Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains

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

arXiv · 2112.09587

Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains

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Abstract

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.

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Nanna Zhou Hagström, Rahul Jangid, Meera, Diego Turenne, Jeffrey Brock, Erik S. Lamb, Boyan Stoychev, Justine Schlappa, Natalia Gerasimova, Benjamin Van Kuiken, Rafael Gort, Laurent Mercadier, Loïc Le Guyader, Andrey Samartsev, Andreas Scherz, Giuseppe Mercurio, Hermann A. Dürr, Alexander H. Reid, Monika Arora, Hans T. Nembach, Justin M. Shaw, Emmanuelle Jal, Eric E. Fullerton, Mark W. Keller, Roopali Kukreja, Stefano Bonetti, Thomas J. Silva, Ezio Iacocca. 2021-12-17. Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains. https://arxiv.org/abs/2112.09587

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