XPS investigations of transition metal doped oxide semiconductors
EMSL Project ID
9995
Abstract
In a recent paper, accepted for publication in Applied Physics Letters, we have shown that tin dioxide when doped with less than or equal to 1% cobalt produces room temperature ferromagnetism. However, this ferromagnetism was completely distroyed when the doping increased to >1%. Even the low doped ferromagnetic Sn1-xCoxO2 samples showed significant variation in the magnetization, coercivity and remenance with changes in the preparation conditions. We plan to investigate any changes in the oxidation state of Co as a function of the doping concentration and preparation conditions. These studies will later on be extended to other transition metals such as Fe, Cr, Ni and Mn as well as other host systems including ZnO, ITO and TiO2.
Project Details
Project type
Exploratory Research
Start Date
2004-07-06
End Date
2007-01-13
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Hays J, A Thurber, KM Reddy, A Punnoose, and MH Engelhard. 2006. "Development and Processing Temperature Dependence of Ferromagnetism in Zn0.98Co0.02O." Journal of Applied Physics 99(8):Art. no. 08M123.
Punnoose A, J Hays, A Thurber, MH Engelhard, RK Kukkadapu, CM Wang, V Shutthanandan, and S Thevuthasan. 2005. "Development of high-temperature ferromagnetism in SnO2 and paramagnetism in SnO by Fe doping." Virtual Journal of Nanoscale Science & Technology 12(7).