Optimum condition for magnetic properties of two-phase soft magnetic alloys

It is well-known that the optimum condition to obtain the highest permeability and lowest coercive force for a soft magnetic material is that both K and λs are very small. In this paper, it is suggested that this optimum condition is sufficient only for the single phase soft magnetic material. For the material containing two phases, in order to obtain the best magnetic properties, a new condition must be added; the difference in the magnitude of the saturation magnetization of the two phases, ΔMS, should be very small. Only when the K, λs, and ΔMS are all very small can the best soft magnetic properties be obtained. A model describing the hindrance of the domain well motion by the ΔMS effect is suggested. Some examples in the nanocrystalline soft magnetic alloys are used to demonstrate the existence of the ΔMS effect.

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