Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains Article - Décembre 2022

Nanna Zhou Hagström, Rahul Jangid, Meera Madhavi, 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 Silva, Ezio Iacocca

Nanna Zhou Hagström, Rahul Jangid, Meera Madhavi, 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 Silva, Ezio Iacocca, « Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains  », Physical Review B, décembre 2022, p. 224424. ISSN 2469-9950

Abstract

Femtosecond optical pumping of magnetic materials has been used to achieve ultrafast switching and recently to nucleate symmetry-broken magnetic states. However, when the magnetic order parameter already presents a broken-symmetry state, such as a domain pattern, the dynamics are poorly understood and consensus remains elusive. Here, we resolve the controversies in the literature by studying the ultrafast response of magnetic domain patterns with varying degrees of translation symmetry with ultrafast X-ray resonant scattering. A novel data analysis technique is introduced to disentangle the isotropic and anisotropic components of the x-ray scattering. We nd that the scattered intensity exhibits a radial shift restricted to the isotropic component, indicating that the far-from-equilibrium magnetization dynamics are intrinsically related to the spatial features of the domain pattern. Our results suggest novel pathways for the spatiotemporal manipulation of magnetism via far-from-equilibrium dynamics and by carefully tuning the ground state magnetic textures.

Voir la notice complète sur HAL

Actualités