Details

Autor(en) / Beteiligte

• GRIFFIN, K. A
• PAKHOMOV, A. B
• WANG, C. M
• HEALD, S. M
• KRISHNAN, Kannan M

Titel

Intrinsic ferromagnetism in insulating cobalt doped anatase TiO2

Ist Teil von

• Physical review letters, 2005-04, Vol.94 (15), p.157204.1-157204.4

Ort / Verlag

Ridge, NY: American Physical Society

Erscheinungsjahr

2005

Link zum Volltext

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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 Co:TiO(2) leads to new considerations for the origin of ferromagnetism in transition metal doped oxides.