Ferromagnetism in Fe-doped SnO2 thin films
COEY, JOHN MICHAEL DAVID
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Citation:Coey JMD, Douvalis AP, Fitzgerald CB, Venkatesan M 'Ferromagnetism in Fe-doped SnO2 thin films' in Applied Physics Letters, 84, (8), 2004, pp 1332 - 1334
Thin films grown by pulsed-laser deposition from targets of Sn0.95Fe0.05O2 are transparent ferromagnets with Curie temperature and spontaneous magnetization of 610 K and 2.2?A?m2?kg?1, respectively. The 57Fe Mossbauer spectra show the iron is all high-spin Fe3+ but the films are magnetically inhomogeneous on an atomic scale, with only 23% of the iron ordering magnetically. The net ferromagnetic moment per ordered iron ion, 1.8??B, is greater than for any simple iron oxide with superexchange interactions. Ferromagnetic coupling of ferric ions via an electron trapped in a bridging oxygen vacancy (F center) is proposed to explain the high Curie temperature.
Science Foundation Ireland
Publisher:American Physical Society
Series/Report no:Applied Physics Letters