journal article·2023-09

Fe‐Intercalation Dominated Ferromagnetism of van der Waals Fe3GeTe2

Yueshen Wu, Yuxiong Hu, Cong Wang, Xiang Zhou, Xiaofei Hou, Wei Xia, Yiwen Zhang, Jinghui Wang, Yifan Ding, Jiadian He, Peng Dong, Song Bao, Jinsheng Wen, Yanfeng Guo, Kenji Watanabe, Takashi Taniguchi, Wei Ji, Zhu‐Jun Wang, Jun Li

Advanced Materials· Volume 35· Issue 36
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Abstract

Abstract Fe3GeTe2 have proven to be of greatly intrigue. However, the underlying mechanism behind the varying Curie temperature (Tc) values remains a puzzle. This study explores the atomic structure of Fe3GeTe2 crystals exhibiting Tc values of 160, 210, and 230 K. The elemental mapping reveals a Fe‐intercalation on the interstitial sites within the van der Waals gap of the high‐Tc (210 and 230 K) samples, which are observed to have an exchange bias effect by electrical transport measurements, while Fe intercalation or the bias effect is absent in the low‐Tc (160 K) samples. First‐principles calculations further suggest that the Fe‐intercalation layer may be responsible for the local antiferromagnetic coupling that gives rise to the exchange bias effect, and that the interlayer exchange paths greatly contribute to the enhancement of Tc. This discovery of the Fe‐intercalation layer elucidates the mechanism behind the hidden antiferromagnetic ordering that underlies the enhancement of Tc in Fe3GeTe2.
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Research context

OpenAlex topics: 2D Materials and Applications · Topological Materials and Phenomena · Graphene research and applications

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

Affiliations

School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China

Beijing Key Laboratory of Optoelectronic Functional Materials and Micro‐Nano Devices, Department of Physics Renmin University of China Beijing 100872 China

Key Laboratory of Quantum State Construction and Manipulation (Ministry of Education) Renmin University of China Beijing 100872 China

ShanghaiTech Laboratory for Topological Physics ShanghaiTech University Shanghai 200031 China

School of Physics & Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

Research Center for Functional Materials National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

International Center for Materials Nanoarchitectonics National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China

Wuhan National High Magnetic Field Center Huazhong University of Science & Technology Wuhan 430074 China

Funding

Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Fundamental Research Funds for the Central Universities · Natural Science Foundation of Shanghai Municipality · China Postdoctoral Science Foundation

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