Ultrafast Faraday effect and the dynamics of the antiferromagnet-paramagnet phase transition in FeBO3 |
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Authors: | A V Kimel’ R V Pisarev J Hohlfeld Th Rasing |
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Institution: | (1) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(2) Research Institute for Materials, University of Nijmegen, 6525 ED Nijmegen, Netherlands |
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Abstract: | The optical pump-probe technique using ultrashort laser pulses with a photon energy of 1.55 eV was used to study the dynamics of the antiferromagnet-paramagnet phase transition in FeBO3. The Faraday magneto-optical effect was measured with a time resolution of 100 fs, and signal transients were observed as functions of sample temperature. The rate of photoinduced phase transition was shown to be limited by the phonon-magnon relaxation rate with a characteristic time of 700 ps. The subpicosecond dynamics of Faraday rotation is not associated with the destruction of magnetic order but is caused by electron photoexcitation and recombination. |
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