Abstract: This invention provides a ferromagnetic material Fe.sub.60 M.sub.x N.sub.y where M is at least one element selected from Al, Ga, In and Tl, N is at least one element selected from P, As, Sb and Bi, x has a range of 1.ltoreq..times..ltoreq.39 and x+y=40 and excluding Fe.sub.60 Ga.sub.X AS.sub.y. A preferred ferromagnetic material is Fe.sub.60 Ga.sub.x As.sub.y , preferably when x has a range of 3.ltoreq..times..ltoreq.37, more preferably when x has a range of 20.ltoreq..times..ltoreq.37, and even more preferably when x has a range of 30.ltoreq..times..ltoreq.37. Typically, ferromagnetic materials of this type can be homogenised by annealing or melt spinning. Melt spun Fe.sub.60 Ga.sub.x As.sub.y can show Curie Temperatures (T.sub.c) of about 470.degree. C. and saturation magnestions of about 89 emu/g. Typically a ferromagentic material of the Fe.sub.60 M.sub.x N.sub.y has a B8.sub.2 type structure.

Abstract: A ferromagnetic material having the formula MGa.sub.2-x As.sub.x where 0.15.ltoreq.x.ltoreq.0.99 and M represents one of Fe.sub.3, Fe.sub.3 partially substituted by manganese or Fe.sub.3 partially substituted by cobalt.