Ultrafast terahertz magnetometry

Wentao Zhang, Pablo Maldonado, Zuanming Jin, Tom S. Seifert, Jacek Arabski, Guy Schmerber, Eric Beaurepaire, Mischa Bonn, Tobias Kampfrath, Peter M. Oppeneer and Dmitry Turchinovich ()
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Wentao Zhang: Universität Bielefeld
Pablo Maldonado: Uppsala University
Zuanming Jin: University of Shanghai for Science and Technology
Tom S. Seifert: ETH Zurich
Jacek Arabski: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (UMR 7504)
Guy Schmerber: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (UMR 7504)
Eric Beaurepaire: Université de Strasbourg, CNRS, Institut de Physique et Chimie des Matériaux de Strasbourg (UMR 7504)
Mischa Bonn: Max Planck Institute for Polymer Research
Tobias Kampfrath: Freie Universität Berlin
Peter M. Oppeneer: Uppsala University
Dmitry Turchinovich: Universität Bielefeld

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract 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.

Date: 2020
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DOI: 10.1038/s41467-020-17935-6

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