期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 131, 期 19, 页码 6874-6879出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja901586k
关键词
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资金
- National NSF [10732040]
- Jiangsu Province NSF [BK2009042]
- MOE [705021, IRT0534]
- Jiangsu Province Scientific Research Innovation [CX07B_064z]
We find through first-principles calculations that fluorine atoms topologically adsorbed on boron nitride nanotubes induce long-ranged ferromagnetic spin ordering along the tube, offering strong spin polarization around the Fermi level. The spin polarization and magnetic moment increase significantly with decreasing tube radius, even giving rise to half-metal when the tube diameter is reduced to 3.3 angstrom, while in a flat boron nitride sheet with the same topological fluorine arrangement the magnetic moment nearly disappears. This radius-dependent behavior is then developed into a local curvature modulation procedure to efficiently enhance or quench the ferromagnetic ordering, which enables the F-BNNTs to function as piezomagnetic nanotubes. These findings suggest a new route to facilitate the design of tunable spin devices.
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