Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 84: Heterostructures and Interfaces
HL 84.10: Talk
Friday, March 24, 2017, 12:15–12:30, POT 151
Ultrathin Magnetite in Fe3O4/MgO super-lattices – resolving the origin of an enhanced, thin film magnetic moment — Ozhet Mauit1,2, •Karsten Fleischer1, Cormac Ó Coileáin1, Daniel S. Fox1, Christopher M. Smith1, Gulnar Sugurbekova2, Hongzhou Zhang1, and Igor V. Shvets1 — 1School of Physics and CRANN, Trinity College Dublin, The University of Dublin, Ireland — 2National Laboratory Astana, Nazarbayev University, Astana, Kazakhstan
The electrical, crystallographic and magnetic properties of ultra-thin magnetite (Fe3O4) have been studied in detail, by employing superlattice structures of Fe3O4/MgFe2O4 and Fe3O4/MgO on a variety of substrates. By careful analysis of their properties, the influence of substrate stoichiometry, Fe3O4 thin film thickness, antiphase boundaries on the magnetic properties can be separated. In particular, the controversial enhanced magnetic moment in ultra-thin films (<5 nm) was found to be related to the substrate stoichiometry, specifically the migration of oxygen vacancies into the Fe3O4 thin films. The multilayer concept can be employed with many other such systems and offers new methods of tuning the properties of thin magnetic oxides.