Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 31: Magnetic Imaging

MA 31.3: Talk

Wednesday, March 28, 2012, 15:30–15:45, BH 243

New approach for the magnetic characterization of isolated nanoparticles with nanometer lateral resolution — •Stephan Block¹ and Christiane A. Helm² — ¹ZIK HIKE - Zentrum für Innovationskompetenz Humorale Immunreaktionen bei kardiovaskulären Erkrankungen, Fleischmannstr. 42 - 44, D-17487 Greifswald, Germany — ²Institut für Physik, Ernst-Moritz-Arndt Universität, Felix-Hausdorff-Str. 6, D-17487 Greifswald, Germany

We present a new atomic force microscopy (AFM) method, which allows the simultaneous measurement of magnetic and geometric properties of nm-sized objects (nanoparticles, e.g. colloids or clusters). Basically, an oscillating magnetic field is applied to the sample and the surface magnetization is probed using a magnetic AFM-tip. Spatial changes of the magnetic flux density affect the vibration amplitude and thus, (dynamic) magnetic properties of the surface can be determined with lateral resolution of few nanometers. We will give a brief introduction of the measurement principles and evaluate the feasibility by characterizing isolated diamagnetic and superparamagnetic nanoparticles on the nm-scale. Hence, it becomes possible to distinguish different materials during AFM measurements by their magnetism (e.g. superparamagnetism or diamagnetism).