期刊
NANO RESEARCH
卷 13, 期 12, 页码 3396-3402出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-020-3027-y
关键词
silicene; germanene; 2D ferromagnetism; X-ray magnetic circular dichroism (XMCD); monolayer
类别
资金
- National Research Center (NRC) Kurchatov Institute [1359]
- Russian Science Foundation [19-19-00009, 20-79-10028]
- President's scholarship [SP 1398.2019.5]
- Russian Science Foundation [19-19-00009, 20-79-10028] Funding Source: Russian Science Foundation
Two-dimension (2D) magnets have recently developed into a class of stoichiometric materials with prospective applications in ultra-compact spintronics and quantum computing. Their functionality is particularly rich when different magnetic orders are competing in the same material. Metalloxenes REX2(RE = Eu, Gd; X = Si, Ge), silicene or germanene - heavy counterparts of graphene - coupled with a layer of rare-earth metals, evolve from three-dimension (3D) antiferromagnets in multilayer structures to 2D ferromagnets in a few monolayers. This evolution, however, does not lead to fully saturated 2D ferromagnetism, pointing at a possibility of coexisting/competing magnetic states. Here, REX(2)magnetism is explored with element-selective X-ray magnetic circular dichroism (XMCD). The measurements are carried out for GdSi2, EuSi2, GdGe2, and EuGe(2)of different thicknesses down to 1 monolayer employing K absorption edges of Si and Ge as well as M and L edges of the rare-earths. They access the magnetic state in REX(2)and determine the seat of magnetism, orbital, and spin contributions to the magnetic moment. High-field measurements probe remnants of the bulk antiferromagnetism in 2D REX2. The results provide a new platform for studies of complex magnetic structures in 2D materials.
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