Giant Magnetoelectric Effect in Thin‐Film Composites

• DOI: 10.1111/jace.12400
• Publication Date: 2013-05-30T11:38:41Z
• Authors: Robert Jahns; Andre Piorra; Enno Lage; Christine Kirchhof; Dirk Meyners; Jascha Lukas Gugat; Matthias Krantz; Martina Gerken; Reinhard Knöchel; Eckhard Quandt
• Keywords: Magnetoelectric effect; Mechanical Resonance

Highly sensitive AC magnetic field sensors are presented using magnetoelectric composites consisting of magnetostrictive and piezoelectric phases. They offering passive nature, high sensitivity, large effect enhancement at mechanical resonance, linear dynamic range. Thin‐film 2‐2 benefit from perfect coupling between the phases reduction in size which is essential for spatial resolution. Their design uses AlN a plate capacitor or PZT with interdigital electrodes amorphous FeCoSiB single layers exchanged biased multilayers. At resonance depending on geometry, extremely ME coefficients up to 9.7 kV/cm Oe air 19 under vacuum were obtained. To avoid external DC bias fields, multilayers serving as component maximum coefficient zero employed. Furthermore, anisotropic response these can be utilized three‐dimensional vector sensing. Sensitivity noise revealed limits detection good 2.3 pT/Hz 1/2 resonance. 0.1 1000 Hz outside enhanced through frequency conversion fields.