中国物理B ›› 2016, Vol. 25 ›› Issue (2): 27304-027304.doi: 10.1088/1674-1056/25/2/027304
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
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)
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)
摘要: 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.
中图分类号: (Metal-insulator-semiconductor structures (including semiconductor-to-insulator))