Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Multiferroics
MA 20.6: Vortrag
Mittwoch, 27. Februar 2008, 15:15–15:30, EB 202
Magnetoelectric coupling in La2/3Ca1/3MnO3-BaTiO3 superlattices — •Kai Gehrke1, Vasily Moshnyaga1, Konrad Samwer1, and Alexandr Belenchuk2 — 1I. Physikalisches Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany — 2Institute of Applied Physics, Academieis 5, MD-2028 Chisinau, Moldova
Artificial composites of ferromagnetic and ferroelectric phases are promising for the study of magnetoelectric phenomena. We have prepared LCMO-BTO superlattices on MgO substrates, using the metalorganic aerosol deposition technique. Very high values of magnetocapacitance, MC=[C(7T)−C(0)]/C(0)=800%, were observed. The treatment in terms of an equivalent circuit shows that the majority of this effect originates from the colossal magneto resistance (CMR), present in the LCMO-layers. Considering the resistance of LCMO, one can separate the "CMR-part" from the "coupling-part" of the MC. The analysis shows that the coupling is present in the ferromagnetic state only and results in a linear dependence of the BTO-layer capacitance on magnetic field (CBTO=C0+α|H|). This MC is as large as MC=16% at T=TMI, and MC=5% at low temperature.
The work was supported by the Deutsche Forschungsgemeinschaft via SFB 602, project A2.