Designing cross-linked carbon nanotubes as perfect spin filter and spin valve

Abstract

By applying nonequilibrium Green’s functions in combination with density-function theory, the spin-dependent transport properties of cross-linked carbon nanotube spintronic devices are investigated. Our calculations show that the perfect spin filtering effect with the almost 100% spin polarization, and the magnetoresistance effect with a magnetoresistance ratio larger than 104% can be observed in the device. The occurrence of the perfect spin-filtering and magnetoresistance effects in the cross-linked carbon nanotube spintronic device provides the possibility for further improving the integration level of carbon nanotube networks. Moreover, the mechanisms for these interesting phenomena are suggested.