Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.16: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Quantitative Analysis of Magnetic Nanoparticles by Means of the Magnetic Force Microscopy — •Runbang Shao¹, Adrian Schillik², Benjamin Riedmüller¹, Ulrich Herr¹, and Berndt Koslowski² — ¹Institut für Mikro- und Nanomaterialien, Universität Ulm, Ulm, Deutschland — ²Institut für Festkörperphysik, Universität Ulm, Ulm, Deutschland

Magnetic force microscopy (MFM) is a powerful tool to analyze magnetic structures down to the nano-scale. Unlike macroscopic magnetic characterization techniques such as SQUID and VSM, which only reveal average magnetic properties of a large ensemble of nanoparticles, MFM is able to characterize a single nanoparticle with respect to magnitude and orientation of magnetization. The recently proposed pseudo-pole model [1], which assumes that the tip can be represented by an infinitely high cone covered homogeneously with dipoles pointing to the tip of the cone, allows quantitative analysis of the cantilever frequency shift versus tip-sample distance curves. Nano-composites of ferromagnetic Co nanoparticles made by inert gas condensation and SiOx cover layers with different layer thicknesses have been investigated. The frequency shift-distance curves agree well with the predictions from the pseudo-pole model, yielding detailed information about size and magnetization of the nanoparticles, as well as their depth below the film surface. It is further demonstrated that superparamagnetic nanoparticles can also be analyzed by this method. [1] Häberle, Thomas, et al. "Towards quantitative magnetic force microscopy: theory and experiment." New Journal of Physics 14.4 (2012): 043044.