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Self-intercalation tunable interlayer exchange coupling in a synthetic van der Waals antiferromagnet

DOI: 10.1002/adfm.202202977 DOI Help

Authors: Xiaoqian Zhang (Nanjing University; Southern University of Science and Technology, Shenzhen) , Wenqing Liu (Nanjing University; Royal Holloway University of London) , Wei Niu (Nanjing University of Posts and Telecommunications) , Qiangsheng Lu (University of Missouri) , Wei Wang (Nanjing Tech University) , Ali Sarikhani (Missouri University of Science and Technology) , Xiaohua Wu (Southern University of Science and Technology) , Chunhui Zhu (Beijing National Laboratory of Condensed Matter Physics, Chinese Academy of Sciences) , Jiabao Sun (Royal Holloway University of London) , Mitchel Vaninger (University of Missouri) , Paul. F. Miceli (University of Missouri) , Jianqi Li (Beijing National Laboratory of Condensed Matter Physics, Chinese Academy of Sciences) , David J. Singh (University of Missouri) , Yew San Hor (Missouri University of Science and Technology) , Yue Zhao (Southern University of Science and Technology) , Chang Liu (Southern University of Science and Technology) , Liang He (Nanjing University) , Rong Zhang (Nanjing University) , Guang Bian (University of Missouri) , Dapeng Yu (Southern University of Science and Technology) , Yongbing Xu (Nanjing University; The University of York)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Functional Materials , VOL 2009

State: Published (Approved)
Published: May 2022
Diamond Proposal Number(s): 22532

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 NĂ©el 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.

Journal Keywords: GMR effect; interlayer exchange coupling; self-intercalation; synthetic antiferromagnets; van der Waals magnets

Diamond Keywords: Antiferromagnetism; Spintronics

Subject Areas: Materials, Physics

Instruments: I10-Beamline for Advanced Dichroism - scattering

Added On: 25/05/2022 11:20

Discipline Tags:

Quantum Materials Physics Electronics Magnetism Materials Science

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Absorption Spectroscopy (XAS) X-ray Magnetic Circular Dichroism (XMCD)