Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin–phonon interactions

被引：0
作者：
E. Rongione
O. Gueckstock
M. Mattern
O. Gomonay
H. Meer
C. Schmitt
R. Ramos
T. Kikkawa
M. Mičica
E. Saitoh
J. Sinova
H. Jaffrès
J. Mangeney
S. T. B. Goennenwein
S. Geprägs
T. Kampfrath
M. Kläui
M. Bargheer
T. S. Seifert
S. Dhillon
R. Lebrun
机构：
[1] Unité Mixte de Physique,WPI
[2] CNRS,Advanced Institute for Materials Research
[3] Thales,Department of Applied Physics
[4] Université Paris-Saclay,Institute for AI and Beyond
[5] Laboratoire de Physique de l’Ecole Normale Supérieure,Department of Physics
[6] ENS,Center for Quantum Spintronics, Department of Physics
[7] Université PSL,undefined
[8] CNRS,undefined
[9] Sorbonne Université,undefined
[10] Université Paris Cité,undefined
[11] Institute of Physics,undefined
[12] Freie Universität Berlin,undefined
[13] Institut für Physik und Astronomie,undefined
[14] Universität Potsdam,undefined
[15] Institute of Physics,undefined
[16] Johannes Gutenberg-University Mainz,undefined
[17] Tohoku University,undefined
[18] Centro Singular de Investigación en Química Bilóxica e Materiais Moleculares (CIQUS),undefined
[19] Departamento de Química-Física,undefined
[20] Universidade de Santiago de Compostela,undefined
[21] The University of Tokyo,undefined
[22] The University of Tokyo,undefined
[23] University of Konstanz,undefined
[24] Walther-Meißner-Institut,undefined
[25] Bayerische Akademie der Wissenschaften,undefined
[26] Graduate School of Excellence Materials Science in Mainz (MAINZ),undefined
[27] Norwegian University of Science and Technology,undefined
[28] Helmholtz-Zentrum Berlin für Materialien und Energie,undefined
[29] Wilhelm-Conrad-Röntgen Campus,undefined
[30] BESSY II,undefined
来源：
Nature Communications | / 14卷
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摘要：
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 excitations. 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.
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