Room-temperature giant magnetoresistance over one billion percent in a bare graphene nanoribbon device

Rui Qin, Jing Lu, Lin Lai, Jing Zhou, Hong Li, Qihang Liu, Guangfu Luo, Lina Zhao, Zhengxiang Gao, Wai Ning Mei, and Guangping Li
Phys. Rev. B 81, 233403 – Published 14 June 2010
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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.

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  • Received 30 March 2010

DOI:https://doi.org/10.1103/PhysRevB.81.233403

©2010 American Physical Society

Authors & Affiliations

Rui Qin1, Jing Lu1,*, Lin Lai1, Jing Zhou1, Hong Li1, Qihang Liu1, Guangfu Luo1,2, Lina Zhao3, Zhengxiang Gao1, Wai Ning Mei2, and Guangping Li4

  • 1State Key Laboratory of Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, People’s Republic of China
  • 2Department of Physics, University of Nebraska at Omaha, Omaha, Nebraska 68182-0266, USA
  • 3Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, China
  • 4SICAS Center, Lee Hall, SUNY Oneonta, Oneonta, New York 13820, USA

  • *jinglu@pku.edu.cn

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Issue

Vol. 81, Iss. 23 — 15 June 2010

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