R. Y. Engel⁴, M. Beye⁴, J. Lu³, D. J. Higley⁵, A. H. Reid⁵, W. Schlotter⁵, G. Coslovich⁵, M. Hoffmann⁵, G. Kolesov⁶, C. Schüßler-Langeheine⁷, A. Styervoyedov⁸, N. Tancogne-Dejean⁹, M. A. Sentef⁹, D. A. Reis³, A. Rubio^9,10, S. S. P. Parkin⁸, O. Karis¹, J.-E. Rubensson¹, O. Eriksson^1,11, and H. A. Dürr¹

• ¹Department of Physics and Astronomy, Uppsala University, Regementsvägen 1, 752 37 Uppsala, Sweden
• ²Center for Memory and Recording Research, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093-0401, USA
• ³Stanford PULSE Institute, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
• ⁴Department of Photon Science, DESY, Notkestraße 85, D-22607 Hamburg, Germany
• ⁵SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
• ⁶John Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
• ⁷Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, 12489 Berlin, Germany
• ⁸Max-Planck Institut für Mikrostrukturphysik, Weinberg 2, Halle, Germany
• ⁹Max Planck Institute for the Structure and Dynamics of Matter and Center for Free-Electron Laser Science, Luruper Chaussee 149, 22761 Hamburg, Germany
• ¹⁰Center for Computational Quantum Physics, Flatiron Institute, New York, New York 10010 USA
• ¹¹School of Science and Technology, Örebro University, SE-701 82 Örebro, Sweden

• ^*oscar.granas@physics.uu.se