Self-Assembled Multiferroic Nanostructures and Studies on Magnetoelectric Interactions
Technical Report,15 Sep 2012,14 Sep 2016
OAKLAND UNIV ROCHESTER MI ROCHESTER United States
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Ferromagnetic ferroelectric composites show strong magneto-electric ME coupling at room temperature that is mediated by mechanical forces. The focus of the proposed effort was on ME interactions in core-shell nanoparticles and nanowires of ferrite-piezoelectrics. The large surface area-to-volume ratio for the nanocomposites is expected to lead to a much stronger ME interactions compared to bulk materials. We modeled ME interactions in nanobilayers, nanopillars and nanotubes comprising a ferroelectric phase and a ferromagnetic phase. The model for low frequency ME coupling predicted a substantial reduction in ME coefficients in nanobilayers on a substrate due to substrate clamping, but the clamping effects can be substantially reduced in core-shell particles and coaxial wires. The important inferences from the models were the prediction of strong ME coupling at low-frequencies and at resonance modes in nanocomposites and the potential for novel devices based on the phenomena for high frequency electronics.
- Electricity and Magnetism