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Optimization of Metglas 2605SA1 and PZT-5A Magnetoelectric Laminates for Magnetic Sensing Applications
Eugene Freeman1, Joshua Harper2, Nishit Goel1
1Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania, USA.
Abstract:
Via optimization of the mechanical coupling, alignment of Metglas® magnetic domains, relief of residual stress, and operation of the PZT-5A under a DC electric field of 2 kV/cm an unprecedented magnetoelectric voltage coefficient of 9.52 V/cm-Oe is achieved; resulting to a magnetic field sensitivity of 150 pT at 20 Hz for a d31 Metglas®/PZT-5A laminate. Mechanical coupling is improved by reducing the thickness and porosity of the epoxy. The Metglas® residual stress reduction and easy axis alignment is accomplished by a 30 minute 400 °C anneal under a 1600 Oe magnetic field in vacuum. Finally, a DC electric field bias is applied to increase the d coefficient of the PZT-5A piezoelectric.
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