Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II

MA 52.65: Poster

Donnerstag, 15. März 2018, 15:00–18:00, Poster C

Exploring magnetoelectricity at the nanoscale in two-phase hetero-structured multiferroic thin films — •Muhammad Naveed-Ul-Haq¹, Vladimir Shvartsman¹, Harsh Trivedi¹, Samira Webers², Heiko Wende², and Doru Lupascu¹ — ¹Institute for Materials Science and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg- Essen, Universitätsstraße 15, 45141 Essen, Germany. — ²Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany.

High quality epitaxial bi-layered CoFe₂O₄−BaTiO₃ thin films were prepared on SrTiO₃:Nb(100) and SrTiO₃:Nb(111) substrates using pulsed laser deposition. X-ray diffraction and transmission electron microscopy showed that the films are polycrystalline single-phase perovskite, free of additional phases. Piezoforce response microscopy revealed that the film on SrTiO₃:Nb(111) substrate shows strong lateral and vertical PFM responses. However, the film on SrTiO₃:Nb(100) shows good response only in the lateral direction. The magnetoelectric properties were studied by applying an in-plane magnetic field and measuring the piezoresponse and a subsequent analysis via the principal components analysis (PCA). It was discovered that the thin films grown on SrTiO₃:Nb(111) substrate show a better strain mediated coupling than those grown on SrTiO₃:Nb(100) substrate. Thus it is concluded that the substrate orientation has a strong influence on the local piezoelectric and magnetoelectric properties of films.