2002/03/31 by S. R. Shinde, Satishchandra Ogale, S. B. Ogale +14 · 4 citations
Chemistry · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Anatase #Chemistry #Condensed matter physics #Curie temperature #Doping #Electronic and Structural Properties of Oxides #Ferromagnetism #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic semiconductor #Magnetization #Materials science #Optoelectronics #Photocatalysis #Physics #ZnO doping and properties #cond-mat
paper · pdf · doi:10.1103/physrevb.67.115211
14 pages + 9 figures
arxiv created 2002/12/12 · openalex publication_date 2003/03/31 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Pulsed laser deposited films of Co-doped anatase TiO2 are examined for Co substitutionality, ferromagnetism, transport, magnetotransport, and optical properties. Our results show limited solubility (up to \ensuremath∼2%) of Co in the as-grown films and formation of Co clusters thereafter. For the Ti0.93Co0.07O_2\ensuremath-\ensuremathδ sample, which exhibits a Curie temperature (TC) over 1180 K, we find the presence of 20--50 nm Co clusters as well as a small concentration of Co incorporated into the remaining matrix. After being subjected to the high-temperature anneal during the first magnetization measurement, the very same sample shows a TC\ensuremath∼650K and almost full matrix incorporation of Co. This TC is close to that of as-grown Ti0.99Co0.01O_2\ensuremath-\ensuremathδ sample (\ensuremath∼700 K). The transport, magnetotransport, and optical studies also reveal interesting effects of the matrix incorporation of Co. These results are indicative of an intrinsic Ti_1\ensuremath-xCoxO_2\ensuremath-\ensuremathδ diluted magnetic semiconductor with TC of about 650--700 K.