Abstract
Some amorphous Er–Co alloys, have been studied by examining their normal magnetization curves with both hysteresis major and minor loops. Rayleigh parameters from hysteresis minor loops allowed to describe the low-field behaviour of the magnetization: (i) the increase of χ m is in a good agreement with Rayleigh laws but a weak deviation is observed on the thick samples at fields up to 100 Oe, which can be due to magnetostatic effects; (ii) the ratio αH c/ χ 0 is close to 1 for the thin sample (0.1 μm) as predicted by the Néel theory.
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