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Detailed Program
Paper Number : PI-O03
Time Frame : 11:49~12:01
Presentation Date : hurseday, 27, November
Session Name : Piezoelectric Materials, Devices & Applications
Session Chair 1# : Hongsoo Choi
Session Chair 2# : Isaku Kanno
Exceptionally High Magnetoelectric Characteristics in Laser Annealed PZT Thick Films on Magnetostrictive Metglas Foil
Haribabu PALNEEDI
Korea Advanced Institute of Science and Technology (KAIST)
Engineered magnetoelectric (ME) composites or heterostructured films of magnetostrictive–piezoelectric constituents exhibit stronger ME interactions which are mediated by magnetically induced mechanical forces. These ME composites are attractive, for potential applications in sensors, transducers, and energy harvesting devices, because of their unique magnetic-electric transduction. In this work, we report exceptionally high ME output observed in composites of laser annealed lead zirconate titanate (PZT) thick films and Metglas (FeBSiC alloy). Highly dense piezoelectric films of PZT with layer thickness 2-6 ¥ìm were deposited onto amorphous magnetostrictive Metglas (25 ¥ìm-thick) by aerosol deposition and then annealed using continuous-wave Yb-doped fiber laser irradiation (560 nm wavelength). Laser annealing was employed to induce grain growth in the as-deposited PZT films and to avoid thermal damage of the substrate so that its inherent magnetostrictive characteristics would be intact. X-ray diffraction and scanning electron microscopy results revealed that single phase, well-bonded and crack-free PZT thick films were formed and no interfacial reaction between the PZT and Metglas phases took place. The laser annealed thick films showed largely improved dielectric, ferroelectric properties compared to as-deposited ones. The PZT/Metglas thick film composites were found to exhibit magnetoelectric voltage coefficients in the range of 200-1500 mV/cm.Oe under a very low bias magnetic field of 30 Oe. The results of the present work demonstrate the applicability of laser annealing in the fabrication of thick film magnetoelectric composites with enhanced properties.

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