¹Institut de Physique et de Chimie des Matériaux de Strasbourg, UMR7504, CNRS et Université de Strasbourg, 67034 Strasbourg, France
² Institut für Optik und Atomare Physik, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany
³ Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette Cedex, France
⁴Department of Materials Science and Engineering, Stanford University, Stanford, California 94035, USA
⁵ Stanford Institute for Materials & Energy Science (SIMES), SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California, 94025, USA
⁶ Department of Applied Physics, Stanford University, Stanford, California 94035, USA
⁷ CSNSM CNRS- IN2P3 Paris-Sud Orsay France
⁸Unité mixte CNRS/ Thales Univ. Paris Sud, 91767 Palaiseau France
⁹ Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
¹⁰Laboratoire de Chimie Physique - Matière et Rayonnement, Université Pierre et Marie Curie - CNRS UMR 7614, 75005 Paris, France

The active field of ultrafast magnetization dynamics develops nowadays from averaging spectroscopy techniques to space resolved microscopy. Recently progresses were performed using sliced X-ray sources to observe how ultrashort laser light pulses modify the spin and orbital angular momentum [1,2]. Recently, XFELs provide the necessary fluence for time resolved scattering experiments. In the experiment described here we study the dynamic of magnetic stripe domains after excitation by single and ultrashort IR laser pulses. We use ferromagnetic CoPd thin films showing out-of-plane anisotropy and aligned magnetic domains. We record single-shot X-ray magnetic resonant scattering patterns (XMRS) at the SXR beamline of the Linear Coherent Light Source, using the magnetic circular dichroism at the CoL3 absorption edge. Ultrafast changes induced on CoPd magnetic domain configurations by an intense and individual IR laser pulse were studied. At the CoL3 edge energy we follow the time dependent transformation of the initial magnetic stripe domains to different magnetic domains by using a single shot pump-probe set up. The experimental results show how fast the ordered stripe domain structure is lost and how a new magnetic order re-appears. By modelling the magnetic domains as a function of the temperature dependent anisotropy constants for a CoPd alloy film, we reproduce the time dependent transformation of the nanometer sized domain configurations under a static Oersted field explaining the new stripe order which appears a few nanoseconds after the laser excitation.