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 ${\mathrm{FePd}}_2{\mathrm{Te}}_2$. For bulk ${\mathrm{FePd}}_2{\mathrm{Te}}_2$, including longitudinal spin fluctuations yields a calculated $T_c$ of about 188 K, in good agreement with experiment. Upon reducing the dimensionality, ${\mathrm{FePd}}_2{\mathrm{Te}}_2$ 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 ($T_c=138$ and 186 K, respectively) to interchain antiferromagnetic (AFM) in the monolayer ($T_n=72\mathrm{K}$). Moreover, strain engineering provides an efficient route to tune the magnetism of monolayer and few-layer ${\mathrm{FePd}}_2{\mathrm{Te}}_2$ 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 ${\mathrm{FePd}}_2{\mathrm{Te}}_2$, which govern both the magnetic ground states and the magnetic transition temperatures.

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• Magnetic order
• 2-dimensional systems
• Layered crystals
• Density functional calculations