Photoinduced spin-disorder in a ferromagnetic maganite film

Photoinduced effects in a La 0.6 Sr 0.4 MnO 3 film ( T c ∼315 K) have been investigated in the temperature range 290–470 K by means of a pump-probe method. Below T c , we have observed transient transmission changes Δ T / T induced by pump pulse excitations at 2.54 and 1.55 eV, which have been interpreted in terms of the photoinduced spin-disorder in the ferromagnetic phase. We further have compared the photoinduced Δ T / T with the photoinduced resistivity change Δ R / R .