Abstract
The low-field susceptibility of holmium metal is calculated from the formula of Nagamiya et al. (1962) using the values of the exchange derived from inelastic neutron scattering. The temperature variation of the calculated susceptibility is in good agreement with the experimental data. The measured values are larger than the calculated values and this is tentatively ascribed to the presence of 'ferromagnetic' domain walls separating spirals of opposite sense. The field-induced transitions from the helical or conical to the ferromagnetic phase seem to be driven solely by the combined effects of the basal plane anisotropy and the b and c magnetostrictive energies. In contrast to the case of Dy it seems that in Ho there is no change of the exchange parameters at the field-induced transitions. The estimated effect of the anisotropic exchange K22(q), using the known values for Er, seems to be relatively unimportant within the temperature range covered by the helical phase.
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