Magnetism of CoFe$_2$O$_4$ ultrathin films on MgAl$_2$O$_4$ driven by epitaxial strain - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Article Dans Une Revue Applied Physics Letters Année : 2013

Magnetism of CoFe$_2$O$_4$ ultrathin films on MgAl$_2$O$_4$ driven by epitaxial strain

Résumé

We report on the correlations between magnetic anisotropy and strain state in CoFe$_2$O$_4$ ultrathin films grown on MgAl$_2$O$_4$(100) and MgAl$_2$O$_4$(111) substrates. By local strain analysis using the geometric phase method, a significant in-plane compressive strain is observed for the (001) orientation while a full relaxation is detected for the (111) orientation. The relaxation process in CoFe$_2$O$_4$(111) layers induces interface dislocations and a large amount of antiphase boundaries while a pseudomorphic growth is observed for the (001) direction, decreasing significantly the density of antiphase boundaries. By comparing the magnetoelastic energy terms, the correlation between strain state and resultant magnetization is discussed.
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Dates et versions

cea-01481038 , version 1 (13-02-2018)

Identifiants

Citer

Christophe Gatel, Bénédicte Warot-Fonrose, S. Matzen, J.-B. Moussy. Magnetism of CoFe$_2$O$_4$ ultrathin films on MgAl$_2$O$_4$ driven by epitaxial strain. Applied Physics Letters, 2013, 103, pp.092405. ⟨10.1063/1.4819178⟩. ⟨cea-01481038⟩
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