PCパーマロイ合金の磁気特性に及ぼす主成分バランスについて

概要

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The effect of main element upon magnetic properties was studied, using Fe-Ni-Mo-Cu and Fe-Ni-Mo magnetic alloys melted by plasma arc induction furnace. A test was made after arranging specimens of almost same grain size and keeping the cooling rate constant. The test data were examined on the base of an idea that valence electrons of added element enter unoccupied 3d states of Ni atoms. It was confirmed that the calculated value of saturation magnetization 4πIs coincides roughly with the observed value, taking the magnetic moment of Fe and Ni atom 2.8μB and 0.6μB respectively.The relation represented by P2=60-0.6(1+P1)·CFe was found, where P1=magnetic Ni (at%)/CFe, P2=∑CiZi, Ci; at% of added element i, Zi; valence electrons of added element i and CFe; Fe at%. The composition of complex Fe-Ni magnetic alloys can be decided by using P1, P2 or CFe. High permeability can be obtained at composition balance P1=3.3 for both Fe-Ni-Mo-Cu and Fe-Ni-Mo alloys. Composition dependence of permeability of Fe-Ni-Mo alloys shows sharper peak in comparison with Fe-Ni-Mo-Cu alloy.
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