ON THE ROLE OF A MAGNETIC COUPLING BETWEEN CRYSTALLINE GRAINS IN NANOCRYSTALLINE ALLOYS

Basic differences between magnetic properties of Fe-Cu-Nb-Si-B and Fe- Cr-Cu-Nb-Si-B nanocrystalline alloys are explained in terms of a magne tic coupling between nanocrystalline grains. It has been shown that in the magnetic behavior of Finemet alloy with high crystalline fraction the ferromagnetic exchange interactions plays the crucial role even a t temperatures above the Curie point of the amorphous phase. Much weak er magnetic interactions in Fe-Cr based alloys with low crystalline co ntents are responsible for the hardening of the material and rapid mag netic decoupling of the grains with increasing temperature.