Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Multiferroics

MA 38.1: Vortrag

Donnerstag, 26. März 2009, 15:15–15:30, HSZ 103

Interface modification in LCMO-BTO superlattices — •Kai Gehrke, Vasily Moshnyaga, and Konrad Samwer — I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

At perovskite interfaces, electric, magnetic and multiferroic (MF) properties can be different from those in bulk. Especially in manganite thin films and superlattices (SL) it is well known that breakage of symmetry at interfaces lead to orbital, charge and spin reconstructions[1]. Moreover, interfacial stress, which leads to lattice distortions, greatly influences ferromagnetic as well as ferroelectric polarizations. (LaCa)MnO₃−BaTiO₃ SL have been grown by a metalorganic aerosol deposition technique on MgO and STO substrates. Besides the magnetic properties, Magnetocapacitance as well as third harmonic Voltages have been measured to clarify the influence of the interfaces and their relation to the formation of correlated polaros. We show that compositional grading of the (LaCa)MnO₃ at the interfaces modifies the magnetic, electric and MF properties in a positive way. The magnetisation is increased, the manganite resistance is strongly reduced and third harmonic voltages are depressed. The work was supported by the Deutsche Forschungsgemeinschaft via SFB 602, project A2.

[1] Luis Brey, "Electronic phase separation in manganite-insulator interfaces", PHYSICAL REVIEW B 75, 104423 (2007)