期刊
ADVANCED MATERIALS
卷 29, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201703123
关键词
dual defects; ferromagnetism; half-metal; spin polarization; two dimensional
类别
资金
- National Basic Research Program of China [2015CB932302]
- Natural Science Foundation of China [U1432133, 21501164, 1162163, U1632154]
- National Program for support of Top-notch Yong Professionals
- Anhui Provincial Natural Science Foundation [1608085QA08]
- Fundamental Research Funds for the Central Universities [WK2060190084, WK2310000055, WK2340000065]
- Hefei Center for physical Science and Technology
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.
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