Mössbauer studies of the re-entrant spin-glass behaviour of Fe–Al alloys |
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Authors: | D. Martín Rodríguez F. Plazaola J. S. Garitaonandia |
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Affiliation: | (1) Elektrika eta Elektronika Saila, Universidad del País Vasco-Euskal Herriko Unibertsitatea, 644 P. K., 48080 Bilbao, Spain;(2) Fisika Aplikatua II Saila, Universidad del País Vasco-Euskal Herriko Unibertsitatea, 48080 Bilbao, Spain |
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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 Mössbauer spectroscopy, combined with other experimental techniques, is useful to describe and explain this behaviour. Results show that the Mössbauer 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 spin-glass 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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Keywords: | M?ssbauer spectroscopy spin-glass behaviour magnetic cluster system |
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