Abstract
The magnetic properties of a disordered binary magnetic Heisenberg alloy (A p B 1− p ) with both ferromagnetic and antiferromagnetic exchange interactions are studied theoretically using the cluster variation method. The approximate free energy is evaluated by treating the interactions within the clusters of all possible configurations exactly and replacing the rest of the interaction by variational effective field. Depending on p and the exchange parameters, the Heisenberg alloy exhibits ferromagnetic phase with incomplete magnetic saturation and the re-entrant magnetic behaviour. These results are compared with the corresponding results of an Ising system.
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