Spin-dependent transport for armchair-edge graphene nanoribbons between ferromagnetic leads
文献类型：期刊论文
| 作者 | B. H. Zhou ; X. W. Chen ; B. L. Zhou ; K. H. Ding ; G. H. Zhou |
| 刊名 | Journal of Physics-Condensed Matter
 |
| 出版日期 | 2011 |
| 卷号 | 23期号:13 |
| 关键词 | magnetic tunnel-junctions magnetoresistance multilayers devices films |
| ISSN号 | 0953-8984 |
| 中文摘要 | We theoretically investigate the spin-dependent transport for the system of an armchair-edge graphene nanoribbon (AGNR) between two ferromagnetic (FM) leads with arbitrary polarization directions at low temperatures, where a magnetic insulator is deposited on the AGNR to induce an exchange splitting between spin-up and -down carriers. By using the standard nonequilibrium Green's function (NGF) technique, it is demonstrated that the spin-resolved transport property for the system depends sensitively on both the width of AGNR and the polarization strength of FM leads. The tunneling magnetoresistance (TMR) around zero bias voltage possesses a pronounced plateau structure for a system with semiconducting 7-AGNR or metallic 8-AGNR in the absence of exchange splitting, but this plateau structure for the 8-AGNR system is remarkably broader than that for the 7-AGNR one. Interestingly, an increase of the exchange splitting Delta suppresses the amplitude of the structure for the 7-AGNR system. However, the TMR is much enhanced for the 8-AGNR system under a bias amplitude comparable to the splitting strength. Further, the current-induced spin-transfer torque (STT) for the 7-AGNR system is systematically larger than that for the 8-AGNR one. The findings here suggest the design of GNR-based spintronic devices by using a metallic AGNR, but it is more favorable to fabricate a current-controlled magnetic memory element by using a semiconducting AGNR. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/30982]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | B. H. Zhou,X. W. Chen,B. L. Zhou,et al. Spin-dependent transport for armchair-edge graphene nanoribbons between ferromagnetic leads[J]. Journal of Physics-Condensed Matter,2011,23(13). |
| APA | B. H. Zhou,X. W. Chen,B. L. Zhou,K. H. Ding,&G. H. Zhou.(2011).Spin-dependent transport for armchair-edge graphene nanoribbons between ferromagnetic leads.Journal of Physics-Condensed Matter,23(13). |
| MLA | B. H. Zhou,et al."Spin-dependent transport for armchair-edge graphene nanoribbons between ferromagnetic leads".Journal of Physics-Condensed Matter 23.13(2011). |
入库方式： OAI收割
来源：金属研究所
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