期刊
PHYSICAL REVIEW B
卷 81, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.233403
关键词
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资金
- NSFC [10774003, 10474123, 10434010, 90626223, 20731162012]
- MOST of China [2007CB936200]
- Fundamental Research Funds for the Central Universities
- MOE of China
- National Foundation for Fostering Talents of Basic Science [J0630311]
- Nebraska Research Initiative of USA [4132050400]
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 sigma and pi* bands and enhanced exchange splitting due to the dangling bond are two indispensable factors to generate this large magnetoresistance.
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