Excitation and detection of coherent nanoscale spin waves via extreme ultraviolet transient gratings

Author:

Miedaner Peter R.1ORCID,Berndt Nadia1ORCID,Deschamps Jude1ORCID,Urazhdin Sergei2ORCID,Khatu Nupur345ORCID,Fainozzi Danny3ORCID,Brioschi Marta67ORCID,Carrara Pietro67ORCID,Cucini Riccardo7ORCID,Rossi Giorgio67ORCID,Wittrock Stefen89ORCID,Ksenzov Dmitriy10ORCID,Mincigrucci Riccardo3,Bencivenga Filippo3ORCID,Foglia Laura3ORCID,Paltanin Ettore311ORCID,Bonetti Stefano412ORCID,Engel Dieter9ORCID,Schick Daniel9ORCID,Gutt Christian10,Comin Riccardo13ORCID,Nelson Keith A.1ORCID,Maznev Alexei A.1ORCID

Affiliation:

1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, USA.

2. Department of Physics, Emory University, Atlanta, GA, USA.

3. Elettra Sincrotrone Trieste, Basovizza, Italy.

4. Department of Molecular Sciences and Nanosystems, Ca’Foscari University of Venice, Venice, Italy.

5. European XFEL, Holzkoppel 4, 22869 Schenefeld, Germany.

6. Dipartimento di Fisica, Università degli Studi di Milano, Milano, Italy.

7. CNR-Istituto Officina dei Materiali, Trieste, Italy.

8. Helmholtz-Zentrum Berlin Für Materialien und Energie GmbH, Hahn-Metiner-Platz 1, 14109 Berlin, Germany.

9. Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy, Max-Born-Str. 2A, 12489 Berlin, Germany.

10. Department Physik, Universität Siegen, Siegen, Germany.

11. Department of Physics, Università degli Studi di Trieste, 34127 Trieste, Italy.

12. Department of Physics, Stockholm University, Stockholm, Sweden.

13. Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA.

Abstract

The advent of free electron lasers has opened the opportunity to explore interactions between extreme ultraviolet (EUV) photons and collective excitations in solids. While EUV transient grating spectroscopy, a noncollinear four-wave mixing technique, has already been applied to probe coherent phonons, the potential of EUV radiation for studying nanoscale spin waves has not been harnessed. Here we report EUV transient grating experiments with coherent magnons in Fe/Gd ferrimagnetic multilayers. Magnons with tens of nanometers wavelengths are excited by a pair of femtosecond EUV pulses and detected via diffraction of a probe pulse tuned to an absorption edge of Gd. The results unlock the potential of nonlinear EUV spectroscopy for studying magnons and provide a tool for exploring spin waves in a wave vector range not accessible by established inelastic scattering techniques.

Publisher

American Association for the Advancement of Science (AAAS)

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