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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 25: Ferroics and Multiferroics (joint session KFM/TT/MA)

KFM 25.11: Vortrag

Donnerstag, 15. März 2018, 13:10–13:30, EMH 225

Lead Palladium Titanate: A new room-temperature magnetoelectric multiferroic — •Elzbieta Gradauskaite^1,2, Jonathan Gardner³, Rebecca M. Smith³, Finlay D. Morrison³, Stephen L. Lee¹, Ram S. Katiyar⁴, and James F. Scott^1,3 — 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 PbTi_1−xPd_xO₃ (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.