Spin reorientation temperatures for the (DyxEr1-x)Fe11Ti system have b
en determined from measurements of ac susceptibility and angular-depen
dent magnetization. The magnetic phase diagram calculated with the par
ameters given by Hu et al. shows good agreement with our data, except
in the Dy-rich region at low temperatures. This result suggests that s
ome allowance for the temperature dependence of the second-order axial
CEF parameter should be made.