Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2.

  title={Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2.},
  author={Kathleen A Griffin and Alec B Pakhomov and Cheng Wang and Steve M Heald and Kannan M. Krishnan},
  journal={Physical review letters},
  volume={94 15},
Using complementary experiments we show that the room temperature ferromagnetism observed in anatase Co:TiO(2) films is not carrier mediated, but coexists with the dielectric state. TEM and x-ray absorption spectroscopy reveal a solid solution of Co in anatase, where Co is not metallic but in the +2 state substituting for Ti. Measurements at 300 K yield a M(S) of 1.1 mu(B)/Co atom, while all films are highly insulating. The evidence of intrinsic ferromagnetism in the dielectric ground state of… CONTINUE READING

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