Abstract
Resonant magnetic X-ray scattering studies have been carried out recently to explore the phase transition and Néel temperature for the helical spin structure in single Ho films as a function of film thickness. However these experiments have a natural limit of about 200 Å, since with decreasing film thickness leaking charge scattering and finite thickness oscillations bury the magnetic satellite peaks. This limit hinders the investigation of scaling effects. Using neutron scattering we could now show that the intensity of the (00.2− τ) and (00.0+ τ) magnetic satellite reflections are surprisingly large, allowing to explore the phase transition in epitaxial Ho(00.1) films down to below 50 Å.
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