Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Micro- and Nanostructured Materials (joint session MA/TT)

TT 7.5: Vortrag

Montag, 16. März 2020, 10:30–10:45, HSZ 403

Microscopic origin of improved magnetic fluid hyperthermia performance of CFO-Pd heterodimers: Element-specific investigations of structural, electronic, and magnetic characteristics — •S. Fatemeh Shams1, Detlef Schmitz2, Alevtina Smekhova2, Eugen Weschke2, Kai Chen2, Chen Luo2, Amir. H. Tavabi3, Sussane Pettinger4, Konrad Siemensmeyer2, Gil Westmeyer4, Rafal E. Dunin-Borkowski3, Florin Radu2, and Carolin Schmitz-Antoniak11Peter-Grünberg-Institut (PGI-6), Forschungszentrum Jülich, 52425 Jülich, Germany — 2Helmholtz-Zentrum Berlin für Materialien und Energie, 14109 Berlin, Germany — 3Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute, Forschungszentrum Jülich, 52425 Jülich, Germany — 4Institute of Biological and Medical Imaging (IBMI), Helmholtz Zentrum München, 85764 Neuherberg, Germany

Cobalt ferrite nanoparticles were synthesized and randomly decorated with approximately 2 wt.% of Pd particles. After careful structural and compositional characterization, X-ray absorption spectroscopy was used to investigate their element-specific magnetic properties. A significant increase in the effective spin and orbital magnetic moments of both the Fe and the Co ions was found upon decoration with Pd, leading to an increase in total magnetic moment per formula unit by 60% for the larger nanoparticles and by 200% for the smaller ones at 300 K. XMCD measurements show that the magnetic field dependence of the Co moment is much steeper at lower magnetic fields, leading to an enhanced maximum heating power in hyperthermia experiments.

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