Antiferromagnetic-Ferromagnetic Transition in Cubic Eutio3−Δfδ Thin Films Via Fluorine Substitution

Abstract

Here, we report a method that combines post-annealing and fluorination in a reducing atmosphere to achieve an electron redistribution in a EuTiO3−δFδ (FETO) film grown on SrTiO3 (STO) substrates. Differ from the traditional fluorine doping with strain effect, the fluorinated films treated at a higher temperature remain an unstrained cubic structure. Such fluorine substitution facilitates a substantial modification of the bonding and electronic structure within the films, thereby inducing a transition from antiferromagnetic to ferromagnetic behavior. This work provides a specific perspective on the role of anion doping in magnetic transitions through fluorine doping, particularly under the condition that the strain effect is effectively eliminated.

Keywords: Fluorination, Antiferromagnetic-ferromagnetic transformation, Electron redistribution