Berlin 2024 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Micro- and Nanostructured Magnetic Materials

MA 13.5: Vortrag

Montag, 18. März 2024, 16:00–16:15, EB 407

Geometric tuning of the structural and magnetic properties of magnetic thin films via deposition onto highly ordered arrangements of nanospheres — •Asmaa Qdemat¹, Emmanuel Kentzinger¹, Johan Buitenhuis², Sabine Pütter³, Mai Hussein Hamed¹, Nadine Seidel^4,1, Connie Meinke Bednarski¹, Oleg Petracic^1,4, and Thomas Brückel¹ — ¹Jülich Centre for Neutron Science JCNS-2, Forschungszentrum Jülich GmbH, Jülich, Germany — ²Institute for Biological Information Processes, Biomacro molecular Systems and Processes (IBI-4), Forschungszentrum Jülich GmbH, Jülich, Germany — ³Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH, Garching, Germany — ⁴Heinrich-Heine-University Düsseldorf, Faculty of Mathematics and Natural Sciences, Düsseldorf, Germany

The use of curved surfaces as substrates for thin film deposition induces lateral variation in film thickness, which allows variation in the deposited material properties. [Co/Pd]n multilayers with differen Co thicknesses were deposited on a flat silicon substrate, and densely packed two-dimensional arrays of silica nanospheres with different radii of curvature formed by improved drop-casting method [1]. Scanning electron microscopy, X-ray reflectivity (XRR), grazing incidence small angle X-ray scattering, SQUID and neutron reflectivity were used to characterise the obtained nanostructure. Compared to the flat multilayer, the cap multilayer shows a different anisotropy axis direction. A change in coercivity as a function of film thickness and radius of curvature is also observed.[1] A. Qdemat, et.al., RSC Adv., 10, 2020

Keywords: Thin film; Curved surfaces; Nanospheres; GISAXS; Polarized neutron reflectivity