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DS: Fachverband Dünne Schichten

DS 11: Focus Session: Sensoric Micro and Nano-systems I

DS 11.1: Hauptvortrag

Dienstag, 1. April 2014, 09:30–10:00, CHE 89

Giant magnetoelectric thin film composites — •Andre Piorra, Robert Jahns, Enno Lage, Christine Kirchhof, Erdem Yarar, Volker Röbisch, Dirk Meyners, Reinhard Knöchel, and Eckhard Quandt — Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany

Magnetoelectric (ME) composite materials show ME coefficients that are larger than that of natural multiferroics by several orders of magnitude. These ME composites have high potential for applications, e.g. as very sensitive ac magnetic field sensors. Special features are their passive nature, their high sensitivity, and their large dynamic range with linear response.

The thin film ME 2-2 composites of this work consist of either AlN or ferroelectric piezoelectrics and different magnetostrictive layers that show extremely high ME coefficient of up to 20 kV/cmOe at mechanical resonance in vacuum (1). However, these composites require in general the presence of an external d.c. magnetic bias field, which is detrimental to their use as sensitive magnetic-field sensors. Composites using exchange biased magnetstrictive layers are used to adjust the shift of the magnetostriction curve in such a way that the maximum magnetoelectric coefficient occurs at zero magnetic bias field (2). In this presentation different thin film composites will be discussed in view of their use as very sensitive magnetic field sensors .

(1) Appl. Phys. Lett. 102, (2013), 232905. (2) Nature Materials 11 (6) (2012), 523-529.

Funding via the DFG SFB 855 is gratefully acknowledged.