Abstract
Neutron polarisation analysis scattering studies have been undertaken on a number of metallic antiferromagnetic alloys based on γ-Mn. Results obtained for the Mn-Cu alloy system will be reviewed. The common feature in this study and other γ-Mn alloys is a component transverse to the antiferromagnetic direction in the defect centred on the alloying element. The local canting of the moment appears to be due to the occurrence of unsatisfied antiferromagnetic interactions in the face centred cubic type-1 antiferromagnetic structure. A classical spin model of the defect structure will be presented. This local structure is derived by minimising the energy of the local spin configuration in the presence of a rigid long range antiferromagnetic order. The local configuration is then allowed to perturb the long range antiferromagnetic order through the wavevector dependent susceptibility estimated from the measured magnon dispersions in this material.
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