Tatiana M. Savchenko
(Swiss Light Sourse, Paul Scherrer Institut, CH-5232 Villigen, Switzerland)
Enhanced magnetism in 3d transition metal nanoparticles is of great interest for applications and for our fundamental understanding of nanomagnetism. However, despite considerable research efforts, the origin of anomalous magnetic properties in nanoparticles, such as enhanced magnetic anisotropy, are still poorly understood. Here, we combine X-ray photo-emission electron microscopy (X-PEEM) with high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) in order to correlate magnetism and microstructure of individual nanoparticles. Our data suggest that the magnetism of cobalt nanoparticles is determined by competing shape, surface, and structural contributions. Further, we find that this competition can easily mask the commonly expected size dependence of nanoparticles magnetic properties such as magnetic energy barriers.
Tatiana M. Savchenko
(Swiss Light Sourse, Paul Scherrer Institut, CH-5232 Villigen, Switzerland)
Dr
Armand Béché
(Electron Microscopy for Material Science, University of Antwerp, Belgium)
Mr
Martin Timm
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland)
David M. Bracher
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland)
G. Khadra
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France)
A. Tamion
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France)
F. Tournus
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France)
C. Albin
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France)
Veronique Dupuis
(Institut Lumière Matière, UMR5306 Université Lyon 1-CNRS, Université de Lyon, 69622 Villeurbanne cedex, France)
Prof.
J. Verbeeck
(Electron Microscopy for Material Science, University of Antwerp, Belgium)
Prof.
Frithjof Nolting
(Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland)
Armin Kleibert
(Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland)
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