Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 46: Nanomaterials I

MM 46.6: Vortrag

Donnerstag, 29. März 2012, 11:30–11:45, H 1029

Electrochemical charging-induced variation of the magnetic moment of γ-Fe2O3 nanoparticles investigated by SQUID magnetometry with in-situ cyclic voltammetry — •Stefan Topolovec1, Peter Jerabek2, Dorothée Vinga Szabó3, Heinz Krenn2, and Roland Würschum11Inst. für Materialphysik, TU Graz, Graz, Austria — 2Inst. für Physik, Univ. Graz, Graz, Austria — 3Inst. für Angewandte Materialien - Werkstoffprozesstechnik, KIT, Karlsruhe, Germany

Recently, the reversible variation of the magnetic moment of γ-Fe2O3 nanoparticles by electrochemical charging could be demonstrated [1]. In order to study the underlying electrochemical processes in more detail, in-situ cyclic voltammetry in a SQUID magnetometer was performed in the present work. To obtain a conductive electrode, the insulating γ-Fe2O3 nanoparticles, which were prepared by microwave plasma synthesis, were intermixed with Pt nanoparticles and compacted to a porous pellet. The magnetic moment of the pellet was measured during recording cyclic voltammograms in a specially designed electrochemical cell. It turns out that the charge dependence of the magnetic moment is significantly affected by reduction and oxidation processes. The magnetic moment could be reversibly tuned up to several percent.

Financial support by the FWF Austrian Science Fund is appreciated (project S10405-N16).

[1] T. Traußnig et al., Phys. Status Solidi - Rapid Res. Lett. 5 (2011) 150.

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