FERROMAGNETIC MATERIALS

• Main Authors: SMITH, NIGEL A, HARRIS, IVOR R, COCKAYNE, BRIAN, RITCHIE, WILLIAM
• Format: Patent
• Language: English; French
• Published: 17.09.1991
• Edition: 5
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; INDUCTANCES; MAGNETS; METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

This invention provides a ferromagnetic material Fe60M x N y where M is at least one element selected from Al, Ga, In and T1, N is at least one element selected from P, As, Sb and Bi, x has a range of 1 ~ x ~ 39 and x + y = 40 and excluding Fe60Ga x AS y. A preferred ferromagnetic material is Fe60Ga x As y, preferab ly when x has a range of 3 ~ x ~ 37, more prefer- ably when x has a range of 20 ~ x ~ 37, and even more preferably when x has a range of 30 < x ~ 37. Typically, ferromagnetic materials of this type can be homogenised by annealing or melt spinning. Mel t spun Fe60Ga x As y can show Curie Temperatures (T c) of about 470 .degree.C and saturation magnetisations of about 89 emu/g . Typically a ferromagnetic material of the Fe60M x N y has a B8 2 type structure. 2074161 9114271 PCTABS00007 This invention provides a ferromagnetic material Fe60MxNy where M is at least one element selected from A1, Ga, In and Tl, N is at least one element selected from P, As, Sb and Bi, x has a range of 1 Í x Í 39 and x+y = 40 and excluding Fe60GaxASy. A preferred ferromagnetic material is Fe60GaxAsy, preferably when x has a range of 3 Í x Í 37, more preferably when x has a range of 20 Í x Í 37, and even more preferably when x has a range of 30 Í x Í 37. Typically, ferromagnetic materials of this type can be homogenised by annealing or melt spinning. Melt spun Fe60GaxAsy can show Curie Temperatures (Tc) of about 470 ·C and saturation magnetisations of about 89 emu/g. Typically a ferromagnetic material of the Fe60MxNy has a B82 type structure.