MAGNETIC-PROPERTIES OF DYFE6AL6 COMPOUND STUDIED BY MAGNETOSTATIC ANDMOSSBAUER METHODS

Magnetic investigations of DyFe6Al6 compound showed that it is a ferri magnet with the Curie temperature T(C)=316 K and with a relatively str ong magnetocrystalline anisotropy. Below 130 K all phenomena character istic for spin glass behaviour were observed i.e. marked thermomagneti c hysteresis, time dependence of magnetization, inflection point in ma gnetic isotherms, an unusual shape of the hysteresis loop and a very l arge rotational hysteresis. Mossbauer absorption spectra below the Cur ie temperature were best described by the magnetic fields distribution which proves the magnetic disordering in the Fe sublattice. From the analysis of temperature dependence of magnetic fields distributions it follows that about 30% of the Fe atoms start to order below 130 K. Th e results obtained suggest that magnetic ordering in the Fe sublattice is responsible for the magnetic behaviour or DyFe6Al6 compound below 130 K.