Ultrafast photoinduced phase separation dynamics in Pr0.6Ca0.4MnO3 thin filmsT. Mertelj1, 2, R. Yusupov1, A. Gradišek1, M. Filippi3, W. Prellier3 and D. Mihailovic1, 2
1 Jozef Stefan Institute - Jamova 39, 1000 Ljubljana, Slovenia, EU
2 Faculty of Mathematics and Physics, University of Ljubljana - 1000 Ljubljana, Slovenia, EU
3 Laboratoire CRISMAT, CNRS UMR 6508 - Bd du Marechal Juin, F-14050 Caen Cedex, France, EU
received 17 October 2008; accepted in final form 22 May 2009; published June 2009
published online 22 June 2009
The time-resolved magnetooptical Kerr effect in the substrate-strain-induced insulating ferromagnetic phase in (Pr0.6Ca0.4)MnO3 thin films on two different substrates was measured in a magnetic field up to 1.1 T. The photoinduced Kerr rotation and ellipticity show remarkably different magnetic-field dependence. From the comparison of the magnetic-field dependences of the photoinduced and static Kerr rotation and ellipticity we conclude that a transient ferromagnetic metallic phase, embedded within the insulating ferromagnetic phase, is created upon the photoexcitation at low temperatures. A comparison of temporal dependence of the photoinduced Kerr signals with the photoinduced reflectivity indicates that the change of the fractions of the phases takes place on a timescale of ten picoseconds independent of the substrate.
78.47.jc - Time resolved spectroscopy (1 > ps).
78.20.Ls - Magnetooptical effects.
75.70.Ak - Magnetic properties of monolayers and thin films.
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