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Magnetic anisotropy of a single cobalt nanocluster
M Jamet1, W Wernsdorfer, C Thirion
1DPM-Université Claude Bernard-Lyon 1 et CNRS, 69622 Villeurbanne, France.
Physical Review Letters
|June 1, 2001
Abstract:
Using a new micro-SQUID setup, we investigate magnetic anisotropy in a single 1000-atom cobalt cluster. This system opens new fields in the characterization and understanding of the origin of magnetic anisotropy in such nanoparticles. For this purpose, we report three-dimensional switching field measurements performed on a 3 nm cobalt cluster embedded in a niobium matrix. We are able to separate the different magnetic anisotropy contributions and evidence the dominating role of the cluster surface.