MAGNETIC-PROPERTIES OF BALL-MILLED FE-40AL AT.PERCENT ALLOYS

A direct correlation between the lattice parameter and the saturation magnetization, during the disordering (ball milling) and posterior reo rdering (annealing) processes, has been found in Fe-40Al at.% compound s. These results indicate that the paramagnetic-ferromagnetic-paramagn etic transitions induced by ball milling and subsequent annealing coul d be related to the changes in volume, and not only to nearest neighbo rs effects as is commonly assumed. Moreover, these alloys have been fo und to become spin glass at low temperatures, independently of their s tructural state (ordered or disordered).