Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Magnetic Particles / Clusters

MA 35.1: Vortrag

Mittwoch, 22. März 2017, 09:30–09:45, HSZ 101

Direct correlation of microscopic structure and magnetic properties of individual cobalt nanoparticles — •T. M. Savchenko¹, A. Béché², M. Timm¹, D. M. Bracher¹, G. Khadra³, A. Tamion³, F. Tournus³, C. Albin³, V. Dupuis³, J. Verbeeck², F. Nolting¹, and A. Kleibert¹ — ¹Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — ²Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium — ³Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France

Ever increasing data volumes demand memory devices with higher data storage density. In case of magnetic memory this requires nano-sized units with uniform magnetic properties. However, at the nanoscale a rich structural variety and defects are frequently found in materials which may cause significant dispersion of magnetic properties. A direct correlation of magnetism and atomic composition of nanostructures is so far achieved in spin-polarized scanning tunneling microscopy on surfaces. Here, we present a unique combination of magnetic and microstructural characterization of individual magnetic nanoparticles by means of X-ray photo-emission electron microscopy and high resolution scanning transmission electron microscopy. Distinct magnetic properties are found in cobalt nanoparticles with sizes ranging between 12 and 19 nm irrespective of size and actual microstructure. The results are discussed with respect to defects and morphology.