Atomic, molecular and chemical physics ferromagnetism
American Physical Society
Ruairi Hanafin, Thomas Archer and Stefano Sanvito, Magnetism of wurtzite CoO nanoclusters, Physical Review B, 81, 5, 2010, 054441
Physical Review B; 81; 5;
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
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