Half-Metallic Behavior in 2D Transition Metal Dichalcogenides Nanosheets by Dual-Native-Defects Engineering

Yun Tong, Yuqiao Guo, Kejun Mu, Huan Shan, Jun Dai, Yi Liu, Zhe Sun, Aidi Zhao, Xiao Cheng Zeng, Changzheng Wu, Yi Xie

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Two-dimensional transition metal dichalcogenides (TMDs) have been regarded as one of the best nonartificial low-dimensional building blocks for developing spintronic nanodevices. However, the lack of spin polarization in the vicinity of the Fermi surface and local magnetic moment in pristine TMDs has greatly hampered the exploitation of magnetotransport properties. Herein, a half-metallic structure of TMDs is successfully developed by a simple chemical defect-engineering strategy. Dual native defects decorate titanium diselenides with the coexistence of metal-Ti-atom incorporation and Se-anion defects, resulting in a high-spin-polarized current and local magnetic moment of 2D Ti-based TMDs toward half-metallic room-temperature ferromagnetism character. Arising from spin-polarization transport, the as-obtained T-TiSe1.8 nanosheets exhibit a large negative magnetoresistance phenomenon with a value of −40% (5T, 10 K), representing one of the highest negative magnetoresistance effects among TMDs. It is anticipated that this dual regulation strategy will be a powerful tool for optimizing the intrinsic physical properties of TMD systems.

Original languageEnglish (US)
Article number1703123
JournalAdvanced Materials
Volume29
Issue number40
DOIs
StatePublished - Oct 25 2017

Keywords

  • dual defects
  • ferromagnetism
  • half-metal
  • spin polarization
  • two dimensional

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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    Tong, Y., Guo, Y., Mu, K., Shan, H., Dai, J., Liu, Y., Sun, Z., Zhao, A., Zeng, X. C., Wu, C., & Xie, Y. (2017). Half-Metallic Behavior in 2D Transition Metal Dichalcogenides Nanosheets by Dual-Native-Defects Engineering. Advanced Materials, 29(40), [1703123]. https://doi.org/10.1002/adma.201703123