Spatial distribution and electronic state of Co in epitaxial anatase CoxTi1-xO2 thin films grown by reactive sputtering

Jeong, B.-S.; Heo, Y. W.; Norton, D. P.; Kelly, J. G.; Rairigh, R.; Hebard, A. F.; Budai, J. D.; Park, Y. D.
April 2004
Applied Physics Letters;4/5/2004, Vol. 84 Issue 14, p2608
Academic Journal
The magnetic and phase properties of CoxTi1-xO2 anatase thin films grown epitaxially on (001) LaAlO3 by a reactive rf magnetron cosputter deposition have been examined. CoxTi1-xO2 (x=0.07) thin films exhibit room-temperature ferromagnetism, as evidenced by hysteresis in M–H loop. Chemical mapping indicates segregation of the Co dopant atoms in these films. However, x-ray photoelectron spectroscopy suggests that the segregated Co is not metallic, but in the Co+2 state. These results are consistent with a segregated Ti–Co–O phase being responsible for the ferromagnetic behavior. © 2004 American Institute of Physics.


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