Аннотация:Abstract—Using scanning electron, optical, and scanning probe microscopy, the surface structure of unannealedamorphous electrical engineering alloys—foils with the composition Fe73(SiBNb)27 and alloys of thesame composition with the addition of 1% Cu, obtained by ultrafast cooling via melt spinning onto a rotatingcopper drum—was studied. On the free surfaces of the foils not in contact with the rotating drum, microformationsand irregularities in the form of “micropoints” with characteristic sizes below 0.5 μm were found;these may, during the operation of electrical products, initiate electric field gradients on the foil surface.Exposure to underwater plasma did not lead to any change in the magnetic properties of the studied materials.In the Fe73(SiBNb)27 foil with the addition of 1% Cu, treated with 10 and 40 pulses of a low-frequency (10–20 Hz), weak magnetic field (10–100 kA/m), magnetic contrast was observed: in phase contrast mode, exposureto 40 magnetic field pulses produced triangular features associated with the formation of closing prismaticdomains, whose domain wall width is approximately 1–2 μm; after exposure to 10 magnetic fieldpulses, a specific magnetic contrast pattern was observed over the entire studied foil area. A weak dependenceof specific magnetization on the number of magnetic pulses was also observed for the Fe73(SiBNb)27 foil with1% Cu: increasing the number of pulses led to a slight decrease in specific magnetization
