Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.7: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Localized magnetoelectric effect in BaTiO₃/Hexaferrite composite ceramics — •Harsh Trivedi¹, Vladimir Shvartsman¹, Doru Lupascu¹, Rob Pullar², and Andrei Kholkin² — ¹Institute für Materialwissenschaft, Universität Duisburg-Essen, Essen Germany — ²CICECO, University of Aveiro, Aveiro, Portugal

Due to its novel technological implications, the magnetoelectric(ME) effect has led to a bright prospectus for materials that show a direct or indirect coupling between the magnetic and electric order parameters. Owing to scarcity of intrinsic multiferroics, the strain mediated composite systems are a promising approach towards realizing an increased magnetoelectric coupling in bulk materials. The present state of the art in these materials demand concerted efforts toward a better understanding of microscopic mechanisms in the coupling phenomena. Since bulk ME measurements suffer inherent drawbacks concerned with electrical poling, in this work we have studied localized ME effect using scanning probe microscopy(SPM) techniques like Magnetic Force Microscopy(MFM) and Piezoresponse Force Microscopy(PFM ) of bulk ME composite ceramics with a homogeneous distribution of piezoelectric(BaTiO₃) and ferrite(BaFe₁₂O₁₉/SrFe₁₂O₁₉) phases. MFM shows a clear restructuring of juxtaposed magnetic domains indicating motion of the domain walls under the effect of applied electric field. Also we observed the effect of magnetic field on the localized hysteresis behavior of constituent BaTiO₃ phase. The observed ME coupling is attributed to strain induced changes taking place