Regensburg 2013 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 2: Multiferroics 2 (MA jointly with DF, DS, KR, TT)

KR 2.9: Vortrag

Montag, 11. März 2013, 17:15–17:30, H3

Epitaxial thin films of the multiferroic double perovskite Bi₂FeCrO₆ — •Vikas Shabadi, Mehran Vafaee, Mehrdad BaghaieYazdi, Aldin Radetinac, Philipp Komissinskiy, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, Germany

Co-existence of magnetism and ferroelectricity was theoretically predicted in the ordered double perovskite Bi₂FeCrO₆ (BFCO) [1]. We report epitaxial BFCO thin films grown by pulsed laser deposition from a 20% Bi-rich ceramic target on single crystal SrTiO₃(100) substrates. The degree of the Fe-Cr cation ordering in the BFCO films was calculated based on the X-ray diffraction patterns. The magnetic moments of the BFCO films were measured with a SQUID magnetometer and analyzed as a function of the Fe-Cr ordering. The discrepancies in the previously reported values of the magnetic moment of BFCO [2,3] are most likely connected to the varying degree of the Fe-Cr cation ordering in the samples. In a recent experiment more than 90% spontaneous B-site ordering in a similar Fe-Cr based double perovskite system has been achieved [4]. Anti-site disorder control is a key challenge to design double perovskite multiferroics.

[1]P. Baettig and N. A. Spaldin, Appl. Phys. Lett. 86, 012505 (2005)

[2]Kim et al., Appl. Phys. Lett. 89, 102902 (2006)

[3]R. Nechache et al., J. Appl. Phys. 105, 061621 (2009)

[4]S. Chakraverty et al., Phys. Rev. B 84, 064436 (2011)

The authors acknowledge support from DAAD.