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Dresden 2017 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 8: Ferroics - Domains, Domain Walls and Skyrmions I

DF 8.10: Vortrag

Dienstag, 21. März 2017, 12:30–12:45, WIL B321

Conductive domain walls in SrMnO3 thin films under epitaxial tensile strain — •Lokamani Lokamani1, Carina Faber3, Peter Zahn1, Nicola Spaldin3, and Sibylle Gemming1,21Institute of Ion Beam Physics and Materials Research, HZDR, 01314 Dresden, Germany — 2Institute of Physics, Technische Universität, 09107 Chemnitz, Germany — 3Materials Theory, ETH, 8093 Zürich, Switzerland

Strontium manganate (SrMnO3), a perovskite polymorph, exhibits cubic structure at low temperatures, which transforms into a hexagonal one at high temperatures. Density-functional calculations showed earlier, that under tensile strain the ground state of bulk SrMnO3 corresponds to a G-type-antiferromagnetic (G-AFM) cubic structure. If deposited as epitaxially strained thin film a rearrangement of the MnO6 coordination polyhedra was calculated, which is antiferrodistortive in the plane parallel to the substrate[1]. Recently, ferroelectric domains have been observed experimentally in 20nm thin films of SrMnO3 under 1.7% tensile strain on (001)-oriented LSAT[2]. Strikingly, the domain walls were found to be electrically insulating, rendering the domains to form stable nano-capacitors.

Here, we present a first-principle investigation of the domain wall formation in epitaxially strained SrMnO3 and a discussion of the electronic properties.

[1] J. H. Lee et al., PRL 104, 207204 (2010)

[2] C. Becher et al., Nature Nanotechnology 10, 661 (2015)

Funding by VI Memriox(VH-VI-422) & Nanonet(VH-KO-606)

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