▎ 摘　　要

We propose a spin-dependent device based on a zigzag-edge graphene nanoribbon (ZGNR) and external electric and magnetic fields. Theory predicts that the junction can be operated under magnetic excitation and edge disorder. Applying transverse electric and magnetic fields to even a small part of the ZGNR as a channel creates a high degree of spin polarization in the junction. In some energy ranges, the junction acts as a perfect spin-filter device, even in the presence of the edge disorders such as vacancies, as well as magnetic excitation such as longitudinal spin fluctuation. (C) 2012 American Institute of Physics. [doi:10.1063/1.3675267]