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Abstract:
Heisenberg exchange parameters for various Heusler compounds with L2(1)
structure were calculated using the Korringa-Kohn-Rostoker method and by
employing the magnetic-force theorem to calculate the total energy
changes associated with a local rotation of magnetization directions.
Random occupation was treated within the coherent potential
approximation. Further, the Curie temperatures were calculated in the
mean-field approximation and have been found to be in good agreement
with the experiment. A procedure for evaluating the spin-stiffness
constants for the case of multiple magnetic sublattices is given and the
results were compared with measured values. Magnon dispersion curves
were obtained by Fourier transforming the calculated exchange
parameters.