In a recent work, we have shown that chemically synthesized Sn1-xCoxO2 nanoscale powders with x = 0.01 are ferromagnetic at room-temperature when prepared by annealing the reaction precipitate in the narrow temperature window of 350 to 600 °C. Combined high resolution x-ray photoelectron spectroscopy and magnetometry measurements on as-prepared and Ar? ion sputtered samples showed that a uniform distribution of Co observed in the 350-600 °C annealed Sn0.99Co0.01O2 samples is essential to produce stable ferromagnetism, while surface segregation of the dopant atoms in samples annealed at >600 °C destroys it.
Revised: April 7, 2011 |
Published: July 17, 2006
Citation
Punnoose A., M.H. Engelhard, and J.S. Hays. 2006.Dopant Distribution, Oxygen Stoichiometry and Magnetism of Nanoscale Sn0.99Co0.01O2.Solid State Communications 139.PNNL-SA-42658.doi:10.1016/j.ssc.2005.09.040