Time resolved magnetooptical Kerr effect in (Pr,Ca)MnO3 thin films

Tomaž Mertelj 1Roman Yusupov 1Anton Gradišek 1Dragan Mihailovic 1Matteo Filippi 2Wilfrid Prellier 2

1. Jozef Stefan Institute, Jamova 39, Ljubljana, Slovenia
2. Laboratoir CRISMAT, CNRS UMR 6508, Bd Marechal Juin, Caen F-14050, France

Abstract

Time resolved Magnetooptical Kerr effect (TRMOKE) in insulating ferromagnetic phase in (Pr0.6Ca0.4)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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Presentation: Oral at E-MRS Fall Meeting 2009, Symposium E, by Tomaž Mertelj
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-08 11:02
Revised:   2009-06-07 00:48
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