Concurrent transition of ferroelectric and magnetic ordering near room temperature

Kyung-Tae Ko, Min Hwa Jung, Qing He, Jin Hong Lee, Chang Su Woo, Kanghyun Chu, Jan Seidel, Byung-Gu Jeon, Yoon Seok Oh, Kee Hoon Kim, Wen-I Liang, Hsiang-Jung Chen, Ying-Hao Chu, Yoon Hee Jeong, Ramamoorthy Ramesh, Jae-Hoon Park () and Chan-Ho Yang ()
Additional contact information
Kyung-Tae Ko: POSTECH
Min Hwa Jung: POSTECH
Qing He: University of California
Jin Hong Lee: KAIST
Chang Su Woo: KAIST
Kanghyun Chu: KAIST
Jan Seidel: University of California
Byung-Gu Jeon: CeNSCMR, Seoul National University
Yoon Seok Oh: CeNSCMR, Seoul National University
Kee Hoon Kim: CeNSCMR, Seoul National University
Wen-I Liang: National Chiao-Tung University
Hsiang-Jung Chen: National Chiao-Tung University
Ying-Hao Chu: National Chiao-Tung University
Yoon Hee Jeong: POSTECH
Ramamoorthy Ramesh: University of California
Jae-Hoon Park: POSTECH
Chan-Ho Yang: KAIST

Nature Communications, 2011, vol. 2, issue 1, 1-8

Abstract: Abstract Strong spin-lattice coupling in condensed matter gives rise to intriguing physical phenomena such as colossal magnetoresistance and giant magnetoelectric effects. The phenomenological hallmark of such a strong spin-lattice coupling is the manifestation of a large anomaly in the crystal structure at the magnetic transition temperature. Here we report that the magnetic Néel temperature of the multiferroic compound BiFeO3 is suppressed to around room temperature by heteroepitaxial misfit strain. Remarkably, the ferroelectric state undergoes a first-order transition to another ferroelectric state simultaneously with the magnetic transition temperature. Our findings provide a unique example of a concurrent magnetic and ferroelectric transition at the same temperature among proper ferroelectrics, taking a step toward room temperature magnetoelectric applications.

Date: 2011
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DOI: 10.1038/ncomms1576

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