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MA: Fachverband Magnetismus

MA 1: Magnetic nanoparticles (joint session MA/CPP)

MA 1.5: Vortrag

Montag, 12. März 2018, 10:30–10:45, H 0112

Structural and magnetic characterization of Pd-decorated cobalt ferrite multifunctional nanoparticles — •Seyedeh Fatemeh Shams¹, Detlef Schmitz², Alevtina Smekhova¹, Nataliya Svechkina¹, Konrad Siemensmeyer², Amir Hossein Tavabi³, Rafal E. Dunin-Borkowski³, and Carolin Schmitz-Antoniak¹ — ¹Peter Grünberg Institute (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany — ²Department for Quantum Phenomena in Novel Materials (EM-IQM), Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany — ³Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany

Pd-decorated CoFe2O4 multifunctional nanoparticles have been synthesized as a hybrid platform for simultaneous magnetic hyperthermia and photothermal therapeutic applications. Elemental and microstructural analyses have been conducted using TEM, HAADF STEM, EDS and ICP-OES. Experimental results confirm successful homogeneous Pd decoration on highly crystalline CoFe2O4 nanoparticles. Cations distributions, which have been inferred from XANES and XRD measurements, suggest the presence of considerable cation disorder, which increases with decreasing particle size for all of the samples. Magnetic properties of the nanoparticles have been investigated using XMCD and magnetometry. Intriguingly high-field XMCD reveals significantly enhanced total magnetic moments for both Fe and Co ions after Pd decoration. This substantially increased magnetization could lead to improved magnetic hyperthermia performance of the nanoparticles.