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Room‐Temperature Ferromagnetic Insulating State in Cation‐Ordered Double‐Perovskite Sr<sub>2</sub>Fe<sub>1+</sub><i><sub>x</sub></i>Re<sub>1−</sub><i><sub>x</sub></i>O<sub>6</sub>Films
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 …