Application of Stoner Theory to Ferromagnetic ZrZn2-x Alloys

Abstract

We have studied the magnetic properties of a series of ferromagnetic alloys of ZrZn_2−x, where x varies from 0.05 to 0.2. We found that the Stoner theory of ferromagnetism was consistent with the data taken below T_c for all samples. Above T_c, however, the susceptibilities obeyed Curie‐Weiss laws, ${\text{χ∝[1−(T/T}}_c{\mathrm{)]}}^{\text{−1}}$ , and not ${\text{χ∝[1−(T}}^2{\mathrm{/T}}_c^2{\mathrm{)]}}^{\text{−1}}$ , as expected from the Stoner theory.