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Ultrafast terahertz magnetometry.

  • Zhang W Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615, Bielefeld, Germany.
  • Maldonado P Department of Physics and Astronomy, Uppsala University, Box 516, 75120, Uppsala, Sweden.
  • Jin Z Terahertz Technology Innovation Research Institute, University of Shanghai for Science and Technology, JunGong Road 516, 200093, Shanghai, China.
  • Seifert TS Department of Materials, ETH Zurich, Hönggerbergring 64, 8093, Zurich, Switzerland.
  • Arabski J Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (UMR 7504), 23 rue du Loess, BP 43, 67034, Strasbourg Cedex 2, France.
  • Schmerber G Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (UMR 7504), 23 rue du Loess, BP 43, 67034, Strasbourg Cedex 2, France.
  • Beaurepaire E Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (UMR 7504), 23 rue du Loess, BP 43, 67034, Strasbourg Cedex 2, France.
  • Bonn M Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany.
  • Kampfrath T Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany.
  • Oppeneer PM Department of Physics and Astronomy, Uppsala University, Box 516, 75120, Uppsala, Sweden.
  • Turchinovich D Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615, Bielefeld, Germany. dmtu@physik.uni-bielefeld.de.
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  • 2020-08-27
Published in:
  • Nature communications. - 2020
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy
General Chemistry
English A material's magnetic state and its dynamics are of great fundamental research interest and are also at the core of a wide plethora of modern technologies. However, reliable access to magnetization dynamics in materials and devices on the technologically relevant ultrafast timescale, and under realistic device-operation conditions, remains a challenge. Here, we demonstrate a method of ultrafast terahertz (THz) magnetometry, which gives direct access to the (sub-)picosecond magnetization dynamics even in encapsulated materials or devices in a contact-free fashion, in a fully calibrated manner, and under ambient conditions. As a showcase for this powerful method, we measure the ultrafast magnetization dynamics in a laser-excited encapsulated iron film. Our measurements reveal and disentangle distinct contributions originating from (i) incoherent hot-magnon-driven magnetization quenching and (ii) coherent acoustically-driven modulation of the exchange interaction in iron, paving the way to technologies utilizing ultrafast heat-free control of magnetism. High sensitivity and relative ease of experimental arrangement highlight the promise of ultrafast THz magnetometry for both fundamental studies and the technological applications of magnetism.
Language
  • English
Open access status
gold
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https://sonar.ch/global/documents/98835
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