Density of states of magnetic substitutional impurity-doped graphene in the paramagnetic and ferromagnetic phases

We reveal the effects of magnetic substitutional impurities on the density of states (DOS) of a graphene monolayer through the s-f model as well as coherent potential approximation. We show that the magnetic exchange interaction between the itinerant electrons in graphene and magnetic moments leads to ferromagnetic order and spin-splitting band below Curie temperature, which substantially affect the DOS. Furthermore, ferromagnetic graphene exhibits metallic behavior owing to the strong s-f exchange leading to the appearance of a sharp quasiparticle peak near the Fermi level. These phenomena, along with the gaps appearing in the DOS open prospects for new applications in spintronics and optics. © 2013 Elsevier BY. All rights reserved