THE MAGNETIC-PROPERTIES OF ULTRATHIN FEBNBCU NANOCRYSTALLINE ALLOY

The magnetic properties of ultrathin Fe83B9Nb7Cu1 nanocrystalline allo y ribbons with 7 similar to 12 mu m thickness and effect of insulation coating on ultrathin ribbons a ere investigated. It was found that ef fective permeability at the frequency below 100 kHz decreased and coer cive force increased with decreasing the ribbon thickness. However, re duction of ribbon thickness to 7 mu m was very effective to improve re markably their permeability and the core loss characteristics up to th e MHz frequency range. Furthermore, the soft magnetic properties were largely enhanced by surface coating comparing to that of the uncoated ribbons. From these results, we could produce new core materials with very low magnetic loss applicable to MHz excitations.