Magneto-Mechano-Electric CoFe1.7Al0.3O4 - Ba0.85Ca0.15Zr0.10Ti0.90O3 multiferroic generator for vibration energy harvesting and magnetic field sensor applications

Magneto-mechanical-electric (MME) laminated structures of CoFe 1.7 Al 0.3 O 4 (CFAO having piezo-magnetic coefficient ( q 11 ) of -0.178 ppm/Oe) and Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (BCZT having d 33 172 pC/N and g 33 ∼ 6.07 × 10 −3 Vm/N ) phases was fabricated and tested for energy harvesting and magnetic field sensor response. The multifunctionality of the designed CoFe 1.7 Al 0.3 O 4 /Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 (CFAO/BCZT) and (CoFe 1.7 Al 0.3 O 4 / Ba 0.85 Ca 0.15 Zr 0.10 Ti 0.90 O 3 / CoFe 1.7 Al 0.3 O 4 ) (CFAO/BCZT/CFAO) laminates were investigated in transverse-transverse (TT) and longitudinal-transverse (LT) modes. Remarkably, the CFAO/BCZT/CFAO structure demonstrated a substantial magnetoelectric response, having a magnetoelectric coefficient (α ME ) of approximately 100 mV/cm·Oe at a magnetic field of 500 Oe and -82.75 mV/cm·Oe at a magnetic field of -300 Oe. Conversely, the harvested power for CFAO/BCZT/CFAO and CFAO/BCZT generators are 3.14 µW and 7 µW respectively. Thus, here we present the MME structures that are beneficial for magnetic field sensors as well as effective energy harvester application purposes. The observed results are discussed in context to the ME coupling and piezoelectric properties.