MN4 embedded graphene layers: Tunable decay rate of the RKKY interaction

Article

关键词: MAGNETIC-PROPERTIES;    FERROMAGNETISM;    FE;    APPROXIMATION;    EXCHANGE;    METALS;    CARBON;    ORDER;   

DOI  :  10.1103/PhysRevB.106.064407

来源: SCIE

【 摘 要 】

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. MN4 embedded graphene (MN4-G) layers, with 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 MN4-G layers with a special focus on the behavior of the indirect M-M exchange interactions and demonstrate that the MN4-G layers with M = Fe, Mn, and Co, are 2D anisotropic magnetic layers with Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction. By examining the electronic configurations of the M atoms for various M-M spacers, we demonstrate that the RKKY interaction in such layers are tunable and exhibit an unusual, prolonged decay (r(-n), with 0.5 <= n <= 2). In addition, we isnvestigate the influence of the CuN4 moiety in the graphene host, and show that, in contrary to the other MN4-G layers, the 2D CuN4-G layer behaves as decoupled one-dimensional spin chains, regardless of the spacer lengths.

【 授权许可】

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