Abstract
Using x-ray magnetic circular dichroism XMCD, x-ray absorption spectroscopy XAS, and
energy filtered transmission electron microscopy, we provide evidence for a heterogeneous Co
distribution in anatase Co:TiO2 magnetic semiconductor having a low Co concentration 1.4 at. %.
Multiplet structure due to Co2+ is observed in XAS spectra, but suppressed due to the coexistence
of metallic Co clusters and substitutional Co ions, whereas XMCD spectra resemble metallic Co.
The presence of Co2+ can be correlated with earlier observations of impurity band conduction and
Kondo behavior, whereas metallic Co clusters contribute to the ferromagnetism and anomalous Hall
effect.
| Original language | Undefined |
|---|---|
| Pages (from-to) | 0825061-0825063 |
| Number of pages | 3 |
| Journal | Applied physics letters |
| Volume | 96 |
| Issue number | 8 |
| DOIs | |
| Publication status | Published - 2010 |
Keywords
- EWI-19222
- METIS-276273
- IR-75550
Cite this
Lee, Y. J., de Jong, M. P., & Jansen, R. (2010). Magnetism and heterogeneity of Co in anatase Co:TiO2 magnetic semiconductor. Applied physics letters, 96(8), 0825061-0825063. https://doi.org/10.1063/1.3327805