Berlin 2015 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 3: Poster Session on Ferroic Domain Walls - Multiferroics (DF jointly with KR, MA, TT)
KR 3.13: Poster
Montag, 16. März 2015, 19:00–21:00, Poster C
The magnetoelectric effect across scales — •Doru C. Lupascu1, Heiko Wende2, Jörg Schröder3, Matthias Labusch3, Morad Etier1, Ahmadshah Nazrabi1, Irina Anusca1, Harsh Trivedi1, Yanling Gao1, Marianela Escobar1, Vladimir V. Shvartsman1, Joachim Landers2, Soma Salamon2, and Carolin Schmitz-Antoniak4 — 1Materials Science & Center for Nanointegration Duisburg-Essen (CENIDE) — 2Faculty of Physics & CENIDE — 3Institute of Mechanics, all at University of Duisburg-Essen — 4Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich
Magnetoelectric coupling can arise in intrinsic multiferroics as well as composites. We will outline how for intrinsic BiFeO3 nanoparticles yield different magnetoelectric properties at room temperature than larger grains or bulk material. Magnetoelectric nanoscale composites of BaTiO3 and CoFe2O4 display rather poor magnetoelectric coupling macroscopically. Their micron scale counterparts on the other hand yield nice macroscopic response. The mechanical, electrical, and magnetic effects are analyzed using techniques including Mössbauer spectroscopy, magnetic force microscopy, piezoforce microscopy, and macroscopic techniques. It will be shown that microscopic coupling is strong also for (partly) conducting magnetic inclusions and nanosystems while macroscopic properties are highly dependent on good insulation of the samples. Experimental asymmetries in determining the magnetoelectric coupling coefficient are discussed.
Support via FP7 Marie Curie Initial Training Network *Nanomotion* (grant n∘ 290158) & Forschergruppe 1509 are acknowledged.