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Nodal line semimetals in two-dimensional (2-D) materials have attractedintense attention currently. From fundamental physics and spintronicapplications points of view, high Curie temperature ferromagnetic (FM) oneswith nodal lines robust against spin-orbit coupling (SOC) are significantly indesirable. Here, we propose that FM K2N monolayer is such Weyl nodal linesemimetal. We show that K2N monolayer is dynamically stable, and has a FMground magnetic state with the out-of-plane [001] magnetization. It shows twonodal lines in the low-energy band structures. Both nodal lines are robustagainst SOC, under the protection of mirror symmetry. We construct an effectiveHamiltonian, which can well characterize the nodal lines in the system.Remarkably, the nodal line semimetal proposed here is distinct from thepreviously studied ones in that K2N monolayer is 2-D d0-type ferromagnet withthe magnetism arising from the partially filled N-p orbitals, which can bringspecial advantages in spintronic applications. Besides, the Curie temperaturein K2N monolayer is estimated to be 942K, being significantly higher thanprevious FM nodal lines materials. We also find that, specific tensile strainscan transform the nodal line from type-I to a type-II one, making its nodalline characteristics even more interesting.

Two-dimensional Weyl nodal line semimetal in high Curie temperature d0 ferromagnet K2N monolayer