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 |
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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