Neutron depolarization and diffraction measurements were performed on bcc C
r60Fe20Mn20 with the aim of studying the low temperature reentrant spin-gla
ss phase. This alloy is reported to undergo successive magnetic transitions
as the temperature is lowered, viz, antiferromagnetic, ferromagnetic and s
pin glass. Transmitted neutron polarization was measured as a function of t
emperature for zero-field-cooled (ZFC) and field-cooled (FC) cases. The tra
nsition to a ferromagnetic phase is indicated by a decrease in the polariza
tion at T-C similar to 100 K. It exhibits a minimum at 55 K below which it
increases and at 14 K, in the spin-glass phase, for the ZFC case it recover
s to the paramagnetic value. Large irreversibility and time dependent effec
ts are also observed in the spin-glass phase. These results indicate that t
he ferromagnetic order which grows below T-C is destroyed in the spin-glass
phase at 14 K. Neutron diffraction measurements indicate the presence of a
n antiferromagnetic (100) peak below T-N similar to 290 K. The intensity of
the (100) peak increases as the temperature is lowered and persists down t
o 15 K. The low temperature phase is, therefore, a mixed phase where spin-g
lass and antiferromagnetic order coexist.