Magnetic properties of Fe-rich amorphous Fe-La alloys

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Abstract
A magnetic phase diagram of Fe-rich amorphous Fe100-xLax alloys has been determined from high-field magnetisation and AC susceptibility measurements. The alloys with x>10 are ferromagnetic, but show a reentrant spin glass behaviour at low temperature. The ferromagnetic state becomes unstable when x approaches 10. For x<or=10, the ferromagnetic state disappears and a direct transition from a paramagnetic to a spin glass state is observed. Extrapolation of the phase diagram to x=0 suggests that pure amorphous Fe is no longer a ferromagnet but a spin glass with a freezing temperature of about 110K. The irreversible process of magnetisation characterising the theoretically proposed spin glass picture has been observed in the low-temperature phases of the alloys.

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