Spin-wave excitation and Mossbauer spectroscopy of amorphous alloys

Amorphous Fe-Co-Zr and (Fe-TM) SiB (TM = Co, Si, Mo, Nb) alloys have been s tudied by Mossbauer spectroscopy and magnetization measurements from 1.5 to 300 K. The results show that the magnetic properties of different types of amorphous alloys are different, which may be related to the inhomogeneous magnetic interactions in some alloys. From three different theories (spin w ave stiffness relation, Handrich relation and hyperfine field distribution curve), we obtain the structure fluctuations delta, delta' and delta". Comp aring with delta, delta' and delta", we can find that the value of delta co incides with one of delta', and the similar trend exists for all of structu re fluctuations, which means that the spin wave excitations of amorphous al loys are closely correlated to the structure fluctuation and the hyperfine field distributions. (C) 2000 Elsevier Science Ltd. All rights reserved.