Berlin 2018 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 11: Thin Film Properties: Structure, Morphology and Composition (XRD, TEM, XPS, SIMS, RBS, AFM, ...): Session II

DS 11.11: Vortrag

Dienstag, 13. März 2018, 12:15–12:30, H 0111

Influences of growth kinetics on interface structure and magnetism in La_1/3Sr_2/3FeO₃/La_2/3Sr_1/3MnO₃ heterostructures — •Markus Waschk¹, Jörg Voigt¹, Paul Zakalek¹, Juri Barthel², and Thomas Brückel¹ — ¹Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science (JCNS-2) and Peter Grünberg Institut (PGI-4), JARA-FIT, 52425 Jülich, Germany — ²Forschungszentrum Jülich GmbH, Ernst Ruska-Centre for Microscopy with Electrons (ER-C-2), 52425 Jülich, Germany

Transition metal oxide heterostructures like La_1/3Sr_2/3FeO₃/ La_2/3Sr_1/3MnO₃ (LSFO/LSMO) has been chosen as a model system to study the interfacial coupling between an antiferromagnet (LSFO) and a ferromagnet with regard to different growth kinetics. Two epitaxial heterostructures (LSFO/LSMO and LSMO/LSFO) were grown with a combination of oxide molecular beam epitaxy and high oxygen sputtering on (001)-oriented SrTiO₃ substrates. Subsequent structural analysis with e.g. scanning transmission electron microscopy and energy dispersive X-ray spectroscopy revealed that the interface morphology depends crucially on the growth order. The interface in LSMO/LSFO is dominated by iron interdiffusion from the LSFO into the LSMO layer in at least nine monolayers, where Fe occupies the Mn sites. This leads to significant changes of the magnetic properties within the interface region. In contrast, LSFO/LSMO exhibits a sharp interface. Polarized neutron reflectometry was used to investigate the magnetization profile of both samples and revealed a highly reduced magnetization at the interface for the case of interdiffusion.