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Structural reconstructions and emerging interface spin textures at (111)-oriented epitaxial perovskite interfaces

Date : Monday, December 17th, 2018 13:00 - 14:00 Place : Seminar Room 5 (A615), 6th Floor, ISSP Lecturer : Prof. Thomas Tybell Affiliation : Norwegian University of Science and Technology,Trondheim, 7491, Norway Committee Chair : Mikk Lippmaa (63315)

Perovskite oxides are technologically interesting because of their strong structure–property coupling, with interesting functional properties ranging from ferromagnetism, ferroelectricity to high-temperature superconductivity. Here I will give an overview of our work on synthesis of atomically smooth (111)-oriented oxides and discuss the effect of crystalline facets on their physical properties. Of special interest are structural effects at epitaxial interfaces promoting novel functional properties. To address this question (111)-oriented epitaxial heterostructures of antiferromagnetic (AF) LaFeO3 and ferromagnetic La0.7Sr0.3MnO3 are used as a model system. To probe the interface spin texture, we rely on a combination of soft x-ray spectroscopy, neutron reflectometry, magnetometry, TEM, and DFT investigations. By increasing the LaFeO3 thickness, a change from out-of-plane to in-plane AF spin axis takes place above 16 d111-layers, below which a magnetic interface reconstruction with a net switchable Fe moment of LaFeO3 is observed when deposited on SrTiO3. By using orthorhombic substrates, the magnetic anisotropy of the reconstructed interface can be controlled, from 6-fold when deposited on cubic SrTiO3 to 2-fold. In the presentation I will especially focus on the importance of the interplay between local AF order and concurrent structural reconstructions at interfaces to establish a magnetic reconstruction, opening for tuning the AF-spin texture by interface engineering.

References:
Phys. Rev. Materials 2, 014404 (2018)
J. Phys.: Cond. Matter 30, 255702 (2018)
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Phys. Rev. B 94, 201115 (2016)
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(Published on: Friday December 7th, 2018)