effect has two independent operational modes: namely, ME sensing mode and ME transduction mode. The ME sensing mode features a large ME voltage coefficient (α(V)) of ∼0.32 V∕Oe over a flat frequency range of 1-50 kHz, while the ME transduction mode possesses two colossal resonance α(V) of 7.6 and 7.9 V∕Oe, corresponding to the first and second longitudinal resonances, at 56.2 and 127.9 kHz, respectively. This enhanced dual-mode ME effect not only enables the application potential of the heterostructure, but also advances the technology of power-free ME sensors and transducers.
我们报道了一种由长型、纵向-纵向极化的0.71Pb(Mg(1∕3)Nb(2∕3))O(3)-0.29PbTiO(3)（PMN-PT）压电单晶变压器组成的异质结构中的增强磁电（ME）效应，其输入部分夹在两根纵向磁化的Tb(0.3)Dy(0.7)Fe(1.92)（Terfenol-D）磁致伸缩合金棒之间。观察到的ME效应有两种独立的工作模式：即ME传感模式和ME转换模式。ME传感模式的特点是在1-50 kHz的平坦频率范围内具有约0.32 V∕Oe的大ME电压系数（α(V)），而ME转换模式在56.2和127.9 kHz分别具有7.6和7.9 V∕Oe的两个巨大共振α(V)，对应于第一和第二纵向共振。这种增强的双模ME效应不仅实现了异质结构的应用潜力，还推动了无电源ME传感器和换能器技术的发展。
