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Title: Strain-induced stabilization of new magnetic spinel structures in epitaxial oxide heterostructures.
Author: Rigato, Franco
Estradé Albiol, Sònia
Arbiol i Cobos, Jordi
Peiró Martínez, Francisca
Lüders, Ulrike Anne
Martí, X.
Sánchez Barrera, Florencio
Fontcuberta i Griñó, Josep
Keywords: Pel·lícules fines
Propietats magnètiques
Thin films
Magnetic properties
Issue Date: 2007
Publisher: Elsevier B.V.
Abstract: 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.
Note: Versió postprint del document publicat a:
It is part of: Materials Science and Engineering B-Solid State Materials for Advanced Technology, 2007, vol. 144, num. 1-3, p. 43-48
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ISSN: 0921-5107
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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