期刊
ACS NANO
卷 4, 期 4, 页码 2124-2128出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn901552b
关键词
tunable magnetism; ZnO nanoribbon; electric field; first-principles calculation
类别
资金
- 973 Program [(2007CB936204)]
- National NSF [10732040]
- Jiangsu Province NSF [BK2008042]
- Ministry of Education of China [705021, IRT0534]
- Fundamental Research Fund [JC200935]
- Northwestern Polytechnical University
We show by first-principles calculations that the magnetic moments of zigzag ZnO nanoribbons can be efficiently modulated by transverse electric fields. Depending on the field direction, the total magnetic moment in a zigzag ZnO nanoribbon can be remarkably enhanced or reduced and even completely quenched with increasing field over a threshold strength. However, in weak electric fields below the threshold, the magnetic moment in the zigzag ZnO nanoribbons nearly remains unchanged, which can be explained in terms of intrinsic transverse electric polarization and quantum confinement effects. The threshold electric field required to modulate the magnetic moment decreases significantly with increasing ribbon width, showing practical importance.
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