Ferromagnetism in Fe-doped SnO[sub 2] thin films

Coey, J.M.D.; Douvalis, A.P.; Fitzgerald, C.B.; Venkatesan, M.
February 2004
Applied Physics Letters;2/23/2004, Vol. 84 Issue 8, p1332
Academic Journal
Thin films grown by pulsed-laser deposition from targets of Sn[sub 0.95]Fe[sub 0.05]O[sub 2] are transparent ferromagnets with Curie temperature and spontaneous magnetization of 610 K and 2.2 A m[sup 2] kg[sup -1], respectively. The [sup 57]Fe Mössbauer spectra show the iron is all high-spin Fe[sup 3+] 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 μ[sub 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. © 2004 American Institute of Physics.


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