Giant 2-D Magnetoelectric Effects in a Unique Magnetostrictive/Piezoelectric Heterostructure Without Interface Bonding

We develop a unique magnetoelectric (ME) heterostructure with giant 2-D ME effects by attaching magnetostrictive Metglas at the free end of a piezoelectric Pb(Zr_1-xTi_x)O₃ (PZT) cantilever, instead of interface bonding. The ME effects originate from flexural deformation of PZT plate driven by a mechanical force from Metglas. In experiments, the 1-D ME heterostructures induced different directional magnetic fields have been designed optimally. When the length of Metglas ribbon is 12 mm, the 1-D ME heterostructures have the maximum ME effects. After assembling the different optimal designed 1-D ME heterostructures, an ME heterostructure with 2-D ME characteristics is obtained. The 2-D heterostructure has two resonant frequencies, at about 88 and 115 kHz. The maximum resonant voltage coefficient (α_ME,r) is 79 (V/cm Oe) when the heterostructure is in one direction of the magnetic field, and 45 (V/cm Oe) when the heterostructure is in the other direction of the magnetic field. The results demonstrate that this ME structure can be used as a multidimensional ME transducer.