SQUID magnetometry combined with in-situ cyclic voltammetry: A new approach for studying the correlation between electrochemical processes and magnetic properties
Stefan Topolovec, Heinz Krenn, Stefan Landgraf, Roland Würschum
Institut für Materialphysik
10:20 - 10:40 Thursday 24 October 2013 HS II, Alte Technik The combination of magnetism and electrochemistry has attracted considerable attention in the last years. By designing a three-electrode electrochemical cell for operation in a commercial state-of-the-art SQUID magnetometer we have developed a new approach for studying the correlations between electrochemical processes and magnetic properties. This will be illustrated based on two issues: The tunability of the magnetic moment of porous nanophase systems by electrochemical charging and the electrodeposition of magnetic thin layers.
Using this setup we could show that the magnetic moment of -Fe2O3 [1] and Pt [2] nanoparticles can be varied reversible up to several percent by electrochemical charging. The observed variations are due to reversible redox reactions, respectively to electric field induced effects.
Furthermore, the cell was used to study the evolution of the absolute magnetic moment during the electrodeposition of magnetic thin layers. Thus, we could show that thin ferromagnetic Co layers have an enhanced magnetic moment compared to the bulk value.
[1] Topolovec, S.; Jerabek, P.; Szabó, D. V.; Krenn, H.; Würschum, R.: SQUID magnetometry combined with in situ cyclic voltammetry: A case study of tunable magnetism of γ-Fe₂O₃ nanoparticles. J. Magn. Magn. Mater. 329 (2013) 43.
[2] Steyskal, E.-M.; Topolovec, S.; Landgraf, S.; Krenn, H.; Würschum, R.: In situ monitoring magnetism and resistance of nanophase platinum upon electrochemical oxidation. Beilstein J. Nanotechnol. 4 (2013) 394.
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