| AVS 64th International Symposium & Exhibition | |
| Novel Trends in Synchrotron and FEL-Based Analysis Focus Topic | Thursday Sessions |
| Session SA+AC+MI-ThM |
| Session: | Frontiers in Probing Properties and Dynamics of Nanostructures and Correlation Spectroscopy |
| Presenter: | Christian Gutt, University of Siegen, Germany |
| Authors: | C. Gutt, University of Siegen, Germany T. Sant, University of Siegen, Germany D. Ksenzov, University of Siegen, Germany U. Pietsch, University of Siegen, Germany J. Luening, Sorbonne University F. Capotondi, Elettra-Sincrotrone Trieste, Italy E Pedersoli, Elettra-Sincrotrone Trieste, Italy M. Manfredda, Elettra-Sincrotrone Trieste, Italy M. Kiskinova, Elettra-Sincrotrone Trieste, Italy M. Klaeui, University of Mainz H. Zabel, University of Mainz |
| Correspondent: | Click to Email |
Exciting a ferromagnetic material with an ultrashort IR laser pulse is known to induce a reduction of magnetic order and ultrafast spin diffusion processes . Both processes produce disorder on 100s fs scales and their role in a deterministic creation and switching of magnetic order is still poorly understood. Here, we demonstrate that a nanoscale magnetization-reversal exists in the vicinity of domain walls in the near-surface region of a ferromagnetic Co/Pd thin film upon IR excitation. This magnetization-reversal is driven by the different transport properties of majority and minority carriers through a magnetically disordered domain network. We followed the ultrafast temporal evolution by means of an ultrafast resonant magnetic scattering experiment in surface scattering geometry, which enables to exploit the domain network within the top 3 nm to 5 nm layers of the FM film. We observed magnetization-reversal close to the domain wall boundaries that becomes more pronounced moving closer to the film surface. Its lateral extension has allowed us to measure the ultrafast spin-diffusion coefficients and ultrafast spin velocities for majority and minority carriers upon IR excitation.