A new X-ray-based technique, X-ray photon correlation spectroscopy, is developed to directly measure magnetic noise. Its use is demonstrated for elemental chromium, an antiferromagnet that displays a nanometre-scale superstructure of spin- and charge-density. Fingerprints of a particular magnetic domain configuration are obtained, and after the temporal evolution of the patterns, magnetic domain walls advancing and retreating over micron distances are observed.
- O. G. Shpyrko
- E. D. Isaacs
- A. R. Sandy