Abstract
The longitudinal magnetic field dependence of low-frequency circular susceptibility, χ( H), is measured for (Fe 1− x Cr x ) 77.5Si 7.5B 15 ( x=0,0.05,0.1, and 0.15) amorphous wires of radius r 0=0.07 mm. In order to explain the experimental results, on the basis of the widely accepted core–shell model, we consider that there are a constant axial anisotropy K c in the core and a radius-dependent radial anisotropy K s∝ r 8/ r 0 8 in the shell, both K c and K s being functions of stress-energy constant λ s σ 0. A formula for χ( H) is derived from this model. The experimental data fits indicate that the magnetic structure can be well described by the improved core–shell model with reasonable values of λ s.
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