Hard magnetic properties observed in bulk Mn1−xGax

Mn-Ga binary alloys have shown promising magnetic properties, even though these alloys contain no rare-earth metals. Both theoretical predictions and experimental work have indicated that nanoscaled Mn-Ga samples (thin films) possess remarkable magnetic properties. Whether the same properties occur in macroscale ingots, however, require the investigation and production of bulk materials, which are needed for majority of the applications that require a strong magnetic field. We have used mechanically milling followed by heat treatment to produce bulk Mn1−xGax alloys. In this paper, we report annealed Mn1−xGax bulk composites that exhibit coercivity up to 18.8 kOe.