Magnetic Viscosity Due to Solute Atom Pairs. Part II. Experimental Results

The theory of magnetic viscosity due to solute atom pairs has been verified on several bcc alloys. The results on Fe‐Si alloys with Si content up to 6% wt show that solute atom pairs give magnetic viscosity. If the strong effect of the temperature is taken into account, the induced anisotropy energy deduced from the viscosity field can be considered in agreement with the value measured directly from the magnetization curves. The results on a series of Fe‐Al alloys up to 25 at. % Al, where order occurs, further confirm the theory. The viscosity field is, with reasonable agreement, proportional to the number of solute atom pairs, as deduced from studies on ordering of the alloy and from the internal friction resulting from corresponding stress‐induced ordering.