Highly thermal-stable ferromagnetism by a natural composite

Tianyu Ma, Junming Gou, Shanshan Hu, Xiaolian Liu, Chen Wu, Shuai Ren, Hui Zhao, Andong Xiao, Chengbao Jiang, Xiaobing Ren () and Mi Yan ()
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Tianyu Ma: School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University
Junming Gou: School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University
Shanshan Hu: School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University
Xiaolian Liu: School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University
Chen Wu: School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University
Shuai Ren: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi’an Jiaotong University
Hui Zhao: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi’an Jiaotong University
Andong Xiao: Multi-disciplinary Materials Research Center, Frontier Institute of Science and Technology, Xi’an Jiaotong University
Chengbao Jiang: School of Materials Science and Engineering, Beihang University
Xiaobing Ren: Ferroic Physics Group, National Institute for Materials Science
Mi Yan: School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Key Laboratory of Novel Materials for Information Technology of Zhejiang Province, Cyrus Tang Center for Sensor Materials and Applications, Zhejiang University

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract All ferromagnetic materials show deterioration of magnetism-related properties such as magnetization and magnetostriction with increasing temperature, as the result of gradual loss of magnetic order with approaching Curie temperature TC. However, technologically, it is highly desired to find a magnetic material that can resist such magnetism deterioration and maintain stable magnetism up to its TC, but this seems against the conventional wisdom about ferromagnetism. Here we show that a Fe–Ga alloy exhibits highly thermal-stable magnetization up to the vicinity of its TC, 880 K. Also, the magnetostriction shows nearly no deterioration over a very wide temperature range. Such unusual behaviour stems from dual-magnetic-phase nature of this alloy, in which a gradual structural-magnetic transformation occurs between two magnetic phases so that the magnetism deterioration is compensated by the growth of the ferromagnetic phase with larger magnetization. Our finding may help to develop highly thermal-stable ferromagnetic and magnetostrictive materials.

Date: 2017
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DOI: 10.1038/ncomms13937

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