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Title:Magnetism of wurtzite CoO nanoclusters
Authors:Ruairi Hanafin, Thomas Archer, and Stefano Sanvito, 2010
Abstract: The possibility that the apparent room-temperature ferromagnetism, often measured in Co-doped ZnO, is due to uncompensated spins at the surface of wurtzite CoO nanoclusters is investigated by means of a combination of density-functional theory and Monte Carlo simulations. We find that the critical temperature extracted from the specific heat systematically drops as the cluster size is reduced, regardless of the particular cluster shape. Furthermore the presence of defects, in the form of missing magnetic sites, further reduces TC. This suggests that even a spinodal decomposed phase is unlikely to sustain room-temperature ferromagnetism in ZnO:Co.
ICHEC Project:Multiferroic tunneling junctions
Publication:Phys. Rev. B 81, 054441 [7 pages]
URL: http://link.aps.org/doi/10.1103/PhysRevB.81.054441
Status: Published

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