Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 65: Poster 2
MA 65.8: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-OG1
Magnetization behavior and interactions of single magnetic nanodots — •Stefan Freercks1, Philipp Staeck1, Carsten Thönnißen1, Eva-Sophie Wilhelm1, Alexander Neumann1,2, and Hans Peter Oepen1 — 1Institut für Nanostruktur- und Festkörperphysik, Universität Hamburg, Germany — 2Institut für Medizintechnik, Universität zu Lübeck, Germany
We use the anomalous Hall-effect to measure the magnetization behavior of single magnetic nanodots with a uniaxial anisotropy perpendicular to the film plane in the blocked and the superparamagnetic state [1]. The nanodots and Hall bars are created by electron beam lithography and ion milling from thin Pt/Co/Pt multilayers. The diameter of the dots can be tuned down to 20 nm. Single nanodots as well as ensembles of a few nanodots have been investigated from 2.5 K to room temperature. The switching behavior of a single blocked nanodot has been studied as a function of field direction in three dimensions and differences to the model of Stoner-Wohlfarth are found [2]. In previous experiments interactions between nanodots were found [3]. Here the influence of the stray field of two blocked dots on the superparamagnetic switching behavior of a third dot is examined. Residual fields of the nanodots can be determined and give information on the internal dot structure. Funding by DFG via SFB 668 is gratefully acknowledged. [1] A. Neumann et al. Nano Letters. 13, p2199-2203, (2014). [2] E. C. Stoner and E. P. Wohlfarth, Philos. Trans. R. Soc. London, Ser. A 240, 599 (1948). [3] A. Neumann et al. New J. Phys. 16, 083012 (2014).