Piezoelectric response of a PZT thin film to magnetic fields from permanent magnet and coil combination

• Published in: Applied physics. A, Materials science & processing Vol. 118; no. 1; pp. 225 - 230
• Main Authors: Guiffard, B., Seveno, R.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.01.2015; Springer Verlag
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Direct current; Electric fields; Electrodes; Engineering Sciences; Lead zirconate titanates; Machines; Magnetic fields; Magnetic induction; Manufacturing; Nanotechnology; Optical and Electronic Materials; Permanent magnets; Physics; Physics and Astronomy; Processes; Surfaces and Interfaces; Thin Films; Electric Field Magnitude; Piezoelectric Response; Dynamic Magnetic Field; Open Circuit Condition; Voltage Coefficient
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-014-8600-3

In this study, we report the magnetically induced electric field E 3 in Pb(Zr 0.57 Ti 0.43 )O 3 (PZT) thin films, when they are subjected to both dynamic magnetic induction (magnitude B ac at 45 kHz) and static magnetic induction ( B dc ) generated by a coil and a single permanent magnet, respectively. It is found that highest sensitivity to B dc — Δ E 3 Δ E 3 Δ B dc Δ B dc —is achieved for the thin film with largest effective electrode. This magnetoelectric (ME) effect is interpreted in terms of coupling between eddy current-induced Lorentz forces (stress) in the electrodes of PZT and piezoelectricity. Such coupling was evidenced by convenient modelling of experimental variations of electric field magnitude with both B ac and B dc induction magnitudes, providing imperfect open circuit condition was considered. Phase angle of E 3 versus B dc could also be modelled. At last, the results show that similar to multilayered piezoelectric-magnetostrictive composite film, a PZT thin film made with a simple manufacturing process can behave as a static or dynamic magnetic field sensor. In this latter case, a large ME voltage coefficient of α = E 3 E 3 B ac B ac = 3.55 V / cm Oe under B dc  = 0.3 T was found. All these results may provide promising low-cost magnetic energy harvesting applications with microsized systems.