Abstract
Bi and Fe are mutually insoluble either in the solid or liquid states. However, metastable Fe–Bi alloys can be made using the rapidly quenching method. We have successfully prepared metastable Fe x Bi 1− x alloys over a wide composition range by DC magnetron co-sputtering. The X-ray diffraction results indicate that the magnetic Fe atoms are gradually replacing the Bi atoms in a rhombohedral structure for x<0.6. The magnetic measurements show that a spin-glass results with the freezing temperature increasing with x. In addition, a long relaxation characteristic time τ is observed which is about 20 h at room temperature. The slow relaxation behavior of the Fe–Bi system can be qualitatively explained from the picture that Bi has a large spin–orbit splitting.
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