Effect of CO gas on surface profile and magnetic properties of Fe–Si–B amorphous ribbons

Dong, Wen‐Kui; Bai, Guohua; Yi, Shengbo; Yan, Mi

doi:10.1007/s10854-019-01523-6

Cited by 1 publication

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“…The surface being in contact with the surrounding atmosphere and denoted as air-side is shiny and visibly smoother, contrary to the rough opposite wheel-side, which is in contact with the cooling wheel influencing its surface profile. The surface properties can play a key role in the bulk properties [ 3 , 4 , 5 ] and influence the giant magnetoimpedance (GMI) effect at higher frequencies [ 6 ], which are important for the construction of sensors based on the GMI [ 7 , 8 ] and the magnetoelastic [ 9 , 10 ]. Therefore, the surface microstructure in close connection with physical properties are objects of frequent studies using various surface-sensitive methods.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Magneto-Optical Hysteresis Loops of Amorphous and Surface-Crystalline Fe-Based Ribbons

et al. 2020

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Three Fe-based ribbon-type samples prepared by a conventional planar flow casting process are studied from the viewpoint of the amorphous Fe80Si4B16 and partially surface crystallized Fe80Si10B10, and Fe80.5Nb6.9B12.6, microstructures. Surface magnetic properties are investigated by magneto-optical Kerr microscopy, allowing the measurement of a local hysteresis loop from a selected area on the ribbon surface, and simultaneously, a domain structure corresponding to a definite point at the loop. For an amorphous sample, the changes in the slopes of hysteresis loops are related either to the size of the selected surface area, from which the loop is measured, or to the type, width, and movement of magnetic domains through this area. In the first case, the resizing of the area simulates an effect of changing the diameter of the incident laser beam on the magneto-optical properties of the ribbon. In the latter case, the observed wide-curved and fingerprint domains are responsible for markedly different shapes of the hysteresis loops at lower magnetic fields. If the surface is crystallized, the magnetic properties are more homogenous, showing typical one-jump magnetization reversal with less dependence on the size of the surface area. The magneto-optical experiments are completed by transmission electron microscopy and magnetic force microscopy.

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