title: Large magnetoelectric coupling in magnetically short-range ordered Bi₅Ti₃FeO₁₅ film.
abstract: Multiferroic materials, which offer the possibility of manipulating the magnetic state by an electric field or vice versa, are of great current interest. However, single-phase materials with such cross-coupling properties at room temperature exist rarely in nature; new design of nano-engineered thin films with a strong magneto-electric coupling is a fundamental challenge. Here we demonstrate a robust room-temperature magneto-electric coupling in a bismuth-layer-structured ferroelectric Bi₅Ti₃FeO₁₅ with high ferroelectric Curie temperature of ~1000 K. Bi₅Ti₃FeO₁₅ thin films grown by pulsed laser deposition are single-phase layered perovskit with nearly (00l)-orientation. Room-temperature multiferroic behavior is demonstrated by a large modulation in magneto-polarization and magneto-dielectric responses. Local structural characterizations by transmission electron microscopy and Mössbauer spectroscopy reveal the existence of Fe-rich nanodomains, which cause a short-range magnetic ordering at ~620 K. In Bi₅Ti₃FeO₁₅ with a stable ferroelectric order, the spin canting of magnetic-ion-based nanodomains via the Dzyaloshinskii-Moriya interaction might yield a robust magneto-electric coupling of ~400 mV/Oe·cm even at room temperature.
authors.affiliation: 1] State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China [2] National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, Japan.
authors.forename: Hongyang
authors.initials: H
authors.lastname: Zhao
authors.affiliation: National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, Japan.
authors.forename: Hideo
authors.initials: H
authors.lastname: Kimura
authors.affiliation: Institute for Superconducting and Electronics Materials, University of Wollongong, Fairy Meadow, NSW 2519, Australia.
authors.forename: Zhenxiang
authors.initials: Z
authors.lastname: Cheng
authors.affiliation: National Institute for Materials Science, Sengen 1-2-1, Tsukuba 305-0047, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Osada
authors.affiliation: 1] Institute for Superconducting and Electronics Materials, University of Wollongong, Fairy Meadow, NSW 2519, Australia [2] Bragg Institute, ANSTO, Lucas Heights, New South Wales 2234, Australia.
authors.forename: Jianli
authors.initials: J
authors.lastname: Wang
authors.affiliation: Institute for Superconducting and Electronics Materials, University of Wollongong, Fairy Meadow, NSW 2519, Australia.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Wang
authors.affiliation: Institute for Superconducting and Electronics Materials, University of Wollongong, Fairy Meadow, NSW 2519, Australia.
authors.forename: Shixue
authors.initials: S
authors.lastname: Dou
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, China.
authors.forename: Jianding
authors.initials: J
authors.lastname: Yu
authors.affiliation: Institute of Engineering Innovation, School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Takao
authors.initials: T
authors.lastname: Matsumoto
authors.affiliation: Institute of Engineering Innovation, School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tohei
authors.affiliation: Institute of Engineering Innovation, School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Shibata
authors.affiliation: Institute of Engineering Innovation, School of Engineering, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Ikuhara