Room-temperature giant magnetoresistance over one billion percent in a bare graphene nanoribbon device
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 σ and π∗ bands and enhanced exchange splitting due to the dangling bond are two indispensable factors to generate this large magnetoresistance.
- Publication:
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Physical Review B
- Pub Date:
- June 2010
- DOI:
- Bibcode:
- 2010PhRvB..81w3403Q
- Keywords:
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- 73.63.-b;
- 71.15.Mb;
- 71.20.Tx;
- 73.22.-f;
- Electronic transport in nanoscale materials and structures;
- Density functional theory local density approximation gradient and other corrections;
- Fullerenes and related materials;
- intercalation compounds;
- Electronic structure of nanoscale materials: clusters nanoparticles nanotubes and nanocrystals