Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.56: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Microstructure and magnetic properties of BaTiO₃-(Ni,Zn)Fe₂O₄ multiferroics — •Michael R. Koblischka¹, Anjela Koblischka-Veneva², Michael Wick¹, Liliana Mitoseriu³, and Uwe Hartmann¹ — ¹Experimental Physics, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany — ²Functional Materials, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany — ³Department of Solid State and Theoretical Physics, Al. I. Cuza University, Iasi 700506, Romania

The microstructures of BaTiO₃-(Ni,Zn)Fe₂O₄ (BT-NZF) multiferroics with various mixing ratios (70:30, 60:40 and 50:50) [1] are investigated by means of electron-backscatter diffraction (EBSD) [2] and magnetic force microscopy (MFM). The EBSD measurements reveal a change in the texture of the ferrite and the BaTiO₃ grains upon increasing the ferrite content in the sample. The 70:30 sample exhibits the best ferrite texture, where only some directions are present. Furthermore, the resulting grain sizes vary from several µm (50:50) to about 100 nm in the 70:30 sample. The MFM images reveal the presence of magnetic domains being extended over several adjacent grains, which according to the EBSD data may comprise different crystallographic orientations. In this way, we can explain the differences in the magnetic contrast obtained.

[1] L. Mitoseriu et al., JMMM 316, e603 (2007) [2] A. Koblischka-Veneva et al., IEEE Trans. Magn. 42, 2873 (2006)