A new magnetic amorphous alloy system: (Fe,Co)-bismuth

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Abstract
We have synthesized, for the first time, amorphous alloy films of (Fe,Co)1–xBix. The amorphous alloys are most stable in a narrow composition range near x = 0.20, while above or below this composition (for 0.10⩽x⩽0.30), a predominant amorphous alloy along with Fe or Co and Bi metal is observed. The alloys are ferromagnetic and magnetization data indicate that the Fe or Co moments are little affected by the Bi content near x = 0.20 and are at least 95% of that for the pure magnetic metals. For the Fe-Bi alloys, a detailed characterization was made using x-ray, magnetization, Mössbauer, FMR, and differential scanning calorimetry (DSC) techniques. The DSC measurements show irreversible exothermic or combined exothermic-endothermic transitions over narrow temperature ranges up to 830 K. Their magnetization versus temperature plots exhibit discontinuous changes associated with the DSC transitions and Curie temperatures near 1020 K. The films display large uniaxial anisotropies perpendicular to the film planes. They are highly resistant to oxidation or tarnishing at room temperature.

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