Single crystals of DyEr thin film alloys have been prepared by Molecul
ar Beam Epitaxy. Magnetization and neutron scattering data obtained fr
om a 3000 Angstrom thick Dy50Er50 sample show that the magnetic behavi
our of the film is close to that of the bulk. Accurate data of the the
rmal dependence of the turn angle of the helical phase, of the critica
l field at which the ferromagnetic order is induced and of the c-param
eter are presented.