Dresden 2014 – scientific programme
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DS: Fachverband Dünne Schichten
DS 11: Focus Session: Sensoric Micro and Nano-systems I
DS 11.5: Talk
Tuesday, April 1, 2014, 10:45–11:00, CHE 89
Giant magnetoelectric effect at low frequencies in polymer-based thin film composites — Amit Kulkarni1, Kerstin Meurisch1, Robert Jahns2, Iulian Teliban2, Andre Piorra3, •Thomas Strunskus1, Reinhard Knöchel2, and Franz Faupel1 — 1Chair for Multicomponent Materials, Institute for Materials Science, Christian-Albrechts-University at Kiel, Kaiserstr. 2, 24143 Kiel, Germany — 2Microwave Laboratory, Institute of Electrical and Information Engineering, Christian-Albrechts-University at Kiel, Kaiserstr. 2, 24143 Kiel, Germany — 3Chair for Inorganic Functional Materials Institute for Materials Science, Christian-Albrechts-University at Kiel, Kaiserstr. 2, 24143 Kiel, Germany
A new approach for the preparation of polymer based magnetoelectric sensors by spin-coating is presented. Poly(vinylidene fluoride trifluoroethylene)-copolymer 70/30 mol % (PVDF-TrEF) was used as piezo and metallic glass foils as magnetostrictive phase, respectively. The piezoelectric β phase fraction of the polymer layers were optimized by annealing and the films were polarized by contact poling. These films show a saturation polarization of 10 µC/cm2 and remanent polarization of 8 µC/cm2. For a prototype single-sided clamped cantilever, a magnetoelectric coefficient as high as 850 V/cmOe is observed at its fundamental bending mode resonance frequency at 27.8 Hz and a detection limit of 10 pT/Hz1/2 at its second bending mode resonance frequency at 169.5 Hz. Moreover, this technique allows easy variation of the thickness of the piezoelectric layer and much easier integration into devices.