Berlin 2015 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 9: Focused Session on Ferroic Domain Walls III (DF with MA)
DF 9.2: Talk
Tuesday, March 17, 2015, 14:20–14:40, EB 107
Microscopic perspective of magnetoelectric effect in multiferroic composites — •Harsh Trivedi1, Vladimir V. Shvartsman1, Doru C. Lupascu1, Robert C. Pullar2, Marcos S. A. Medeiros2, Andrei L. Kholkin2, Pavel Zelanovskiy3, and Vladimir Ya. Shur3 — 1Institute for Materials Science and Centre for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, 45141 Essen, Germany — 2Department of Materials and Ceramic Engineering & CICECO, University of Aveiro, 3810193 Aveiro, Portugal — 3Institute of Natural Sciences, Ural Federal University, 620002 Ekaterinburg, Russia
An extensive analysis of microscopic studies on bulk multiferroic composites is presented. Piezoresponse force microscopy (PFM) is used as a tool to study magnetoelectric effect in composites at local scale. Indirect influence of the stress, that mediates the ME effect, on the PFM response and local switching parameters is evaluated. Principal component analysis is utilized to extract the valuable data buried under noise and statistical inhomogeneity in order to create a spatial visualization of the effect. The spatial distribution of the intensity of the magnetoelectric coupling reveals interesting phenomena at the interface suggesting a resemblance to Eshelby's solution for elliptical inclusion in a matrix. Spatially resolved Raman spectroscopy mapping reveals a similar dominance of the stress at the interfaces corroborating the PFM findings. Finally, a simplified FEM based theoretical model simulating the realistic polycrystalline microstructure is presented, in order to compare the experimental findings.