journal article·2022-08Open access

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· Volume 32· Issue 32

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.
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Research context

OpenAlex topics: 2D Materials and Applications · Topological Materials and Phenomena · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials School of Electronic Science and Engineering Nanjing University Nanjing 210093 China

Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China

Department of Electronic Engineering Royal Holloway University of London Egham Surrey TW20 0EX UK

New Energy Technology Engineering Laboratory of Jiangsu Provence & School of Science Nanjing University of Posts and Telecommunications Nanjing 210023 China

Department of Physics and Astronomy University of Missouri Columbia MO 65211 USA

Key Laboratory of Flexible Electronics & Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 China

Department of Physics Missouri University of Science and Technology Missouri 65409 USA

Department of Physics Southern University of Science and Technology Shenzhen 518055 China

Beijing National Laboratory of Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

York‐Nanjing Joint Centre (YNJC) for Spintronics and Nano Engineering Department of Electronic Engineering The University of York York YO10 3DD UK

Funding

National Basic Research Program of China · National Natural Science Foundation of China · Leverhulme Trust · Royal Society · China Postdoctoral Science Foundation · U.S. Department of Energy · Basic Energy Sciences · Natural Science Foundation of Jiangsu Province · Diamond Light Source

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