This title appears in the Scientific Report : 2003 

Giant Magnetic Anisotropy of Single Cobalt Atoms and Nanoparticles
Gambardella, P.
Rusponi, S. / Veronese, M. / Dhesi, S. S. / Grazioli, C. / Dallmeyer, R. J. / Cabria, I. / Zeller, R. / Dederichs, P. H. / Kern, K. / Carbone, C. / Brune, H.
Elektronische Eigenschaften; IFF-IEE
Theorie III; IFF-TH-III
Science, 300 (2003) S. 1130
Washington, DC [u.a.] American Association for the Advancement of Scienc 2003
1130
12750516
10.1126/science.1082857
Journal Article
Kondensierte Materie
Science 300
J
Please use the identifier: http://dx.doi.org/10.1126/science.1082857 in citations.
The isotropic magnetic moment of a free atom is shown to develop giant magnetic anisotropy energy due to symmetry reduction at an atomically ordered surface. Single cobalt atoms deposited onto platinum (111) are found to have a magnetic anisotropy energy of 9 millielectron volts per atom arising from the combination of unquenched orbital moments (1.1 Bohr magnetons) and strong spin-orbit coupling induced by the platinum substrate. By assembling cobalt nanoparticles containing up to 40 atoms, the magnetic anisotropy energy is further shown to be dependent on single-atom coordination changes. These results confirm theoretical predictions and are of fundamental value to understanding how magnetic anisotropy develops in finite-sized magnetic particles.