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I10-Beamline for Advanced Dichroism - scattering	Two-dimensional ferromagnetic superlattices Shanshan Liu , Ke Yang , Wenqing Liu , Enze Zhang , Zihan Li , Xiaoqian Zhang , Zhiming Liao , Wen Zhang , Jiabao Sun , Yunkun Yang , Han Gao , Ce Huang , Linfeng Ai , Ping Kwan Johnny Wong , Andrew Thye Shen Wee , Alpha T N’diaye , Simon A. Morton , Xufeng Kou , Jin Zou , Yongbing Xu , Hua Wu , Faxian Xiu National Science Review DOI: 10.1093/nsr/nwz205 Diamond Proposal Number(s): [20748] Open Access Show Abstract ▼ Abstract: Mechanically-exfoliated two-dimensional ferromagnetic materials (2D FMs) were discovered to possess long-range ferromagnetic order and topologically nontrivial skyrmions in few-layers. However, owing to the dimensionality effect, such few-layer systems usually exhibit much lower Curie temperature (TC) compared to their bulk counterparts. It is therefore of great interest to explore effective approaches to enhance their TC, particularly in wafer-scale for practical applications. Here, we report an interfacial proximity-induced high-TC 2D FM Fe3GeTe2 (FGT) via A-type antiferromagnetic material CrSb (CS) which strongly couples to FGT. A superlattice structure of (FGT/CS)n, where n stands for the period of FGT/CS heterostructure, has been successfully produced with sharp interfaces by molecular-beam epitaxy on 2-inch wafers. By performing the elemental specific X-ray magnetic circular dichroism (XMCD) measurements, we have unequivocally discovered that TC of 4-layer Fe3GeTe2 can be significantly enhanced from 140 K to 230 K because of the interfacial ferromagnetic coupling. In the meanwhile, an inverse proximity effect occurs in the FGT/CS interface, driving the interfacial antiferromagnetic CrSb into a ferrimagnetic state as evidenced by a double-switching behavior in hysteresis loops and the XMCD spectra. Density functional theory calculations show that the Fe-Te/Cr-Sb interface is strongly FM coupled and doping of the spin-polarized electrons by the interfacial Cr layer gives rise to the TC enhancement of the Fe3GeTe2 films, in accordance with our XMCD measurements. Strikingly, by introducing rich Fe in 4-layer FGT/CS superlattice, TC can be further enhanced to near room temperature. Our results provide a feasible approach in enhancing the magnetic order of few-layer 2D FMs in wafer-scale and render opportunities for realizing realistic ultra-thin spintronic devices.	Dec 2019

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I10-Beamline for Advanced Dichroism - scattering

Two-dimensional ferromagnetic superlattices