Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Magnetic Thin Films II

MA 52.11: Vortrag

Freitag, 20. März 2015, 12:15–12:30, H 1012

In-situ thin-film electrodeposition in a SQUID magnetometer - a novel tool for studying the evolution of the magnetism during growth of Co films — •Stefan Topolovec1, Heinz Krenn2, and Roland Würschum11Institute of Materials Physics, Graz University of Technology, Graz, Austria — 2Institute of Physics, University of Graz, Graz, Austria

Recently magnetic films formed by electrodeposition have attracted considerable attention [1]. To monitor the evolution of the magnetic moment m during the electrodeposition of thin Co films, we have designed a 3-electrode electrochemical cell for operation in a commercial state-of-the-art SQUID magnetometer, which enables the simultaneous measurement of magnetization and cyclic voltammograms [2,3].

With this new in-situ technique, a precise cancellation of the background signal of the cell and substrate is possible. This gives direct experimental access to the magnetic moment which arises exclusively from the electrodeposited film.

In-situ measurement cycles during growth and subsequent dissolution of Co films of different thicknesses yield evidence of an enhanced magnetic moment in the regime of a few monolayers in agreement with results obtained from theory and measurements of circular dichroism (XMCD) [4].

[1] P. Allongue et al., Surf. Sci. 603 (2009) 1831.

[2] S. Topolovec et al., J. Magn. Magn. Mater. 329 (2013) 43.

[3] E.-M. Steyskal et al., Beilstein J. Nanotechnol. 4 (2013) 394.

[4] M. Tischer et al., Phys. Rev. Lett. 75 (1995) 1602.

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