Impact of interfacial coupling of oxygen octahedra on ferromagnetic order in La
0.7Sr0.3MnO3/SrTiO3 heterostructures

Li, X.; Lindfors-Vrejoiu, I.; Ziese, M.; Gloter, A.; van Aken, P. A.

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Impact of interfacial coupling of oxygen octahedra on ferromagnetic order in La_0.7Sr_0.3MnO₃/SrTiO₃ heterostructures

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Li, X.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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van Aken, P. A.
Scientific Facility Stuttgart Center for Electron Microscopy (Peter A. van Aken), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Li, X., Lindfors-Vrejoiu, I., Ziese, M., Gloter, A., & van Aken, P. A. (2017). Impact of interfacial coupling of oxygen octahedra on ferromagnetic order in La_0.7Sr_0.3MnO₃/SrTiO₃ heterostructures. Scientific Reports, 7: 40068.

Cite as: https://hdl.handle.net/21.11116/0000-000E-D176-1

Abstract

La0.7Sr0.3MnO3, a half-metallic ferromagnet with full spin polarization, is generally used as a standard spin injector in heterostructures. However, the magnetism of La0.7Sr0.3MnO3 is strongly modified near interfaces, which was addressed as "dead-layer" phenomenon whose origin is still controversial. Here, both magnetic and structural properties of La0.7Sr0.3MnO3/SrTiO3 heterostructures were investigated, with emphasis on the quantitative analysis of oxygen octahedral rotation (OOR) across interfaces using annular-bright-field imaging. OOR was found to be significantly altered near interface for both La0.7Sr0.3MnO3 and SrTiO3, as linked to the magnetism deterioration. Especially in La-0.7Sr0.3MnO3/SrTiO3 superlattices, the almost complete suppression of OOR in 4 unit-cell-thick La0.7Sr0.3MnO3 results in a canted ferromagnetism. Detailed comparisons between strain and OOR relaxation and especially the observation of an unexpected La0.7Sr0.3MnO3 lattice c expansion near interfaces, prove the relevance of OOR for the magnetic properties. These results indicate the capability of tuning the magnetism by engineering OOR at the atomic scale.