Abstract
We provide ab initio study on a spin valve device that is based on bare ferromagnetic zigzag-edged graphene nanoribbons. Giant magnetoresistance over one billion percent at room temperature is obtained, which is an ultrahigh magnetoresistance among graphene-related spin valve devices and seven orders of magnitude larger than the available experimental values. The orbital parity mismatching between the and bands and enhanced exchange splitting due to the dangling bond are two indispensable factors to generate this large magnetoresistance.
- Received 30 March 2010
DOI:https://doi.org/10.1103/PhysRevB.81.233403
©2010 American Physical Society