Tatiana Savchenko
(PSI - Paul Scherrer Institut)
Anomalous magnetic properties in 3d transition metal nanoparticles are often observed, but are still poorly understood. Here, we combine X-ray photo-emission electron microscopy with high-angle annular dark-field scanning transmission electron microscopy in order to correlate magnetism and microstructure of individual nanoparticles. The data are compared to simulated STEM images and atomistic spin dynamic simulations. Besides single crystalline fcc cobalt nanoparticles, we consider nanoparticles containing structural defects such as stacking faults being observed experimentally and evaluate magnetic energy barriers and spontaneous magnetization axes. Experiment and simulation suggest that the magnetic properties of cobalt nanoparticles are determined by a complex competition of shape, surface, and structural contributions. In this contribution we will discuss simulated results with respect to the experimental data.
Tatiana Savchenko
(PSI - Paul Scherrer Institut)
Dr
Armand Béché
(Electron Microscopy for Material Science, University of Antwerp)
Dr
Ivan Lobato
(Electron Microscopy for Material Science, University of Antwerp)
Dr
Richard Evans
(Department of Physics, University of York)
Dr
Roberto Moreno Ortego
(Department of Physics, University of York)
Dr
Peter M. Derlet
(Paul Scherrer Institute)
Mr
Martin Timm
(Photon Science Division, Paul Scherrer Institut)
David M. Bracher
(Paul Scherrer Institut)
Mr
Ghassan Khadra
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon)
Dr
Alexandre Tamion
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon)
Mr
Florent Tournus
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon)
Mr
Clement Albin
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon)
Dr
Véronique Dupuis
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon)
Dr
Johan Verbeeck
(Electron Microscopy for Material Science, University of Antwerp)
Prof.
Frithjof Nolting
(Photon Science Division, Paul Scherrer Institut)
Dr
Armin Kleibert
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen)
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