Magnetic state of iron-nickel-manganese alloys

The magnetic diagram of ternary Fe - Ni - Mn alloys is determined. Regions of the existence of long-range ferro- and antiferromagnetic ordering are demonstrated. A transition region is shown to exist in which long-range magnetic order is absent but in which strong short-range ferro- and antiferromagnetic order occurs. This is due to the mixed nature of exchange interaction between atoms in the alloys. This leads to various types of short-range magnetic order in the statistical fluctuations of atoms which depend on the immediate environment. The principal alloy magnetic state involving randomly distributed regions of short-range ferro- and antiferromagnetic order which interact via the disoriented spin zone may be called mixomagnetic in contrast to spin glasses and mictomagnets