Magnetic properties and structures of some ordered (FeMn)₃Si alloys

Abstract

Magnetic and crystallographic properties of the (FeMn)3Si system have been studied by X-ray and neutron diffraction magnetization resistivity and magnetoresistivity measurements. The single-phase alloys have been found to crystallize in the L21A structure and to have ferromagnetic properties at low Mn concentrations. At higher concentrations the alloys exhibit a more complex behaviour, having antiferromagnetic components below a temperature TR which is almost concentration independent. The resistivity showed anomalies at TR as well as at the Curie point. The variation of the magnetic moment on each site has been determined as a function of concentration and is discussed in terms of environmental changes occurring as a result of Mn additions.