Analysis of Local Properties and the Possibility of Modifying the Near-Surface Layers of Fe73(SiBNb)27 and (Fe65Co35)2B Ribbon Electrical Materials Produced by Melt Spinning

Scanning electron microscopy, atomic force microscopy, X-ray spectral microanalysis, and measurements of magnetic characteristics were used to analyze the local properties and several possibilities for modifying the near-surface layers of Fe73(SiBNb)27 amorphous ribbon electrical material, the same material with the addition of 1% copper, and the promising rare-earth-free hard magnetic material (Fe65Co35)2B. The materials were produced by melt spinning through ultrarapid cooling by spraying the melt onto a rapidly rotating copper drum. The surface of the (Fe65Co35)2B samples was found to have a pronounced fan-shaped texture. Several possibilities for modifying the near-surface layers of the Fe73(SiBNb)27 amorphous alloy with the addition of 1% copper by exposure to weak magnetic-field pulses were studied. Magnetic pulse treatment was found to produce a domain structure on the free surface of the foil (the surface not in contact with the drum). The nature of the domain structure and the magnetic properties of the foil depend on the parameters of magnetic pulse treatment.