Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.077402
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Funding
- Stichting voor Fundamenteel Onderzoek der Materie (FOM), which is part of the Netherlands Organisation for Scientific Research (NWO)
- Deutsche Forschungsgemeinschaft (DFG) [SFB 608]
- BMBF [05ES3XBA/5, 05KS7PC1, 05KS7PK1]
- EU [BESSY-ID.06.2.198, RII 3CT-2004-506008]
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We report the direct observation of slow fluctuations of helical antiferromagnetic domains in an ultrathin holmium film using coherent resonant magnetic x-ray scattering. We observe a gradual increase of the fluctuations in the speckle pattern with increasing temperature, while at the same time a static contribution to the speckle pattern remains. This finding indicates that domain-wall fluctuations occur over a large range of time scales. We ascribe this nonergodic behavior to the strong dependence of the fluctuation rate on the local thickness of the film.
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