Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.90: Poster

Dienstag, 13. März 2018, 09:30–13:00, Poster A

Room-temperature antiferromagnetic order in individual goethite nanoparticles — •David M. Bracher¹, Tatiana M. Savchenko¹, Marcus Wyss², Giorgia Olivieri³, Matthew A. Brown³, Frithjof Nolting¹, Martino Poggio², and Armin Kleibert¹ — ¹Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland — ²Department of Physics and Astronomy, University of Basel, CH-4056 Basel, Klingelberstrasse 82, Switzerland — ³Laboratory for Surface Science and Technology, Department of Materials ETH Zürich, CH-8093,HCI G543

Nanoscaled antiferromagnets are of profound interest for future spintronic devices and novel materials. The absence of effective magnetic moments renders the investigation of antiferromagnetic material at the nanoscale very challenging. We tackle this issue by combining temperature- and orientation-dependent X-ray linear dichroism (XLD) spectromicroscopy by means of X-ray photoemission electron microscopy with scanning electron microscopy (SEM). The temperature dependen XLD signal of the individual goethite (α-FeOOH) nanoparticles suggest a mostly reversible magnetic phase transition around the Néel temperature (TN=400 K) of bulk goethite despite of the polycrystalline structure of nanoparticles. Comparing the spatially resolved XLD spectra with SEM images allows us to correlate the magnetic properties with the morphology of individual goethite nanoparticles.