Abstract
Fe-Al alloys around the concentration of 30 at. % Al present re-entrant spin-glass behaviour at low temperatures. This behaviour is not completely understood and Mossbauer spectroscopy, combined with other experimental techniques, is useful to describe and explain this behaviour. Results show that the Mossbauer spectra coincide with the magnetic behaviour showed in literature and they can be explained as a magnetic cluster system whose magnetic clusters are getting smaller when the temperature is decreasing. When the temperature is reaching to the spinglass transition at 92 K the spins in the paramagnetic matrix are moving slower and below this transition the spins are completely frozen.
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