| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 739333 | Sensors and Actuators A: Physical | 2014 | 7 Pages |
•We propose a self-biased high-sensitivity magnetostrictive/piezoelectric magnetoelectric (ME) heterostructure operating in shear mode.•A negative shear force as well as large internal anisotropic field is provided by SmFe2 plate due to its ferromagnetic and magnetostrictive properties.•Relationship between the shear-mode driving force and ME coefficients is analyzed.•This proposed laminate can be used in magnetic field detecting and energy harvesting without permanent magnets.
We report on a shear-mode off-antiresonance and antiresonance magnetoelectric (ME) responses in Tb0.3Dy0.7Fe1.92/Pb(Zr, Ti)O3/SmFe2 laminate multiferroic heterostructures for magnetic detecting and energy scavenging without bias field. A negative shear force as well as large internal anisotropic field is provided by SmFe2 plate due to its ferromagnetic and magnetostrictive properties, while the Terfenol-D plate provides a positive shear force to provoke a higher shear–stress transfer. Consequently, stronger ME coupling with a value of 2.24 V/Oe is obtained to be generated from the proposed architecture in the absence of the applied dc magnetic field. Experimental results exhibit an approximately linear sensitivity curve under off-antiresonance and antiresonance conditions, and the minimum stepped variations of input ac magnetic field as low as 2.43 × 10−8 T can be clearly distinguished under 111.5 kHz. In addition, a maximum power of 0.323 μW with a 2.6 MΩ load resistance in series connected to the ME laminate under the conditions of no bias can be achieved. These properties demonstrate that such a miniature multimode ME device is capable of weak magnetic field detecting and spatial magnetic energy scavenging by removing the requirement of dc bias field.
