Tunable itinerant ferromagnetism in two-dimensional FePd2Te2 hosting 1D spin chains

One-dimensional (1D) magnetism offers unidirectional spin interactions that allow unique tunable properties and unconventional spin phenomena. However, it often suffers from poor stability, limiting practical applications. In this regard, integrating 1D magnetism into two-dimensional (2D) materials enables a promising route to stabilize these systems while preserving their anisotropic magnetic characteristics. Here, we focus on the 2D ferromagnet FePd 2 Te 2 (T C = 183 K), which hosts 1D spin chains and strong in-plane anisotropy. Our first-principles calculations reveal highly anisotropic magnetic exchange interactions, confirming its 1D ferromagnetic nature. We modulate this behavior by Co and Ni substitution and introduce two new members of this family: CoPd 2 Te 2 (a ferromagnet) and NiPd 2 Te 2 . Our results unveil the microscopic mechanisms governing the behavior of FePd 2 Te 2 and CoPd 2 Te 2 . Furthermore, we also demonstrate that the variation of the chain length is key to modulating magnetism. Finally, we determine the magnon dispersion, showcasing a pronounced anisotropy that enables unidirectional magnon propagation.