Abstract
Oxygen-deficient Europium monoxide EuO1−x shows a metal-to-insulator transition near the Curie temperature (TC). A systematic transport study of EuO1−x thin films as a function of exposure time in air reveals a gradually decreased TC from 140 K to 70 K as the concentration of the oxygen vacancies decreases, which is accompanied by a drastic increase in the resistance. We also find an unusual enhancement of magnetic anisotropy in the transport measurements, which results from the strong spin-orbit coupling at the interface between the film and substrate and possible presence of spin-textures like skyrmions in EuO1−x.
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