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The magnetic properties of monolayer FeSe films are investigated viafirst-principles spin-spiral calculations. Although the (pi,pi) collinearantiferromagnetic (CL-AFM) mode is lowest in energy, the spin-wave energy E(q)- which exhibits intrinsic non-Heisenberg behavior - is found to be extremelyvery flat over a large region of the two-dimensional Brillouin zone centered atthe checkerboard antiferromagnetic (CB-AFM) q=0 configuration, giving rise to asharp peak in the spin density of states. Considering the paramagnetic state asan incoherent average over spin-spiral states, we find that resultingelectronic band states around the Fermi level closely resemble the bands of theCB-AFM configuration - not the CL-AFM one - and thus providing a naturalexplanation of the angle-resolved photoemission observations. The presence ofthe SrTiO3(001) substrate, both with and without interfacial oxygen vacancies,is found to reduce the energy difference between the CB-AFM and CL-AFM statesand hence enhancing the CB-AFM-like fluctuations.

Magnetic fluctuations and spin-spirals in single-layer FeSe