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O: Fachverband Oberflächenphysik

O 110: Surface Magnetism

O 110.9: Talk

Friday, March 22, 2024, 12:30–12:45, MA 144

Shape and magnetism of Fe_3−δO₄ nanoislands on SrTiO₃ — •Steffen Tober¹, Yifan Xu¹, Mohammad Tehrani^2,3, Mai H. Hamed¹, Asmaa Qdemat¹, Nadine Seidel¹, Jan-Christian Schober^2,3, Vedran Vonk², Connie Bednarski-Meinke¹, Ulrich Rücker¹, Andreas Stierle^2,3, and Emmanuel Kentzinger¹ — ¹Jülich Centre for Neutron Science (JCNS) and Peter Grünberg Institut (PGI), JARA-FIT, Forschungszentrum Jülich — ²Deutsches Elektronen-Synchrotron DESY, Centre for X-ray and Nanoscience, Hamburg — ³Universität Hamburg, Fachbereich Physik

The magnetic properties of Fe_3−δO₄ nanoparticles for medical applications depend on the synthesis route influencing their defect structure, ligand shell and shape [1]. Optimisation of the magnetisation requires disentangling preparation-specific influences from intrinsic size effects. Fe_3−δO₄ nanoislands on SrTiO₃ are introduced as a ligand-free model system with defined structure and orientation to study the magnetic properties of iron oxide nanostructures. Characterisation by diffraction, grazing incidence small angle X-ray scattering, neutron reflectivity and SQUID indicates the formation of crystalline, uniformly shaped nanoislands with a distinct magnetic shape anisotropy [2]. Our results form the basis for ongiong in situ studies probing interdependencies between composition, shape, defect structure and magnetisation of nanostructured iron oxides.

[1] D. Zákutná et al., PRX 10, 031019 (2020),[2] A. Devishvili et al., Rev. Sci. Instrum. 84, 025112 (2013).

Keywords: Iron oxide; Neutron reflectivity; Nanoislands; GISAXS; SrTiO3