Hydrogenation

low temP6rature and magnetic field effects of amorphousFad--.CoxZrlo （x=0

4

10

20） alloys are studied with Mbssbauer spectroscOPy. Theexperimental results show that hydrogenation and low temperature make thehyperfme fields of the amorphous alloys increase

but they have dtherent influenceson magnetic anisotrOPy

i.e. hydrogenation makes the plane anisottopy PY increasewhile low temperature makes it decrease. The hroerfine field distributions of fouramorphous alloys are all bloodal

which means that the coealstence Of fe￣agnoticand antiferromagnetic states

hydrogenation and eXternal magnetic field all make thepercentage of antiferromagnetic slotes decrease. Hydrog6nation and temperatureeffectS become even stronger with decreasing Co content

which is also confirmed bythe difference of the spin--wave excitation and the average hyperhae field as afunction of hydrogenation take.The ed)erimental results are explained with a"3DFM+FS+FSC" magnetic stfuctnye model and a magnetic aaisotrOPy modelresulting from a diPOle-- diPOle interaction.