SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 42: Poster: Nanostructures at Surfaces

O 42.12: Poster

Dienstag, 28. März 2023, 18:00–20:00, P2/EG

Structural and magnetic properties of epitaxial iron oxide nanoislands on SrTiO₃ — •Steffen Tober, Mai H. Hamed, Yifan Xu, Asmaa Qdemat, Connie Bednarski-Meinke, Ulrich Rücker, Oleg Petracic, Emmanuel Kentzinger, and Thomas Brückel — Jülich Centre for Neutron Science (JCNS) and Peter Grünberg Institut (PGI), JARA-FIT, Forschungszentrum Jülich

The chemical, electronic and magnetic properties of Fe_xO_y/oxide substrate heterostructures depend on substrate interactions and the flexible chemistry of the iron oxides, resulting in conductive or insulating, ferri- or antiferromagnetic phases. The reduced geometry of Fe_3−δO₄ nanoislands grown by reactive molecular beam epitaxy enables further tuning of electronic and magnetic properties for applications in catalysts and magnetoelectric devices [1]. We present the structural and magnetic characterisation of Fe_3−δO₄ nanoislands on (001) oriented SrTiO₃ with mixed SrO/TiO₂ and stepped TiO₂ surface terminations by reflection high-energy electron diffraction (RHEED), grazing incidence small angle X-ray scattering (GISAXS) and SQUID magnetometry [2,3]. Our findings indicate the growth of crystalline, evenly shaped, ferrimagnetic islands. These results form the basis for further experiments probing the local electronic and magnetic structure of the nanoislands.

[1] Y. Z. Chen et al., J. Appl. Phys. 103, 07D703 (2008), [2] G. E. Sterbinsky et al., J. Vac. Sci. Technol. B 25, 1389 (2007), [3] JCNS, JLSRF, 2, A61 (2016).