Magneto-Elastic Wave Disturbances Caused by Thickness Fluctuations along the Fabricated Amorphous Ribbon

Abstract

Disturbances of the magneto-elastic wave amplitude along iron-rich amorphous ribbons (Fe₇₇Cr₂B₁₆Si₅, thickness h = 16-18 μm) were found caused by thickness fluctuations originating in their fabrication processes. The wave amplitude at each position depends on h^1.1-h^2.2 depending on sample preparation, and the wave damping factor on the frequency f and h as h³f², common for all samples. The wave amplitude was measured and represented by the EMF of a coil wound around the ribbon instead of the true magneto-elastic wave amplitude. The magnetic anisotropy constants and the angles were derived as a function of the thickness at each position. A negative correlation of these two factors was found as a function of the thickness deviations. The rapid quenching speed was first estimated at around 36 μs for a thickness range of 20 μm, estimated by the position discrepancies between the wave amplitude extrema and the corresponding thickness extrema. The wave amplitudes, the attenuation constants, the uniaxial magnetic anisotropy constants and their angles at each position along the ribbon, showed fluctuations of the same periodic distance as the peripheral length of the mono-role.