Abstract
Abstract The methods for calculating the collective excitations and dynamical susceptibilities in various models of itinerant-electron magnetism are reviewed. The local-exchange model and the model-Hamiltonian approach are discussed, and their advantages and disadvantages as applied to ferromagnetic and antiferromagnetic systems are brought out. Results are presented for a new many-band calculation of a generalised susceptibility corresponding to the case of fcc antiferromagnetic manganese.
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