Owing to strong competition between electron itineracy and localization, and existence of the multiple degrees of freedom, a wide variety of drastic changes in electron and lattice structures are brought about by photoirradiation in correlated electron magnets. Recent rapid progresses of the ultrafast light source, time-resolved probe techniques as well as the theoretical calculation methods for the real time dynamics promote the studies of photoinduced nonequilibrium dynamics in correlated magnets. In this talk, we introduce the photoinduced spin dynamics in the prototypical ferromagnetic system, i.e. the double exchange (DE) system. We found that the DE interaction is changed into “an antiferromagnetic interaction” in highly non-equilibrium state, in contrast to the photocarrier injection effect. Its microscopic mechanism as well as emergence of transient topological spin textures are also introduced.
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