Magnetic Properties and Phase Diagram of Amorphous Fe-Lu Alloys

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A magnetic phase diagram of amorphous Fe,. ,. Lu. 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 showa reentrant spin glass behavior at low temperatures. The reentrant spin glass phase isdivided into two phases with weak and strong irreversibility. The ferromagnetic statebecomes unstable as X approaches to 8. For X = 8, the ferromagnetic state disappearsand a direct transition from the paran?agnetic to spin glass state is observed. The highfield magnetization measurements imply that the instability of ferromagnetism andthe appearance of the spin glass state are caused by the development of antiferromagnetic interactions. In the reentrant spin glass state, the freezing of transversecomponents of spins is confirmed by the analysis of the M6ssbauer spectra.[ amorphous alloys, ferromagnets, ferromagnetism, spin glass, magnetic phase ]l diagram, high field magnetization, AC susceptibility, M6ssbauer spectroscopy l
社団法人日本物理学会の論文
1991-12-15