Magnetic phase diagram in FexSn1-xamorphous alloys

Amorphous Fe
x
Sn
1-x
alloys have been prepared by a vapour deposition technique and their magnetic properties have been investigated. Competition of ferro- and antiferromagnetic interaction results in quite a complex behaviour : x > 0.45 corresponds to alloys with a typical ferromagnetic order and a transition to a paramagnetic state at a Curie temperature T
c
; at intermediate composition (0.40 < x < 0.45) the alloys exhibit a double transition : a first one at T
M
is a spin-glass-like transition and a second one at T
c
> T
M
is from ferro- to paramagnetism; the alloys on the tin side (0.25 < x < 0.40) transform directly from spin-glass to paramagnetic state at T
M
or remain paramagnetic (x < 0.25) whatever the temperature.