Magnetic Properties of New High Coercivity Cu-Mn-Sb Alloys

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  • 新高保磁力Cu-Mn-Sb系合金の磁性について
  • シン コウホジリョク Cu-Mn-Sbケイ ゴウキン ノ ジセイ ニ ツイテ

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Magnetic properties of Cu-Mn-Sb alloys containing 4.98∼59.80% of Mn and 10.03∼79.71% of Sb have been measured. It has been found that the alloys consisting of about 17∼40%Mn, 10∼54%Sb and 9∼65%Cu show high coercive forces when tempered at 150°∼650°C after chill casting and the alloy consisting of 22.04%Mn, 33.00%Sb and the rest Cu exhibits the highest coercive force, IHC, of 2000 Oe and a residual intensity of magnetization, Ir, of 12 G. Further it has been determined by means of electron microscopic observation and X-ray analysis that these alloys of high coercive force contain many acicular fine particles of ferrimagnetic compound Mn2Sb dispersed in the matrices of nonmagnetic compound CuMnSb and nonmagnetic αCu phase. The high coercivity of these alloys is probably caused by the anisotropy energy of these small particles composed of a single magnetic domain.

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