Abstract
It is shown that the difference in the results of the macroscopic anisotropy field measurements in YCo 3 and Y 2Co 17 and these obtained by FMR technique can be explained by the local Co anisotropy. In spite of the ferromagnetic ordering of the magnetic moments in these compounds the magnetic resonance in the microwave region cannot be treated as the classical ferromagnetic one. The simplified resonant condition is effected by the anisotropy in other ways than that for an ordinary ferromagnetic material with one magnetic sublattice.
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