Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9812328 | Thin Solid Films | 2005 | 6 Pages |
Abstract
Epitaxial CoxTi1âxO2 anatase thin films were grown on (001)LaAlO3 by a reactive RF magnetron co-sputter deposition with water vapor serving as the oxidant. The use of water as the oxygen source proves useful in growing oxygen-deficient, semiconducting CoxTi1âxO2 by reactive sputter deposition, with undoped and Co-doped TiO2 thin films showing n-type semiconductor behavior, with carrier concentrations of 1017-1018 cmâ 3. Magnetization measurements of CoxTi1âxO2 (x = 0.07) thin films reveal ferromagnetic behavior in M-H loop at room temperature with a saturation magnetization on the order of 0.7 Bohr magnetons/Co. X-ray photoemission spectrometry indicates that the Co cations are in the Co2+ valence state. However, chemical analysis of surface structure indicates that a significant fraction of the cobalt segregates into a Co-Ti-O phase. This suggests that the ferromagnetic moments may reside in oxygen-bound Co that is segregated from the majority anatase phase.
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Authors
B.-S. Jeong, Y.W. Heo, D.P. Norton, A.F. Hebard, J.D. Budai, Y.D. Park,