Perfect Spin-filtering and Giant Magnetoresistance with Fe-terminated   Graphene Nanoribbon
  Spin-dependent electronic transport properties of Fe-terminated zig-zag graphene nanoribbons (zGNR) have been studied using first-principles transport simulations. The spin configuration of proposed zGNR junction can be controlled with external magnetic field, and the tunneling junction show MR>1000 at small bias and is a perfect spin-filter by applying uniform external magnetic filed at small bias. 
Chao Cao, Yan Wang, Hai-Ping Cheng and Jianzhong Jiang
cond-mat.mtrl-sci cond-mat.mes-hall