title: SQUID magnetometry combined with in situ cyclic voltammetry: A case study of tunable magnetism of [Formula: see text]-Fe2O3nanoparticles.
abstract: SQUID magnetometry combined with in situ cyclic voltammetry by means of a three-electrode chemical cell opens up novel potentials for studying correlations between electrochemical processes and magnetic behaviour. The combination of these methods shows that the charge-induced variation of the magnetic moment of nanocrystalline maghemite ([Formula: see text]-Fe2O3) of about 4% strongly depends on the voltage regime of charging. Upon positive charging, the charge-induced variation of the magnetic moment is suppressed due to adsorption layers. The pronounced charge-sensitivity of the magnetic moment in the regime of negative charging may either be associated with a redox reaction or with charge-induced variations of the magnetic anisotropy or magnetoelastic coupling.
authors.affiliation: Institute of Materials Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.
authors.forename: Stefan
authors.initials: S
authors.lastname: Topolovec
authors.affiliation: Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria.
authors.forename: Peter
authors.initials: P
authors.lastname: Jerabek
authors.affiliation: Institute for Applied Materials-Materials Processing Technology, Karlsruhe Institute of Technology, P.O. Box 3640, 76021 Karlsruhe, Germany.
authors.forename: Dorothée Vinga
authors.initials: DV
authors.lastname: Szabó
authors.affiliation: Institute of Physics, University of Graz, Universitätsplatz 5, 8010 Graz, Austria.
authors.forename: Heinz
authors.initials: H
authors.lastname: Krenn
authors.affiliation: Institute of Materials Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria.
authors.forename: Roland
authors.initials: R
authors.lastname: Würschum
keywords: Charge-induced magnetism variation; In situ electrochemistry; Multifunctional property; Nanocrystalline material; SQUID magnetometry