TY - GEN
T1 - Emission of coherent THz magnons in an antiferromagnetic insulator triggered by ultrafast spin-phonon interactions
AU - Rongione, E.
AU - Gueckstock, O.
AU - Mattern, M.
AU - Gomonay, O.
AU - Meer, H.
AU - Schmitt, C.
AU - Ramos, R.
AU - Kikkawa, T.
AU - Micica, M.
AU - Saitoh, E.
AU - Sinova, J.
AU - Jaffres, H.
AU - Mangeney, J.
AU - Goennenwein, S. T.B.
AU - Geprags, S.
AU - Kampfrath, T.
AU - Klaui, M.
AU - Bargheer, M.
AU - Seifert, T. S.
AU - Dhillon, S.
AU - Lebrun, R.
N1 - Publisher Copyright:
© 2023 IEEE.
PY - 2023/1/1
Y1 - 2023/1/1
N2 - Antiferromagnetic (AFM) materials have been proposed for new types of narrowband THz spintronic devices owing to their ultrafast spin dynamics. Although manipulating coherently their spin dynamics remains a key challenge, this can be potentially 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 ultra-thin films of AFM - heavy metal (NiO/Pt). We show, experimentally and through modeling, two excitation processes of the 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 THz emission through the inverse spin Hall effect in the adjacent heavy metal layer, opening new routes towards the development of fast opto-spintronic devices based on AFM materials.
AB - Antiferromagnetic (AFM) materials have been proposed for new types of narrowband THz spintronic devices owing to their ultrafast spin dynamics. Although manipulating coherently their spin dynamics remains a key challenge, this can be potentially 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 ultra-thin films of AFM - heavy metal (NiO/Pt). We show, experimentally and through modeling, two excitation processes of the 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 THz emission through the inverse spin Hall effect in the adjacent heavy metal layer, opening new routes towards the development of fast opto-spintronic devices based on AFM materials.
U2 - 10.1109/IRMMW-THz57677.2023.10299196
DO - 10.1109/IRMMW-THz57677.2023.10299196
M3 - Conference contribution
AN - SCOPUS:85177666634
T3 - International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
BT - IRMMW-THz 2023 - 48th Conference on Infrared, Millimeter, and Terahertz Waves
PB - IEEE Computer Society
T2 - 48th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2023
Y2 - 17 September 2023 through 22 September 2023
ER -