Femtosecond Laser-Excitation-Driven High Frequency Standing Spin Waves in Nanoscale Dielectric Thin Films of Iron Garnets

Marwan Deb, Elena Popova, Michel Hehn, Niels Keller, Sébastien Petit-Watelot, Matias Bargheer, Stéphane Mangin, and Gregory Malinowski
Phys. Rev. Lett. 123, 027202 – Published 10 July 2019
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Abstract

We demonstrate that femtosecond laser pulses allow triggering high-frequency standing spin-wave modes in nanoscale thin films of a bismuth-substituted yttrium iron garnet. By varying the strength of the external magnetic field, we prove that two distinct branches of the dispersion relation are excited for all the modes. This is reflected in particular at a very weak magnetic field (33mT) by a spin dynamics with a frequency up to 15 GHz, which is 15 times higher than the one associated with the ferromagnetic resonance mode. We argue that this phenomenon is triggered by ultrafast changes of the magnetic anisotropy via laser excitation of incoherent and coherent phonons. These findings open exciting prospects for ultrafast photo magnonics.

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  • Received 16 April 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.027202

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Marwan Deb1,2,*, Elena Popova3, Michel Hehn1, Niels Keller3, Sébastien Petit-Watelot1, Matias Bargheer2, Stéphane Mangin1, and Gregory Malinowski1

  • 1Institut Jean Lamour (IJL), CNRS UMR 7198, Université de Lorraine, 54506 Vandœuvre-lès-Nancy, France
  • 2Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany
  • 3Groupe d’Etude de la Matière Condensée (GEMaC), CNRS UMR 8635, Université Paris-Saclay, 78035 Versailles, France

  • *Corresponding author. madeb@uni-potsdam.de

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Issue

Vol. 123, Iss. 2 — 12 July 2019

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