Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster Session

MM 26.55: Poster

Dienstag, 23. März 2010, 14:45–16:30, Poster C

Polymer-Based Magnetoelectric Composites — •Kerstin Meurisch, Vladimir Zaporojtchenko, Thomas Strunskus, and Franz Faupel — Technische Fakultät, Institut für Materialwissenschaft, CAU Kiel

In magnetoelectric (ME) materials the change of an external magnetic field induces a change of the internal electric potential. Composites containing a magnetostrictive phase embedded into a piezoelectric matrix exhibit very high indirect ME coefficients compared to those direct ones of single phase materials. Furthermore, using piezoelectric polymers as matrices is advantageous, for example if high flexibility of the product is required or if the product is very sensitive to leakage currents in the matrix. Since polymers generally have a very small dielectric constant and a low Young's modulus, their ME coefficients exceed those of ceramic-based composites. Regarding the design of the composites, several microstructures are possible. The most prominent designs are laminates and particulate structures. Two approaches for the development of an polymer-based ME composite are presented: Firstly, as a basic step towards particulate composites, piezoelectric thin films of Nylon-11 were deposited via thermal evaporation. Secondly, laminates were fabricated by sputtering Cobalt onto a purchased piezoelectric Polyvinylidenfluorid(PVDF) foil. Preliminary results such as the effective piezoelectric coefficient of Nylon-11 and the effective ME coefficient of the laminates will be discussed.