Abstract
Magnetoelectric (ME) composites consisting of piezoelectric materials and magnetostrictive materials have been studied extensively due to their large ME effects than those in single phases [1-2], offering promise for magnetic moment sensing and other applications. In these composites, the ME coefcient is dependent upon the elastic coupling that occurs at the interface between piezoelectric and magnetostrictive phases. Therefore, the interfacial coupling is a key factor that determines the ME response of layered composites. In fact, there is no ideal interfacial coupling for the classical strain mediated ME laminated composites, because they are usually constructed layer by layer through interface bonding with epoxy adhesive. This kind of non-ideal interface bonding can dampen the generated strain and mechanical quality factor, cause frequency shift, and also contribute to the noise oor and aging [3]. Recently, some studies have attempted to achieve ME responses, which are not inuenced by interfacial conditions. A stretching mechanically mediated structure of TbFe 2 / PZT/TbFe 2 with two nonmagnetic akes is designed to achieve the ME coupling by end bonding instead of interface bonding [4]. A ME heterostructure made by attaching magnetostrictive Metglas at the free ends of a PZT plate exhibits large ME response [5]. However, there are still too much interfacial contact exist, at least two end contacts. The influence of interfacial contact can be further decreased by new structure.
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