Anionic Strategy-Modulated Magnetic Ordering in Super-elongated Multiferroic Epitaxial Films

Le résumé fourni par la source

Magnetic ordering of perovskite ferroelectric oxides is crucial for enhancing their stability and minimizing energy losses in magnetoelectric devices. However, inducing a transition from a magnetically disordered state to an ordered one remains a formidable challenge. Here, we propose a chemical sulfurization method that significantly enhances the magnetic ordering of multiferroic super-tetragonal phase BiFeO3 thin film. The out-of-plane and in-plane magnetization significantly increases after sulfurization, accompanied by a rotation of the magnetic easy axis. X-ray absorption spectroscopy and spherical aberration transmission electron microscopy reveal the reconfiguration of local electronic hybridization states, restructuring Fe–O hybridization from pyramid-like FeO5 to octahedral FeO6 geometries. This transformation is considered the root cause of the observed magnetic transition in the films. This sulfur-induced strategy for electronic hybridization reconfiguration is expected to break new ground, offering innovative methodologies for modulating perovskite oxides, two-dimensional ferroelectric films, and other ferromagnetic functional thin films. The authors present a feasible strategy of anion-induced strain engineering to regulate the lattice structure and properties of super-elongated BiFeO3 epitaxial films, revealing the correlations among lattice distortion, local electronic hybridization, and multiferroic properties.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.