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Chin. Phys. B, 2016, Vol. 25(2): 027304    DOI: 10.1088/1674-1056/25/2/027304
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Effect of graphene tunnel barrier on Schottky barrier height of Heusler alloy Co2MnSi/graphene/n-Ge junction

Gui-fang Li(李桂芳), Jing Hu(胡晶), Hui Lv(吕辉), Zhijun Cui(崔智军), Xiaowei Hou(候晓伟), Shibin Liu(刘诗斌), Yongqian Du(杜永乾)
School of Electronics and Information, Northwestern Polytechnical University, Xi'an 710072, China
Abstract  We demonstrate that the insertion of a graphene tunnel barrier between Heusler alloy Co2MnSi and the germanium (Ge) channel modulates the Schottky barrier height and the resistance-area product of the spin diode. We confirm that the Fermi level is depinned and a reduction in the electron Schottky barrier height (SBH) occurs following the insertion of the graphene layer between Co2MnSi and Ge. The electron SBH is modulated in the 0.34 eV-0.61 eV range. Furthermore, the transport mechanism changes from rectifying to symmetric tunneling following the insertion. This behavior provides a pathway for highly efficient spin injection from a Heusler alloy into a Ge channel with high electron and hole mobility.
Keywords:  Co2MnSi/graphene/n-Ge junction      Fermi-level depinning      Schottky barrier height      metal-induced gap states (MIGS)  
Received:  17 September 2015      Revised:  16 November 2015      Accepted manuscript online: 
PACS:  73.40.Qv (Metal-insulator-semiconductor structures (including semiconductor-to-insulator))  
  73.30.+y (Surface double layers, Schottky barriers, and work functions)  
  72.25.Dc (Spin polarized transport in semiconductors)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61504107) and the Fundamental Research Funds for the Central Universities, China (Grant Nos. 3102014JCQ01059 and 3102015ZY043).
Corresponding Authors:  Gui-fang Li     E-mail:  gfli@nwpu.edu.cn

Cite this article: 

Gui-fang Li(李桂芳), Jing Hu(胡晶), Hui Lv(吕辉), Zhijun Cui(崔智军), Xiaowei Hou(候晓伟), Shibin Liu(刘诗斌), Yongqian Du(杜永乾) Effect of graphene tunnel barrier on Schottky barrier height of Heusler alloy Co2MnSi/graphene/n-Ge junction 2016 Chin. Phys. B 25 027304

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