MOSSBAUER MEASUREMENTS OF SPIN CORRELATIONS IN A-(FE,NI)(90)ZR9SN

The local spin structure of the partially frustrated amorphous Fe90-xN ixZr9Sn system was investigated by Mossbauer spectroscopy for x=1,3. T he magnetic probe atom Fe-57 and the nonmagnetic Sn-119 were used to m onitor the local correlation of the spins. The additional Ni renders t he system less frustrated. We measured the temperature dependence of t he hyperfine fields of the two probe atoms. The ratio (B-hf(Sn-119))/( B-hf(Fe-57)) rises with increasing temperature. This is in contrast to the temperature independence found for this ratio in Fe92Zr7Sn. A sim ilar rise was found in the crystalline spin-glass AuFe where the slope was much larger and was related to a loss of longitudinal correlation s.