Experimental study of the magnetization processes in nanostructured soft magnetic materials

Abstract

Nanocrystalline soft magnetic materials (Fe 73.5Cu 1Nb 3Si 13.5B 9) are investigated at elevated temperatures where, by changing the crystalline volume fraction, the magnetic behavior changes from a regime dominated by hysteresis and relaxation effects (high crystallization levels) to a superparamagnetic behavior (low crystallization levels). At intermediate crystalline fractions, it is shown that the approach to saturation can be described by assuming, as it was previously done for the description of relaxation and hysteresis effects, the existence of clusters of coupled grains distributed in size.