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Impact of Growth Kinetics on the Interface Morphology and Magnetization in La1/3Sr2/3FeO3/La2/3Sr1/3MnO3 Heterostructures



M. Waschk, A. Sarkar, J. Barthel, J. Voigt, S. Schroder, P. Zakalek, M. Schmitz, Brian Kirby, S. Putter, J. Schubert, T. Bruckel


The ability to create atomically perfect, epitaxial heterostructures of correlated complex perovskite oxides using state-of-art thin film deposition techniques has generated new physical phenomena at engineered interfaces. Here we report on the impact of growth kinetics on the magnetic structure and exchange coupling at the interface in heterostructures combining layers of antiferromagnetic La1/2Sr2/3FeO3 (LSFO) and ferromagnetic La2/3Sr1/3MnO3 (LSMO) on (001)-oriented SrTiO3 (STO) substrates. Two growth orders (g.o.) are investigated, (a) LSMO/LSFO/STO(001) and (b) LSFO/LSMO/STO(001), where the LSFO layer is grown by molecular beam epitaxy and the LSMO layer by high oxygen pressure sputtering. The interface has been investigated using electron microscopy and polarized neutron reflectometry. Interdiffusion over 7 monolayers is observed in LSMO/LSFO (g.o., a) with almost 50% reduction in magnetization at the interface and showing no exchange coupling. However, the exchange bias effect (υ0HE=-2.35mT at 10K) could be realized when the interface is atomically sharp, as in LSFO/LSMO (g.o., b). Our study therefore reveals that, even for well ordered and lattice-matched structures, the kinetics involved in the growth processes drastically in influences the interface quality with a strong correlation to the magnetic properties.
Journal of Physics: Condensed Matter




Waschk, M. , Sarkar, A. , Barthel, J. , Voigt, J. , Schroder, S. , Zakalek, P. , Schmitz, M. , Kirby, B. , Putter, S. , Schubert, J. and Bruckel, T. (2020), Impact of Growth Kinetics on the Interface Morphology and Magnetization in La<sub>1/3</sub>Sr<sub>2/3</sub>FeO<sub>3</sub>/La<sub>2/3</sub>Sr<sub>1/3</sub>MnO<sub>3</sub> Heterostructures, Journal of Physics: Condensed Matter, [online], (Accessed June 16, 2024)


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Created April 16, 2020, Updated October 12, 2021