Time resolved Magnetooptical Kerr effect (TRMOKE) in insulating ferromagnetic phase in (Pr_0.6Ca_0.4)MnO₃ thin films on LaAlO₃ and SrTiO₃ substrates was measured upon photoexcitation in magnetic fields up to 1.1T. The photoinduced Kerr rotation and ellipticity show remarkably different magnetic-field dependence. From comparison with the static Kerr rotation and ellipticity we conclude that two different magnetic phases are present in the samples at low temperatures. According to small angle neutron scattering results in bulk one of the phases originates from nanoscopic ferromagnetic metallic clusters. Comparison of temporal dependence of the photoinduced Kerr signals with the photoinduced reflectivity indicates that upon photoexcitation changes of the volume fractions of these phases take place on a timescale of ten picoseconds.

[1] D. Saurel, A. Brûlet, A. Heinemann, C. Martin, S. Mercone, and C. Simon, Phys. Rev. B 73, 094438 (2006).

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