Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films.
Borisevich, Albina Y
Cavill, Stuart A
Zhang, Kelvin HL
MacManus-Driscoll, Judith L
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
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Li, W., Zhu, B., He, Q., Borisevich, A. Y., Yun, C., Wu, R., Lu, P., et al. (2020). Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films.. Advanced science (Weinheim, Baden-Wurttemberg, Germany), 7 (1), 1901606. https://doi.org/10.1002/advs.201901606
Ultrathin epitaxial films of ferromagnetic insulators (FMIs) with Curie temperatures near room temperature are critically needed for use in dissipationless quantum computation and spintronic devices. However, such materials are extremely rare. Here, a room temperature FMI is achieved in ultrathin La0.9Ba0.1MnO3 films grown on SrTiO3 substrates via an interface proximity effect. Detailed scanning transmission electron microscopy images clearly demonstrate that MnO6 octahedral rotations in La0.9Ba0.1MnO3 close to the interface are strongly suppressed. As determined from in-situ X-ray photoemission spectroscopy, O K-edge X-ray absorption spectroscopy, and density functional theory, the realization of FMI state arises from a reduction of Mn eg bandwidth caused by the quenched MnO6 octahedral rotations. The emerging FMI state in La0.9Ba0.1MnO3 together with necessary coherent interface achieved with the perovskite substrate gives very high potential for future high performance electronic devices.
Leverhulme Trust (RPG-2015-017)
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External DOI: https://doi.org/10.1002/advs.201901606
This record's URL: https://www.repository.cam.ac.uk/handle/1810/298705