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Strain-induced stabilization of new magnetic spinel structures in epitaxial oxide heterostructures.
Rigato, Franco; Estradé Albiol, Sònia; Arbiol i Cobos, Jordi; Peiró Martínez, Francisca; Lüders, Ulrike Anne; Martí, X.; Sánchez Barrera, Florencio; Fontcuberta i Griñó, Josep
Universitat de Barcelona
We report here on the growth of NiFe2O4 epitaxial thin films of different thickness (3 nm ¿ t ¿ 32 nm) on single crystalline substrates having spinel (MgAl2O4) or perovskite (SrTiO3) structure. Ultrathin films, grown on any of those substrates, display a huge enhancement of the saturation magnetization: we will show that partial cationic inversion may account for this enhancement, although we will argue that suppression of antiparallel collinear spin alignment due to size-effects cannot be excluded. Besides, for thicker films, the magnetization of films on MAO is found to be similar to that of bulk ferrite; in contrast, the magnetization of films on STO is substantially lower than bulk. We discuss on the possible mechanisms leading to this remarkable difference of magnetization.
2012-08-31
Pel·lícules fines
Òxids
Propietats magnètiques
Thin films
Oxides
Magnetic properties
(c) Elsevier B.V., 2007
Article
info:eu-repo/semantics/acceptedVersion
Elsevier B.V.
         

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