SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 31: Functional Antiferromagnetism II

MA 31.8: Vortrag

Mittwoch, 29. März 2023, 17:00–17:15, HSZ 04

Ferromagnetism and Ferroelectricity in a Superlattice of Antiferromagnetic Perovskite Oxides Without Ferroelectric Polarization — •Avijeet Ray, Paresh C. Rout, and Udo Schwingenschlögl — Physical Sciences and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia

Using density functional theory with onsite Coulomb interaction, we study the structural, electronic, and magnetic properties of the SrCrO₃/YCrO₃ superlattice and their dependence on epitaxial strain. We discover that the superlattice adopts an A-type antiferromagnetic (A-AFM) ordering in contrast to its constituents (SrCrO₃: C-AFM; YCrO₃: G-AFM) and retains it under compressive strain while becoming ferromagnetic (5 µ_B per formula unit) at +1% strain. The obtained ferroelectric polarization is significantly higher than that of the R₂NiMnO₆/La₂NiMnO₆ (R = Ce to Er) series of superlattices [Nat. Commun. 5, 4021 (2014)] due to a large difference between the antipolar displacements of the Sr and Y cations. The superlattice is a hybrid-improper multiferroic material with a spontaneous ferroelectric polarization (13.5 µC/cm²) approaching that of bulk BaTiO₃ (19 µC/cm²). In addition, the charge-order-driven p-type semiconducting state of the ferromagnetic phase (despite the metallic nature of SrCrO₃) is a rare property and interesting for spintronics. Monte Carlo simulations demonstrate a magnetic critical temperature of 90 K for the A-AFM phase without strain and of 115 K for the ferromagnetic phase at +5% strain, for example.