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MA: Fachverband Magnetismus
MA 39: Magnetic Particles / Clusters
MA 39.2: Talk
Friday, September 9, 2022, 09:45–10:00, H47
Room-temperature synthesis of AuFe solid solution nanoparticles and their transformation to Au/Fe Janus nanostructures — Maria V. Efremova1, Marina Spasova2, Markus Heidelmann3, Michael Farle2, and •Ulf Wiedwald2 — 1Department of Applied Physics, Eindhoven University of Technology, Netherlands — 2Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Germany — 3ICAN - Interdisciplinary Center for Analytics on the Nanoscale and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Germany
AuFe solid solution nanoparticles (NPs) are synthesized in ambient conditions by colloidal chemistry previously established for a Fe3O4−Au core-shell morphology [1]. These AuFe NPs preserve the fcc structure of Au with paramagnetic Fe ions incorporated. Interestingly, the solid solution is metastable at room temperature forming Fe-rich regions in the Au matrix during storage. In situ annealing experiments up to 700∘C in a transmission electron microscope and vibrating sample magnetometer leads to segregation of metallic Fe from the AuFe solid solution finally forming Au/Fe Janus NPs. The ferromagnetic bcc Fe grows epitaxially on low index fcc Au planes. The study facilitates the reassessment of possible applications of such NPs leading to a new material for magnetoplasmonics. First tests for biomedical applications are presented.
[1] M.V. Efremova, M. Spasova, M. Heidelmann, et al., Nanoscale 13, 10402 (2021).