Clusters and magnetism in epitaxial Co-doped TiO[sub 2] anatase

Chambers, S. A.; Droubay, T.; Wang, C. M.; Lea, A. S.; Farrow, R. F. C.; Folks, L.; Deline, V.; Anders, S.
February 2003
Applied Physics Letters;2/24/2003, Vol. 82 Issue 8, p1257
Academic Journal
We show that under certain conditions, highly Co-enriched TiO[SUB2] anatase clusters nucleate on epitaxial TiO[SUB2] anatase grown on LaAlO[SUB3](001) by oxygen plasma assisted molecular beam epitaxy. In the most extreme cases, virtually all incident Co segregates to the clusters, yielding a nanoscale ferromagnetic phase that is not ferromagnetic in homogeneous films of the same Co concentration. The nucleation of this phase simultaneous with continuous epitaxial film growth must be carefully monitored in order to avoid drawing false conclusions about the film structure.


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