Abstract
A magnetic phase diagram of amorphous Fe 100- X Lu X was determined from AC susceptibility and remanent magnetization measurements. The alloys with 30≤ X ≤40 exhibit a spin glass behavior. The alloys with 10.5≤ X ≤25 are ferromagnetic, but show a reentrant spin glass behavior at low temperatures. The reentrant spin glass phase is divided into two phases with weak and strong irreversibility. The ferromagnetic state becomes unstable as X approaches to 8. For X =8, the ferromagnetic state disappears and a direct transition from the paramagnetic to spin glass state is observed. The high field magnetization measurements imply that the instability of ferromagnetism and the appearance of the spin glass state are caused by the development of antiferromagnetic interactions. In the reentrant spin glass state, the freezing of transverse components of spins is confirmed by the analysis of the Mossbauer spectra.
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