Control of the Quality of Soft Magnetic Nanocrystalline Alloys in Terms of the Value of Magnetic Impedance

Resumo

The possibility of the use of the effect of magnetic impedance as a criterion for estimating the homogeneity of potentially amorphous melt-quenched alloys and for optimizing of the heat treatment mode of nanocrystalline soft magnetic alloy 5BDSR is considered. The measurements of the effect of magnetic impedance on small-section specimens cut from amorphous ribbons show the possibility of getting additional information on the variation of magnetic properties under nanocrystallization. The magnetic characteristics of alloy 5BDSR are shown to be unsteady after single-stage annealing by the modes standardized for this material. It is shown that double-stage heat treatment stabilizes the magnetic properties of the alloy and elevates these properties.