We report comparative studies of photoinduced spin and charge dynamics in the three kinds of the charge/orbital ordered (CO/OO) manganites. By the irradiation of a femtosecond laser pulse, ultrafast ferromagnetism is induced in Gd 0:55Sr 0:45MnO 3 by the photocarrier-induced double exchange interaction, while delayed ferromagnetism occurs in Nd 0:5Sr 0:5MnO 3 through the thermalizations of the spin and lattice sectors with the charge sector. In Pr 0:55(Ca 0:8Sr 0:2) 0:45MnO 3, neither of the ultrafast nor delayed ferromagnetism was observed. Such differences between photoinduced magnetisms will be discussed in terms of the lattice-structural change between the CO/OO and ferromagnetic states.
- Perovskite manganite
- Time-resolved magneto-optical Kerr effect
- Ultrafast spin dynamics