A ferromagnetic Pd97.5Mn2.5 alloy single crystal was studied by neutron sca
ttering and susceptibility measurements. The diffuse satellite peaks along
the [1 0 0] axis were observed for the ferromagnetic alloy. The diffuse sat
ellite peaks, however, disappeared under a magnetic field of 5 T applied al
ong the [0 0 1] direction perpendicular to the (0 0 1) scattering plane. Co
mbined with the susceptibility data, we discuss several models for the ferr
omagnetic state of the dilute PdMn alloy.