Room-temperature ferrimagnetism and polar phase in strained La2CoRuO6 films through 3d-4d cation engineering

Materials with room-temperature magnetic ordering and switchable polarization are essential for spintronic devices. Although 3 d transition metal oxides exhibit potential, their Curie temperature (TC) remains unsatisfactory, and coexistence of magnetic and polar order has not been realized in 4 d/5 d oxides. Here, through epitaxial strain and 3d−4d cation ordering engineering, a ferrimagnetic insulating state (TC ~ 623 K) is achieved in La2CoRuO6 films, coexisting with switchable short-range polar nanodomains. Atomic-scale investigations and density functional theory calculations reveal that compressive strain enhances lattice distortions. These distortions, combined with high-spin state of Co2+ ions and ordered B-site cations, significantly enhance Co-O-Ru antiferromagnetic superexchange, inducing the ferrimagnetic insulating state. Concurrently, the gradient BO6 octahedral rotations with inhomogeneous evolution trigger B-site ions’…