"Femtosecond Single-Shot Imaging of Nanoscale Ferromagnetic Order in Co/Pd Multilayers Using Resonant X-Ray Holography"

Tianhan Wang: Diling Zhu, Benny Wu, Catherine Graves, Stefan Schaffert, Torbjörn Rander, Leonard Müller, Boris Vodungbo, Cédric Baumier, David P. Bernstein, Björn Bräuer, Vincent Cros, Sanne de Jong, Renaud Delaunay, Andreas Fognini, Roopali Kukreja, Sooheyong Lee, Víctor López-Flores, Jyoti Mohanty, Bastian Pfau, Horia Popescu, Maurizio Sacchi, Anna B. Sardinha, Fausto Sirotti, Philippe Zeitoun, Marc Messerschmidt, Joshua J. Turner, William F. Schlotter, Olav Hellwig, Richard Mattana, Nicolas Jaouen, Franck Fortuna, Yves Acremann, Christian Gutt, Hermann A. Dürr, Eric Beaurepaire, Christine Boeglin, Stefan Eisebitt, Gerhard Grübel, Jan Lüning, Joachim Stöhr, and Andreas O. Scherz; Phys. Rev. Lett., 06/27/12.

Additional Authors: Diling Zhu, Benny Wu, Catherine Graves, Stefan Schaffert, Torbjörn Rander, Leonard Müller, Boris Vodungbo, Cédric Baumier, David P. Bernstein, Björn Bräuer, Vincent Cros, Sanne de Jong, Renaud Delaunay, Andreas Fognini, Roopali Kukreja, Sooheyong Lee, Víctor López-Flores, Jyoti Mohanty, Bastian Pfau, Horia Popescu, Maurizio Sacchi, Anna B. Sardinha, Fausto Sirotti, Philippe Zeitoun, Marc Messerschmidt, Joshua J. Turner, William F. Schlotter, Olav Hellwig, Richard Mattana, Nicolas Jaouen, Franck Fortuna, Yves Acremann, Christian Gutt, Hermann A. Dürr, Eric Beaurepaire, Christine Boeglin, Stefan Eisebitt, Gerhard Grübel, Jan Lüning, Joachim Stöhr, and Andreas O. Scherz

Abstract:

We present the first single-shot images of ferromagnetic, nanoscale spin order taken with femtosecond x-ray pulses. X-ray-induced electron and spin dynamics can be outrun with pulses shorter than 80 fs in the investigated fluence regime, and no permanent aftereffects in the samples are observed below a fluence of 25  mJ/cm2. Employing resonant spatially muliplexed x-ray holography results in a low imaging threshold of 5  mJ/cm2. Our results open new ways to combine ultrafast laser spectroscopy with sequential snapshot imaging on a single sample, generating a movie of excited state dynamics.