Abstract
Inelastic neutron scattering measurements on a ferromagnetic Heusler alloy, Pd 2MnIn 1− x Sn x at the composition x = 0.75, have established the spin wave dispersion in the three principal symmetry directions. The results have been interpreted using a simple Heisenberg model in which the exchange constants are of long range, extending beyond 12 Å. The Curie temperature, spin wave stiffness constant and the thermal variation of the magnetisation, calculated using the derived exchange parameters are in close agreement with observation. Anomalies in the spin wave dispersion, which are also present to a lesser degree in Pd 2MnSn, have been interpreted as precursor effects associated with the onset of antiferromagnetic ordering, type AF3A, which is the magnetic structure observed in the range 0.2 ⩽ x ⩽ 0.6.
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