Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 45: Ferroics and Multiferroics (joint session KFM/TT/MA)
MA 45.11: Vortrag
Donnerstag, 15. März 2018, 13:10–13:30, EMH 225
Lead Palladium Titanate: A new room-temperature magnetoelectric multiferroic — •Elzbieta Gradauskaite1,2, Jonathan Gardner3, Rebecca M. Smith3, Finlay D. Morrison3, Stephen L. Lee1, Ram S. Katiyar4, and James F. Scott1,3 — 1School of Physics and Astronomy, University of St Andrews, United Kingdom — 2Present address: Department of Materials, ETH Zürich, Zürich, Switzerland — 3School of Chemistry, University of St Andrews, United Kingdom — 4Department of Physics, SPECLAB, University of Puerto Rico, USA
Magnetoelectric multiferroic materials combine the advantages of FeRAMs (speed, low power) and MRAMs (non-destructive readout) due to the linear (magnetoelectric) coupling between ferroelectricity and ferromagnetism. Despite the worldwide interest and effort, very few single-phase materials have been discovered that exhibit magnetoelectric coupling at room temperature. Until very recently BiFeO3 was the only one, however it is not suitable for real practical device applications due to high leakage currents and weak coupling. Here, we demonstrate that PbTi1−xPdxO3 (0 <x <0.3) is multiferroic up to 400 K and possesses a strong magnetoelectric coupling. This observation is remarkable because Pd is difficult to substitute into ABO3 perovskite oxides and it is magnetic only under unusual conditions (strain or internal electric fields). Dielectric spectroscopy and magnetization studies will be discussed in detail, while paying particular attention to secondary phases present in the bulk specimen, identified as PdO, PbPdO2 and Pd3Pb using PXRD, SEM, EDX and XPS.