Magnetism of σ-phase Fe–Mo alloys: ac magnetic susceptibility study

Evidence for a re-entrant character of magnetism of σ-phase Fe–Mo alloys: Non-linear susceptibilities

“…These features are in line with our previous observations [12] according to which the strength of magnetism in the investigated samples significantly weakens when the Mo content increases. In any case, the data presented in Fig.…”

“…The frequency dependence of the spin-freezing temperature, Tf, was reported and discussed in detail in our previous paper [12]. Values of characteristic quantities were found to be close to those typical of the canonical SGs.…”

“…in all four cases the ground state is constituted by a spin glass (SG) which in the case of the Fe-Cr and Fe-V systems has a re-entrant character [11]. Some magnetic features revealed for  in the Fe-Re [9] and Fe-Mo systems [11,12] indicate that it also may be the case here. It is known that non-linear AC susceptibilities, 2, 3,…, can give a valuable information on the character of magnetism.…”

“…Systematic ac magnetic susceptibility measurements carried out on a series of -Fe100-xMox (x=45, 47, 51, 53) samples gave a clear evidence that the ground magnetic state of the -FeMo alloys was constituted by SG [12]. Its features, despite a high concentration of the magnetic carriers, were found to be close to those typical of the canonical SGs.…”

“…The latter feature suggests a magnetic order exists above the spin-freezing temperature, hence the magnetism of the system has a re-entrant character. To shed more light on the issue, non-linear susceptibilities were measured on the same samples as reported elsewhere [12], and the results obtained are presented and discussed in this paper.…”