Large magnetoresistance from long-range interface coupling in armchair graphene nanoribbon junctions
arXiv:1410.3567 · doi:10.1063/1.4904830
Abstract
In recent years, bottom-up synthesis procedures have achieved significant advancements in atomically-controlled growth of several-nanometer-long graphene nanoribbons with armchair-shaped edges (AGNRs). This greatly encourages us to explore the potential of such well-defined AGNRs in electronics and spintronics. Here, we propose an AGNR based spin valve architecture that induces a large magnetoresistance up to 900%. We find that, when an AGNR is connected perpendicularly to zigzag-shaped edges, the AGNR allows for long-range extension of the otherwise localized edge state. The huge magnetoresistance is a direct consequence of the coupling of two such extended states from both ends of the AGNR, which forms a perfect transmission channel. By tuning the coupling between these two spin-polarized states with a magnetic field, the channel can be destroyed, leading to an abrupt drop in electron transmission.
References in corpus (9)
- Energy Gaps in Graphene Nanoribbons
- Half-Metallic Graphene Nanoribbons
- Emergence of magnetism in graphene materials and nanostructures
- Tailoring the atomic structure of graphene nanoribbons by STM lithography
- Magnetic Correlations at Graphene Edges
- Etching and Narrowing of Graphene from the Edges
- Electronic transport properties of graphene nanoribbons
- I-V curve signatures of nonequilibrium-driven band gap collapse in magnetically ordered zigzag graphene nanoribbon two-terminal devices
- Large magnetoresistance from long-range interface coupling in armchair graphene nanoribbon junctions