Título:
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Strain-induced stabilization of new magnetic spinel structures in epitaxial oxide heterostructures.
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Autor/a:
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Rigato, Franco; Estradé Albiol, Sònia; Arbiol i Cobos, Jordi; Peiró Martínez, Francisca; Lüders, Ulrike Anne; Martí, X.; Sánchez Barrera, Florencio; Fontcuberta i Griñó, Josep
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Otros autores:
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Universitat de Barcelona |
Abstract:
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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. |
Materia(s):
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-Pel·lícules fines -Òxids -Propietats magnètiques -Thin films -Oxides -Magnetic properties |
Derechos:
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(c) Elsevier B.V., 2007
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Tipo de documento:
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Artículo Artículo - Versión aceptada |
Editor:
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Elsevier B.V.
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