Geodesic
On the Nature of Ferromagnetism in Oxide Semiconductors Doped with 3D Elements
Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, Tome 154 (2012) no. 3, pp. 11-25

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The origin and mechanisms of ferromagnetism in the new class of magnetic materials, oxide-diluted magnetic semiconductors (O-DMS), are examined in the framework of the Stoner–Anderson model. Within the Green function formalism, a condition (the Stoner criterion) for nucleation of ferromagnetism is obtained for itinerant electrons in the narrow defect (vacancy) band, and an additional contribution caused by the interaction with 3d magnetic ions is derived. The “trigger” character of the transition to the ferromagnetic state in O-DMS is discussed in its dependence on the type and concentration of 3d magnetic impurity dopant. The results of the calculations are compared with the experimental data for the spontaneous magnetic moment in semiconducting titanium dioxide (TiO$_2$) doped with 3d magnetic ions and containing various concentrations of oxygen vacancies.
Keywords: oxide-diluted magnetic semiconductors, oxygen vacancies, narrow defect bands, Stoner criterion.
Mots-clés : ferromagnetism 
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     title = {On the {Nature} of {Ferromagnetism} in {Oxide} {Semiconductors} {Doped} with {3D} {Elements}},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
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A. A. Achkeev; I. R. Vakhitov; R. I. Khaibullin. On the Nature of Ferromagnetism in Oxide Semiconductors Doped with 3D Elements. Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, Tome 154 (2012) no. 3, pp. 11-25. http://geodesic.mathdoc.fr/item/UZKU_2012_154_3_a1/