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MA: Fachverband Magnetismus
MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)
MA 19.53: Poster
Tuesday, March 15, 2011, 10:45–13:00, P2
(contribution withdrawn) Magnetic Resonance and Magnetization Measurements of Multiferroic EuxBa1−xTiO3 — •Nataliya Georgieva1, Andreas Pöppl1, Rolf Böttcher1, Marko Bertmer1, Jürgen Haase1, and Alex Sushkov2 — 1Faculty of Physics and Earth Sciences, University of Leipzig, Germany — 2Department, Yale University, New Haven, Connecticut, USA
We are investigating multiferroic EuxBa1−xTiO3 with different Eu2+ concentrations (x = 1, 0.75, 0.5, 0.25) using magnetic resonance spectroscopy (EPR and NMR) and magnetization measurements.
The ceramics samples exhibit different magnetic and electric properties depending on their Eu2+ concentration. SQUID magnetization measurements have revealed Curie-Weiss behavior of all samples and magnetic ordering at low temperatures.
The X- and Q-band EPR spectra show strongly dipole-broadened and exchange-coupled Eu2+ signals. Temperature dependent line broadening effects are observed and differ for various Eu2+ concentrations.
Preliminary 137Ba NMR spectra were recorded using frequency stepped Hahn Echo experiments. The line width of the central 137Ba nuclear quadrupole transition shows a striking dependence on the Eu2+ concentration.