The influence of grain size and impurities on the magnetic properties of the soft magnetic alloy 47.5% NiFe

On the Steinmetz hysteresis law

“…Two materials with very low magnetocrystalline anisotropy constant K 1 (less than 500 J/m 3 ) mumetal and MnZn ferrite, both show Steinmtez coefficient close to 2, more precisely 2.2 for ferrite and 2 for mumetal. An alloy with K 1 around 800 J/m 3 [11], Fe-48%Ni, on the other hand, shows a much smaller Steinmetz coefficient, 1.65, close to the values found for Fe-3.2% Si, q ¼ 1.73, and Fe-6.5% Si, q ¼ 1.75. Based on these data, neither K 1 alone nor the domain wall energy values can explain the behavior of the Steinmetz exponent.…”

Hysteresis loss subdivision

“…A similar approach was applied by Adler and Pfeiffer to the effect of grain size and inclusions on coercivity of FeNi alloy [3], whereas Sablik and Jiles [4] developed a synergistic approach to grain size and dislocation density based on Jiles and Atherton model [5].…”

Sensitivity of Conventional and Non-destructive Characterization Techniques to Recovery and Recrystallization

“…In an equiaxed polycrystalline sample the density of grain boundaries is inversely proportional to the grain size, so that a decrease in the grain size produces an increase in the total grain boundary density. Therefore, both in theoretical 24,27) and in experimental works, 25,[28][29][30] H c has been found to be directly proportional to the inverse of the grain diameter, The difficulty arises when analyzing a complex microstructure in which more than a predominant microstructural element is present. As an example, to the best of the authors' knowledge, the simultaneous influence in H c of the dislocation density and the grain size has not been previously analyzed, except for recrystallized microstructures with dislocation densities in the range of 10 10 -10 12 m…”