Dresden 2014 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 4: Multiferroics I (MA jointly with DF, DS, KR, TT)

KR 4.7: Vortrag

Dienstag, 1. April 2014, 11:15–11:30, BEY 118

Investigation of A-site Bismuth based double perovskites as potential room-temperature multiferroics — •Vikas Shabadi, Mehran VafaeeKhanjani, Mehrdad BaghaieYazdi, Aldin Radetinac, Philipp Komissinskiy, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Germany

A-site Bismuth based double perovskites (Bi₂BB’O₆), where ferroelectricity arises from the stereochemically active 6s² lone pair of electrons on the Bi³⁺ cations, provide a vital test bed to engineer room temperature multiferroicity. Here, different combinations of 3d-3d or 3d-5d cations may be introduced at the B-site in order to obtain an effective ferri/ferromagnetic moment. The 3d-3d compound Bi₂FeCrO₆ (BFCO) has drawn a heightened interest due to its large experimentally reported ferroelectricity and divergent observations of its magnetic properties. We report epitaxial BFCO thin films grown by pulsed laser deposition on single crystal SrTiO₃(100) substrates. Detailed structural characterization was performed by X-ray Diffraction and the magnetic properties were studied with a SQUID magnetometer. We show that BFCO adopts a superstructure with the same unit cell as the chemically ordered double perovskite. The magnetization is a function of chemical but not of structural order.