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Instruments / Technical Area	Publication Details	Published
I10-Beamline for Advanced Dichroism	Charge‐transfer‐induced multivalent states with resultant emergent magnetism in transition‐metal oxide heterostructures Wei Niu , Yue‐wen Fang , Xiaoqian Zhang , Yakui Weng , Yongda Chen , Hui Zhang , Yulin Gan , Xiao Yuan , Shengjie Zhang , Jiabao Sun , Yile Wang , Lujun Wei , Yongbing Xu , Xuefeng Wang , Wenqing Liu , Yong Pu Advanced Electronic Materials 7 DOI: 10.1002/aelm.202000803 Diamond Proposal Number(s): [20748] Show Abstract ▼ Abstract: Transition‐metal oxide (TMO) heterostructures provide fertile grounds for creating and manipulating intriguing properties and functionalities. At the interface of TMO heterostructures, electronic reconstructions generally occur via charge transfer and lead to an extraordinary spectrum of emergent phenomena but unattainable in their bulk constituents. However, the basic mechanism of charge transfer at the interface is not fully determined or even understood in heterostructures, which may hide the underlying mechanisms and intriguing physics. Herein, an intrinsic charge transfer and resultant exotic ferromagnetism are unambiguously observed in the heterostructures between the nonmagnetic LaCoO3 (LCO) and SrTiO3 (STO). Combining element‐specific X‐ray absorption spectroscopy and atomic multiplet fitting, direct evidence of charge transfer‐induced multivalence of cobalt ions, interactions of which would contribute to the novel magnetism beyond the intuition, in concert with first‐principles density‐functional‐theory calculations, is demonstrated. Beyond LCO/STO system, a more broadly applicable principle for the heterostructures between 3d TMO and STO where charge transfer and resultant multivalence or conducting interfaces are coexistent is establish. This study represents an advance that the electronic reconstruction and the multiple electron configurations of 3d transition metal ions will constitute a powerful tool for the designs of functional materials and creations of unconventional physical properties.	Nov 2020
I10-Beamline for Advanced Dichroism	Direct observation of ferrimagnetic ordering in inverse Heusler alloy Mn 2 CoAl Zhendong Chen , Wenqing Liu , Peng Chen , Xuezhong Ruan , Jiabao Sun , Ruobai Liu , Cunxu Gao , Jun Du , Bo Liu , Hao Meng , Rong Zhang , Yongbing Xu Applied Physics Letters 117 DOI: 10.1063/5.0013656 Diamond Proposal Number(s): [22532] Show Abstract ▼ Abstract: Compensated ferrimagnetic Heusler compounds with high spin polarization and a low net magnetic moment are strategically important materials for spin-logic and further energy-efficient spintronic applications. However, the element-resolved magnetic ordering of these compensated ferrimagnets remains an open issue. Here, we report a direct observation of the spin and orbital moments of the B2 phase Mn2CoAl thin film using the synchrotron-based x-ray magnetic circular dichroism technique. An ferrimagnetic ordering between Mn and Co elements and a compensated-ferrimagnet-like small net magnetic moment of only 0.34 μB/f.u. were observed unambiguously in B2 Mn2CoAl. Antiparallel coupling between Mn and Co is attributed to the mixture of the Mn(B) and Al occupation in the B2 phase Mn2CoAl lattice. This work demonstrates great potential of the compensated ferrimagnetic half-metallic inverse Heusler compounds Mn2CoAl for spintronic applications.	Jul 2020
I10-Beamline for Advanced Dichroism	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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