Karpan V M, Giovannetti G, Khomyakov P A, Talanana M, Starikov A A, Zwierzycki M, van den Brink J, Brocks G, Kelly P J
Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Phys Rev Lett. 2007 Oct 26;99(17):176602. doi: 10.1103/PhysRevLett.99.176602.
Based upon the observations (i) that their in-plane lattice constants match almost perfectly and (ii) that their electronic structures overlap in reciprocal space for one spin direction only, we predict perfect spin filtering for interfaces between graphite and (111) fcc or (0001) hcp Ni or Co. The spin filtering is quite insensitive to roughness and disorder. The formation of a chemical bond between graphite and the open d-shell transition metals that might complicate or even prevent spin injection into a single graphene sheet can be simply prevented by dusting Ni or Co with one or a few monolayers of Cu while still preserving the ideal spin-injection property.
（i）它们的面内晶格常数几乎完美匹配；（ii）它们的电子结构仅在一个自旋方向上在倒易空间中重叠，我们预测石墨与（111）面心立方或（0001）六方密排镍或钴之间的界面具有完美的自旋过滤特性。这种自旋过滤对粗糙度和无序相当不敏感。通过在镍或钴上覆盖一层或几层铜原子，在简单防止石墨与开放d壳层过渡金属之间形成可能使自旋注入到单个石墨烯片复杂化甚至阻止自旋注入的化学键的同时，仍能保持理想的自旋注入特性。
