57Co-emission M?ssbauer study on diluted magnetic semiconductor TiO2 films

摘要

Rutile-type Co x Ti1 − x O2 − d laser deposited on alumina substrate was studied after 57Co doping, using emission Mössbauer spectroscopy. It was found that although under certain conditions (i.e., which result in high conductivity) the thin rutile layers showed magnetooptical effect, the Mössbauer probe did not reveal any magnetic splitting, but showed paramagnetic Co3 + (Fe3 + ) in the films of low electric resistance. This supports that these samples have carrier induced magnetism which is also connected to the defect structure of the rutile films.