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Appl. Phys. Express 1 (2008) 064004 (3 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Band-Gap Tuning in Magnetic Graphene Nanoribbons

Keisuke Sawada1, Fumiyuki Ishii1,2, and Mineo Saito1

1Division of Mathematical and Physical Science, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
2Research Institute for Computational Sciences, National Institute of Advanced Industrial Science and Technology, Umezono, Tsukuba, Ibaraki 305-8568, Japan

(Received March 31, 2008; accepted May 1, 2008; published online June 13, 2008)

By using non-collinear density-functional calculations, we clarified the magnetic states of zigzag-edged graphene nanoribbons (ZGNRs). In the novel non-collinear states that were found, the angle θ between the magnetic moments at the two edges were canted, i.e., 0 <θ< 180°, which was in contrast with the case of antiferromagnetic (AFM; θ=180°) and ferromagnetic (FM; θ=0°) states. As θ increased from 0 to 180°, the band gap increased and the total energy decreased. As a result, the AFM state was the ground state and had the maximum band gap, whereas the FM state had the highest energy and no band gap. As a result of the development of nanotechnology, the magnetic fields with canted directions between the two edges can be applied. Therefore, we expect that the spin canting angle θ can be varied by the introduction of magnetic fields, so the band gap of ZGNRs can be controlled. It is thus suggested that ZGNRs are potential candidates for spintronics applications. ©2008 The Japan Society of Applied Physics

URL: http://apex.ipap.jp/link?APEX/1/064004/
DOI: 10.1143/APEX.1.064004


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