This title appears in the Scientific Report : 2020 

Impact of growth kinetics on the interface morphology and magnetization in La 1/3 Sr 2/3 FeO 3 /La 2/3 Sr 1/3 MnO 3 heterostructures
Waschk, M.
Sarkar, A. (Corresponding author) / Barthel, J. / Voigt, J. / Schröder, S. / Zakalek, P. / Schmitz, Markus / Kirby, B. J. / Pütter, S. / Schubert, J. / Brückel, T.
Streumethoden; JCNS-2
Wissenschaftlicher Geschäftsbereich II; VS-II
Materialwissenschaft u. Werkstofftechnik; ER-C-2
Halbleiter-Nanoelektronik; PGI-9
High Brilliance Source; JCNS-HBS
Streumethoden; PGI-4
Journal of physics / Condensed matter Condensed matter, 32 (2020) 16, S. 165801 -
Bristol IOP Publ. 2020
Journal Article
Jülich Centre for Neutron Research (JCNS)
Materials and Processes for Energy and Transport Technologies
Quantum Condensed Matter: Magnetism, Superconductivity
Controlling Collective States
Controlling Collective States
Please use the identifier: in citations.
Please use the identifier: in citations.
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 La1/3Sr2/3FeO3 (LSFO) and ferromagnetic La2/3Sr1/3MnO3 (LSMO) on (0 0 1)-oriented SrTiO3 (STO) substrates. Two growth orders are investigated, (a) LSMO/LSFO/STO(0 0 1) and (b) LSFO/LSMO/STO(0 0 1), 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 seven monolayers is observed in LSMO/LSFO (a) with an almost 50% reduction in magnetization at the interface and showing no exchange coupling. However, the exchange bias effect ( mT at 10 K) could be realized when the interface is atomically sharp, as in LSFO/LSMO (b). Our study therefore reveals that, even for well ordered and lattice-matched structures, the kinetics involved in the growth processes drastically influences the interface quality with a strong correlation to the magnetic properties.