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We determined the magnetic B-T phase diagram of PdFe bilayer on Ir(111)surface by performing Monte Carlo and spin dynamics simulations based on aneffective classical spin model. The parameters of the spin model weredetermined by ab initio methods. At low temperatures we found three types ofordered phases, while at higher temperatures, below the completely disorderedparamagnetic phase, a large region of the phase diagram is associated with afluctuation-disordered phase. Within the applied model, this state ischaracterized by the presence of skyrmions with finite lifetime. According tothe simulations, this lifetime follows the Arrhenius law as a function oftemperature.

Complex magnetic phase diagram and skyrmion lifetime in an ultrathin film from atomistic simulations