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Laser‐induced magnetisation dynamics in La 0.7 Sr 0.3 MnO 3 /SrRuO 3 superlattices
Author(s) -
Razdolski Ilya,
Subkhangulov Ruslan R.,
Gheorghe Diana G.,
Bern Francis,
Vrejoiu Ionela,
Kimel Alexey V.,
Kirilyuk Andrei,
Ziese Michael,
Rasing Theo
Publication year - 2015
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201510272
Subject(s) - superlattice , magnetization , condensed matter physics , curie temperature , magnetization dynamics , materials science , excitation , physics , ferromagnetism , magnetic field , quantum mechanics
Laser‐induced magnetisation dynamics of a La 0.7 Sr 0.3 MnO 3 /SrRuO 3 superlattice is studied by means of a single‐colour optical pump‐probe technique. Significant differences in the magnetisation dynamics of a superlattice with respect to the single layers of constituent materials are demonstrated. Below the Curie temperature T C of SrRuO 3 , laser‐induced ultrafast demagnetisation is found to be followed by a uniform precession of the magnetisation around its new equilibrium. The data is described within a simple model based on a displacive excitation of a precessional magnetisation dynamics. The model is shown to give a good fit to the experimental data. As the initial temperature approaches T C , the oscillations get suppressed and eventually vanish. The magnetisation dynamics is shown to depend on whether the two distinct magnetisation vectors in the superlattice are ferromagnetically or antiferromagnetically aligned. (© 2015 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)