Room-temperature ferromagnetic insulating state in highly cation-ordered epitaxial oxide double perovskite

Abstract

Ferromagnetic insulators (FMIs) are one of the most important components in developing dissipationless electronic and spintronic devices. However, since ferromagnetism generally accompanies metallicity, FMIs are innately rare to find in nature. Here, novel room-temperature FMI films are epitaxially synthesized by deliberate control of the ratio of two B-site cations in the double perovskite Sr2FeReO6. In contrast to the known ferromagnetic metallic phase in stoichiometric Sr2FeReO6, a FMI state with a high Curie temperature (Tc~400 K) and a large saturation magnetization (MS~1.8 μB/f.u.) is found in highly cation-ordered Fe-rich phases. The stabilization of the FMI state is attributed to the formation of extra Fe3+-Fe3+ and Fe3+-Re6+ bonding states, which originate from the excess Fe. The emerging FMI state by controlling cations in the epitaxial oxide perovskites opens the door to developing novel oxide quantum materials & heterostructures.

References in corpus (10)

• Electronic Structure of Sr_2FeMoO_6
• Spin transport in proximity induced ferromagnetic graphene
• Magnetic Insulator-Induced Proximity Effects in Graphene: Spin Filtering and Exchange Splitting Gaps
• Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films
• Strong ferromangnetism and weak antiferroamgnetism in double perovskites: Sr${}_2$Fe{/it M}O${}_6$ ({/it M}=Mo, W and Re)
• Magnetic Proximity Effect as a Pathway to Spintronic Applications of Topological Insulators
• Above 400 K Robust Perpendicular Ferromagnetic Phase in a Topological Insulator
• Electronic structure study of double perovskites $A_2$FeReO${}_6$ (A=Ba,Sr,Ca) and Sr${}_{2}M$MoO${}_6$ (M=Cr,Mn,Fe,Co) by LSDA and LSDA+U
• Epitaxy and magnetotransport of Sr_2FeMoO_6 thin films
• Quantum computing and single-qubit measurements using the spin filter effect

Cited by in corpus (7)

• Mapping the magnetic state as a function of anti-site disorder in Sm${}_2$NiMnO${}_6$ double perovskite thin films
• Strain-induced atomic-scale building blocks for ferromagnetism in epitaxial LaCoO3
• Tunable Ferromagnetism in LaCoO3 Epitaxial Thin Films
• Robust ferromagnetism in insulating La${}_2$NiMnO${}_6$ thin films
• Tunable Magnetic Properties in Sr${}_2$FeReO${}_6$ Double-Perovskite
• Robust electronic and tunable magnetic states in Sm${}_2$NiMnO${}_6$ ferromagnetic insulator
• Uncovering A Two-Dimensional Semiconductor with Intrinsic Ferromagnetism at Room Temperature