Laser‐induced magnetisation dynamics in La0.7Sr0.3MnO3/SrRuO3 superlattices |
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| Authors: | Ilya Razdolski Ruslan R Subkhangulov Diana G Gheorghe Francis Bern Ionela Vrejoiu Alexey V Kimel Andrei Kirilyuk Michael Ziese Theo Rasing |
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| Institution: | 1. Radboud University Nijmegen, Institute for Molecules and Materials, AJ, The Netherlands;2. Present address: Fritz‐Haber‐Institut der MPG, Berlin, Germany;3. Division of Superconductivity and Magnetism, University of Leipzig, Leipzig, Germany;4. Max Planck Institute for Solid State Research, Stuttgart, Germany |
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| Abstract: | Laser‐induced magnetisation dynamics of a La0.7Sr0.3MnO3/SrRuO3 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 TC of SrRuO3, 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 TC, 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) |
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| Keywords: | magnetisation dynamics time‐resolved Kerr rotation complex oxides superlattice multilayer |
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