An electron spin resonance study of FeyNi80−yP14B6 alloys in the reentrant regime

We report susceptibility, hysteresis loop, ESR, and VSM measurements on a few alloys of the series FeyNi80−yG20 and compare them with our earlier studies on FexNi75−xG25 alloys, especially when x = y. In both cases we find a re-entrant regime for intermediate Fe concentrations. Replacement of G by Ni enhances Tc and stiffens the magnetic lattice. Spin freezing is accompanied by the onset of a distribution of internal fields which have a nonzero average for the G20 alloys when y?15.