TY - JOUR
T1 - Interface Engineered Room-Temperature Ferromagnetic Insulating State in Ultrathin Manganite Films
AU - Li, Weiwei
AU - Zhu, Bonan
AU - He, Qian
AU - Borisevich, Albina Y.
AU - Yun, Chao
AU - Wu, Rui
AU - Lu, Ping
AU - Qi, Zhimin
AU - Wang, Qiang
AU - Chen, Aiping
AU - Wang, Haiyan
AU - Cavill, Stuart A.
AU - Zhang, Kelvin H.L.
AU - MacManus-Driscoll, Judith L.
N1 - © 2019 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim.
PY - 2020/1/8
Y1 - 2020/1/8
N2 - 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 the 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.
AB - 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 the 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.
KW - ABO perovskite oxides
KW - ferromagnetic insulators
KW - interface engineering
KW - manganite thin films
KW - octahedral proximity effect
UR - http://www.scopus.com/inward/record.url?scp=85074842609&partnerID=8YFLogxK
U2 - 10.1002/advs.201901606
DO - 10.1002/advs.201901606
M3 - Article
AN - SCOPUS:85074842609
SN - 2198-3844
VL - 7
JO - Advanced Science
JF - Advanced Science
IS - 1
M1 - 1901606
ER -
