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Near-room temperature ferromagnetic behavior of single-atom-thick 2D iron in nanolaminated ternary MAX phases

Youbing LiEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,Jinghua LiangCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences 3 , Beijing 100049,Haoming DingEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,Jun LuDepartment of Physics, Chemistry, and Biology (IFM), Linköping University 4 , Linköping 58183,Xulin MuBeijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology 5 , Beijing 100124,Pengfei YanBeijing Key Laboratory of Microstructure and Properties of Solids, Beijing University of Technology 5 , Beijing 100124,Xiao ZhangEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,Ke ChenEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,Mian LiEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,Per O. Å. PerssonDepartment of Physics, Chemistry, and Biology (IFM), Linköping University 4 , Linköping 58183,Lars HultmanDepartment of Physics, Chemistry, and Biology (IFM), Linköping University 4 , Linköping 58183,Per EklundDepartment of Physics, Chemistry, and Biology (IFM), Linköping University 4 , Linköping 58183,Shiyu DuEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,Hongxin YangCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences 3 , Beijing 100049,Zhifang ChaiEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,Qing HuangEngineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences 1 , Ningbo, Zhejiang 315201,

2021en

ABI

Annotatsiya

Mn+1AXn (MAX) phases' nanolaminated ternary carbides or nitrides possess a unique crystal structure in which single-atom-thick “A” sublayers are interleaved by alternative stacking of a “Mn+1Xn” sublayer; these materials have been investigated as promising high-safety structural materials for industrial applications because of their laminated structure and metal and ceramic properties. However, limited of A-site elements in the definition of Mn+1AXn phases, it is a huge challenge for designing nanolaminated ferromagnetic materials with single-atom-thick two-dimensional iron layers occupying the A layers in the Mn+1AXn phases. Here, we report three new ternary magnetic Mn+1AXn phases (Ta2FeC, Ti2FeN, and Nb2FeC) with A sublayers of single-atom-thick two-dimensional iron through an isomorphous replacement reaction of Mn+1AXn precursors (Ta2AlC, Ti2AlN, and Nb2AlC) with a Lewis acid salts (FeCl2). All these Mn+1AXn phases exhibit ferromagnetic behavior. The Curie temperatures of the Ta2FeC and Nb2FeC Mn+1AXn phases are 281 and 291 K, respectively, i.e., close to room temperature. The saturation magnetization of these ternary magnetic MAX phases is almost two orders of magnitude higher than V2(Sn,Fe)C, whose A-site is partially substituted by Fe. Theoretical calculations on magnetic orderings of spin moments of Fe atoms in these nanolaminated magnetic Mn+1AXn phases reveal that the magnetism can be mainly ascribed to an intralayer exchange interaction of the two-dimensional Fe atomic layers. Owing to the richness in composition of Mn+1AXn phases, our work provides a large imaginary space for constructing functional single-atom-thick two-dimensional layers in materials using these nanolaminated templates.

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DOI: 10.1063/5.0059078

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