Autoren:	Rongione, Enzo Gueckstock, Oliver Mattern, M. Gomonay, Olena Meer, Hendrik Schmitt, Christian Ramos, Rafael Kikkawa, Takashi Mičica, M. Saitoh, E. Sinova, Jairo Jaffrès, Henri Mangeney, J. Goennenwein, Sebastian T. B. Geprägs, Stephan Kampfrath, Tobias Kläui, Mathias Bargheer, M. Seifert, Tom S. Dhillon, Sukhdeep Lebrun, Romain
Titel:	Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions
Online-Publikationsdatum:	19-Jun-2023
Erscheinungsdatum:	2023
Sprache des Dokuments:	Englisch
Zusammenfassung/Abstract:	Antiferromagnetic materials have been proposed as new types of narrowband THz spintronic devices owing to their ultrafast spin dynamics. Manipulating coherently their spin dynamics, however, remains a key challenge that is envisioned to be accomplished by spin-orbit torques or direct optical excita tions. Here, we demonstrate the combined generation of broadband THz (incoherent) magnons and narrowband (coherent) magnons at 1 THz in low damping thin films of NiO/Pt. We evidence, experimentally and through modeling, two excitation processes of spin dynamics in NiO: an off-resonant instantaneous optical spin torque in (111) oriented films and a strain-wave induced THz torque induced by ultrafast Pt excitation in (001) oriented films. Both phenomena lead to the emission of a THz signal through the inverse spin Hall effect in the adjacent heavy metal layer. We unravel the characteristic timescales of the two excitation processes found to be < 50 fs and > 300 fs, respectively, and thus open new routes towards the development of fast opto spintronic devices based on antiferromagnetic materials.
DDC-Sachgruppe:	530 Physik 530 Physics
Veröffentlichende Institution:	Johannes Gutenberg-Universität Mainz
Organisationseinheit:	FB 08 Physik, Mathematik u. Informatik
Veröffentlichungsort:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-9192
Version:	Published version
Publikationstyp:	Zeitschriftenaufsatz
Nutzungsrechte:	CC BY
Informationen zu den Nutzungsrechten:	https://creativecommons.org/licenses/by/4.0/
Zeitschrift:	Nature Communications 14
Seitenzahl oder Artikelnummer:	1818
Verlag:	Nature Publishing Group UK
Verlagsort:	London
Erscheinungsdatum:	2023
ISSN:	2041-1723
DOI der Originalveröffentlichung:	10.1038/s41467-023-37509-6
Enthalten in den Sammlungen:	JGU-Publikationen