Year: 2022
Type: article
Abstract: One of the most important tasks in the development of high-performance spintronic devices is the preparation of two-dimensional (2D) magnetic layers with long-range exchange interactions. ${\mathrm{MN}}_{4}$ embedded graphene $({\mathrm{MN}}_{4}\text{\ensuremath{-}}\mathrm{G})$ layers, with $\mathrm{M}$ being transition metal elements, are experimentally accessible 2D layers which exhibit interesting magnetic properties. In this paper, by employing the spin-polarized density functional theory (SP-DFT), we study ${\mathrm{MN}}_{4}\text{\ensuremath{-}}\mathrm{G}$ layers with a special focus on the behavior of the indirect $\mathrm{M}\text{\ensuremath{-}}\mathrm{M}$ exchange interactions and demonstrate that the ${\mathrm{MN}}_{4}\text{\ensuremath{-}}\mathrm{G}$ layers with $\mathrm{M}=\mathrm{Fe}$, Mn, and Co, are 2D anisotropic magnetic layers with Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. By examining the electronic configurations of the $\mathrm{M}$ atoms for various $\mathrm{M}\text{\ensuremath{-}}\mathrm{M}$ spacers, we demonstrate that the RKKY interaction in such layers are tunable and exhibit an unusual, prolonged decay (${r}^{\ensuremath{-}n}$, with $0.5\ensuremath{\le}n\ensuremath{\le}2)$. In addition, we isnvestigate the influence of the ${\mathrm{CuN}}_{4}$ moiety in the graphene host, and show that, in contrary to the other ${\mathrm{MN}}_{4}\text{\ensuremath{-}}\mathrm{G}$ layers, the 2D ${\mathrm{CuN}}_{4}\text{\ensuremath{-}}\mathrm{G}$ layer behaves as decoupled one-dimensional spin chains, regardless of the spacer lengths.
Authors: Mahnaz Rezaei, Jahanfar Abouie, Fariba Nazari
Institution: Institute for Advanced Studies in Basic Sciences
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G3609575769, G8601392100
OpenAlex ID: W4289780666