Large magnetoelectric coupling in magnetically short-range ordered Bi 5 Ti3 FeO15 film

Hongyang Zhao, Hideo Kimura, Zhenxiang Cheng, Minoru Osada, Jianli Wang, Xiaolin Wang, Shixue Dou, Yan Liu, Jianding Yu, Takao Matsumoto, Tetsuya Tohei, Naoya Shibata, Yuichi Ikuhara

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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 Bi 5 Ti 3 FeO 15 with high ferroelectric Curie temperature of ∼1000K. Bi5 Ti3 FeO15 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 ∼620K. In Bi5 Ti3 FeO15 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 ∼400mV/Oe·cm even at room temperature.

Original languageEnglish
Article number5255
JournalScientific Reports
Volume4
DOIs
Publication statusPublished - 2014 Jun 11
Externally publishedYes

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    Zhao, H., Kimura, H., Cheng, Z., Osada, M., Wang, J., Wang, X., Dou, S., Liu, Y., Yu, J., Matsumoto, T., Tohei, T., Shibata, N., & Ikuhara, Y. (2014). Large magnetoelectric coupling in magnetically short-range ordered Bi 5 Ti3 FeO15 film. Scientific Reports, 4, [5255]. https://doi.org/10.1038/srep05255