| 摘要 |
PURPOSE:To obtain a low magnetic strain constant, a high saturated magnetic flux density, high permeability, and superior corrosion resistance, by specifying a composition ratio in a magnetic film of Fe-Si-Ru system alloy. CONSTITUTION:A thin film of Fe-Si-Ru system alloy comprises Si composition of more than 8.5wt% to 12wt% or less, Ru composition of 0.05wt% or more to less than 5wt%, and Fe as its remnant. The composition ranges on the side of a magnetic strain negative constant, rather than on the side of the positive constant. The ferromagnetic thin film in such a composition has the magnetic strain constant ranging from 0.2X10<-6> to -0.5X10<-6>, and besides being characteristic of the saturated magnetic flux density Bs>13KG and coersive force Hc<2.0 Oe in the same composition. When an element selected from Rh, Pd, Ag, Os, Ir, Pt, and Au is added to such a Fe-Si-Ru system alloy, by less than 5wt% with it totalled to Ru, corrosion resistance can be remarkably improved without deteriorating a magnetic characteristic such as coersive force so much.
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