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Instruments / Technical Area	Publication Details	Published	Actions
I10-Beamline for Advanced Dichroism - scattering	Self-intercalation tunable interlayer exchange coupling in a synthetic van der Waals antiferromagnet Xiaoqian Zhang , Wenqing Liu , Wei Niu , Qiangsheng Lu , Wei Wang , Ali Sarikhani , Xiaohua Wu , Chunhui Zhu , Jiabao Sun , Mitchel Vaninger , Paul. F. Miceli , Jianqi Li , David J. Singh , Yew San Hor , Yue Zhao , Chang Liu , Liang He , Rong Zhang , Guang Bian , Dapeng Yu , Yongbing Xu Advanced Functional Materials 2009 DOI: 10.1002/adfm.202202977 Diamond Proposal Number(s): [22532] Show Abstract ▼ Abstract: One of the most promising avenues in 2D materials research is the synthesis of antiferromagnets employing 2D van der Waals (vdW) magnets. However, it has proven challenging, due in part to the complicated fabrication process and undesired adsorbates as well as the significantly deteriorated ferromagnetism at atomic layers. Here, the engineering of the antiferromagnetic (AFM) interlayer exchange coupling between atomically thin yet ferromagnetic CrTe2 layers in an ultra-high vacuum-free 2D magnetic crystal, Cr5Te8 is reported. By self-introducing interstitial Cr atoms in the vdW gaps, the emergent AFM ordering and the resultant giant magnetoresistance effect are induced. A large negative magnetoresistance (10%) with a plateau-like feature is revealed, which is consistent with the AFM interlayer coupling between the adjacent CrTe2 main layers in a temperature window of 30 K below the Néel temperature. Notably, the AFM state has a relatively weak interlayer exchange coupling, allowing a switching between the interlayer AFM and ferromagnetic states at moderate magnetic fields. This work represents a new route to engineering low-power devices that underpin the emerging spintronic technologies, and an ideal laboratory to study 2D magnetism.	May 2022
I06-Nanoscience (XPEEM) I10-Beamline for Advanced Dichroism - scattering	Element-specific spin and orbital moments and perpendicular magnetic anisotropy in Ta/CoFeB/MgO structures Yu Yan , Xianyang Lu , Bo Liu , Xiaoqian Zhang , Xiangyu Zheng , Hao Meng , Wenqing Liu , Junlin Wang , Iain G. Will , Jing Wu , Ping Kwan Johnny Wong , Jianwang Cai , Jun Du , Rong Zhang , Yongbing Xu Journal Of Applied Physics 127 DOI: 10.1063/1.5129489 Diamond Proposal Number(s): [16538] Show Abstract ▼ Abstract: Perpendicular magnetic anisotropy (PMA) in the Ta/CoFeB/MgO system has been studied using x-ray magnetic circular dichroism and vibrating sample magnetometry. The ratios of the orbital to spin magnetic moments of Co atoms in the Ta/CoFeB/MgO structures with PMA have been found to be enhanced by 100%, compared with the Ta/CoFeB/Ta structure without PMA. The orbital moments of Co are as large as 0.30 μ B 0.30μB , more than half of their spin moments in the perpendicularly magnetized Ta/CoFeB/MgO structures. The results indicate that the PMA observed in the CoFeB/MgO structures is related to the increased spin–orbital coupling of the Co atoms. This work offers experimental evidence of the correlation between PMA and the element-specific spin and orbital moments in the Ta/CoFeB/MgO systems.	Feb 2020

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