Direct magnetization-polarization coupling in BaCuF${}_4$ fluoride

Abstract

Despite oxides and some fluorides perovskites have emerged as prototypes of multiferroic and magnetoelectric materials, they have not impacted real devices. Unfortunately, their working temperatures are very low and the magnetoelectric coupling has been reported to be rather small. Herewith, we report from first-principles calculations an ideal magnetization reversal through polarization switching in BaCuF${}_4$ which, according to our results, could be achieved close to room temperature. We also show that this ideal coupling is driven by a soft mode that combines both, polarization and octahedral rotation. The later being directly coupled to the weak ferromagnetism of BaCuF${}_4$. This, added to its strong Jahn-Teller distortion and its orbital ordering, makes this material as a very appealing prototype for crystals in the $AB{X}_4$ family in multifunctional applications.

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• Incipient geometric lattice instability of cubic fluoroperovskites
• Benchmark for Ab Initio Prediction of Magnetic Structures based on Cluster-Multipole Theory
• Anharmonic stabilization of ferrielectricity in CuInP${}_2$Se${}_6$
• A large spin-splitting altermagnet designed from the hydroxylated MBene monolayer
• Revival of Layered Ferroelectrics in Thin Films
• Large geometric polarization and magnetic behavior in the multiferroic quasi-2D SrNiF${}_4$ fluoride
• Engineering of Ferroic Orders in Thin Films by Anionic Substitution