Effect of the slight surface oxidation of ribbons on the dynamic magnetization of nanocrystalline soft magnetic ribbons

The effect of slight surface oxidation of ribbons of the optimal-annealed Nanoperm alloys on the dynamic properties of domain wall motion is studied. It is shown that the surface oxidation of ribbons may strengthen the domain wall pinning, make the number of domain walls unpinned from the initial sites decrease and the effective permeability measured smaller than the real value. Simultaneously, the existence of the surface oxidation layer may reduce the distance between the pinning sites of domain walls, which results in the relaxation frequency moving toward higher frequency. The condition of the ribbon surface is very important to the dynamic behavior of nanocrystalline soft magnetic ribbons.