Magnetoelectric effects in ferromagnetic cobalt/ferroelectric copolymer multilayer films

Mardana, A.; Mengjun Bai; Baruth, A.; Ducharme, Stephen; Adenwalla, S.
September 2010
Applied Physics Letters;9/13/2010, Vol. 97 Issue 11, p112904
Academic Journal
Interactions between a ferromagnet, cobalt, and a ferroelectric copolymer, poly(vinylidene fluoride with trifluoroethylene) in thin film heterostructures result in a 5% change in the ferroelectric polarization on application of a perpendicular 6 kG magnetic field corresponding to a magnetoelectric coupling coefficient of α=5.45 V/cm Oe. The effect disappears on magnetic saturation, ruling out conventional strain coupling. A simple model posits that the ferroelectric film develops in-plane strain gradients, a consequence of the coupling to strain gradients present at the domain walls in the multidomain Co layer, resulting in the measured polarization change via the flexoelectric effect.


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