Enhanced Resonance Magnetoelectric Coupling in (1-1) Connectivity Composites

Bulk-magnetoelectric (ME) composites consisting of various piezoelectric and piezomagnetic materials with (3-0), (3-1), (2-2), and (2-1) connectivity are proposed in a bid to realize strong ME coupling for next-generation electronic-device applications. Here, 1D (1-1) connectivity ME composites consisting of a [011]-oriented Pb(Mg,Nb)O-3-PbTiO3 (PMN-PT) single-crystal fiber laminated with laser-treated amorphous FeBSi alloy (Metglas) and operating in L-T mode (longitudinally magnetized and transversely poled) are reported, which exhibit an enhanced resonant ME coupling coefficient of approximate to 7000Vcm(-1) Oe(-1), which is nearly seven times higher than the best result published previously, and also a superhigh magnetic sensitivity of 1.35 x 10(-13) T (directly detected) at resonance at room temperature, representing a significant advance in bulk magnetoelectric materials. The theoretical analyses based on magnetic-circuit and equivalent-circuit methods show that the enhancement in ME coupling can be attributed to the reduction in resonance loss of laser-treated Metglas alloy due to nanocrystallization and the strong magnetic-flux-concentration effect in (1-1) configuration composites.National Natural Science Foundation of China [51132001, 51072003]; Beijing Municipal Science and Technology Projects [Z131100003213020, Z151100003715003]SCI(E)ARTICLE192