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Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains



Nanna Hagström, Rahul Jangid, F. N. U. Meera, Diego Turenne, Jeffrey Brock, Erik Lamb, Boyan Stoychev, Justine Schlappa, Natalia Gerasimova, Benjamin Van Kuiken, Rafael Gort, Laurent Mercadier, Loïc Le Guyader, Andrey Samartsev, Andreas Scherz, Giuseppe Mercurio, Hermann Dürr, Alexander Reid, Monika Arora, Hans Nembach, Justin Shaw, Emmanuelle Jal, Eric Fullerton, Mark Keller, Roopali Kukreja, Stefano Bonetti, Thomas J. Silva, Ezio Iacocca


Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, ultrafast optical pumping can be used to drastically change the energy landscape and quench the magnetic order parameter in magnetic systems. Here, we find a distinct symmetry-dependent ultrafast behaviour by use of ultrafast X-ray scattering from magnetic patterns with varying degrees of isotropic and anisotropic symmetry. After pumping with an optical laser, the scattered intensity reveals a radial shift exclusive to the isotropic component and exhibits a faster recovery time from quenching for the anisotropic component. These features arise even when both symmetry components are concurrently measured, suggesting a correspondence between the excitation and the magnetic order symmetry. Our results underline the importance of symmetry as a critical variable to manipulate the magnetic order in the ultrafast regime.
Physical Review B


ultrafast magnetization dynamics, X-ray resonant magnetic scattering, X-ray free electron laser, magnetic domains, nanoscale spin dynamics


Hagstrom, N. , Jangid, R. , Meera, F. , Turenne, D. , Brock, J. , Lamb, E. , Stoychev, B. , Schlappa, J. , Gerasimova, N. , Van Kuiken, B. , Gort, R. , Mercadier, L. , Le Guyader, L. , Samartsev, A. , Scherz, A. , Mercurio, G. , Durr, H. , Reid, A. , Arora, M. , Nembach, H. , Shaw, J. , Jal, E. , Fullerton, E. , Keller, M. , Kukreja, R. , Bonetti, S. , Silva, T. and Iacocca, E. (2022), Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains, Physical Review B, [online],, (Accessed May 30, 2024)


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Created December 23, 2022, Updated January 3, 2023