Clusters and magnetism in epitaxial Co-doped TiO2 anatase
Clusters and magnetism in epitaxial Co-doped TiO2 anatase
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DOI：
10.1063/1.1556173
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发表时间：
2003-02
影响因子：
4
通讯作者：
S. Chambers;T. Droubay;Chong-Min Wang;A. S. Lea;R. Farrow;L. Folks;V. Deline;S. Anders
中科院分区：
文献类型：
--
作者：
S. Chambers;T. Droubay;Chong-Min Wang;A. S. Lea;R. Farrow;L. Folks;V. Deline;S. Anders
研究表明，在一定条件下，富Co的TiO_2纳米团簇在LaAl_3（001）衬底上通过氧等离子体辅助分子束外延生长的TiO_2纳米团簇上成核。在最极端的情况下，几乎所有的入射钴偏析的集群，产生纳米级的铁磁相，是不是铁磁在均匀的薄膜相同的钴浓度。必须仔细监测与连续外延膜生长同时的该相的成核，以避免得出关于膜结构的错误结论。
We show that under certain conditions, highly Co-enriched TiO2 anatase clusters nucleate on epitaxial TiO2 anatase grown on LaAlO3(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.