The first results of measurements of the temperature and spectral depe
ndences of the circular magnetic dichroism in NiFe-Dy bilayer films ar
e reported. These results show that even at room temperature Dy in suc
h systems is ordered ferromagnetically to a large depth (similar to 60
0 Angstrom). (C) 1998 American Institute of Physics. [S0021-3640(98)00
705-1].