Abstract
The magnetic behaviour of amorphous RE 0.67Zr 0.33 (RE = Tb, Gd) alloys has been studied by magnetization measurements in applied field up to 4.7 T, in the temperature range from 300 to 1.7 K. Both alloys show a positive paramagnetic Curie temperature (⊝ p) and the presence of a susceptibility cusp at the characteristic temperature T f. The evolution of the magnetic behaviour of RE 0.67Zr 0.33 alloys from paramagnetic state, at high temperature, to correlated clusters, below T f, through an intermediate region - superparamagnetic state in the case of a Gd 0.67Zr 0.33 alloy - has been studied. We assign the absence of magnetic saturation at 1.7 K in a field of 4.7 T for both alloys, to variations of exchange interaction sign for Gd alloy and dominant local anisotropy for Tb alloy, respectively. We show that these alloys obey the scaling law over a large temperature range and we determine the Curie temperature of clusters in agreement with the order already observed by neutron scattering.
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