Abstract
From the magnetization and Mössbauer measurement it was found that the magnetic state of intermetallic compound Hf 0.8 Ta 0.2 Fe 2 is ferromagnetic below 150 K and antiferromagnetic between 150 and 338 K. Above 150 K a phase transition from antiferromagnetic to ferromagnetic state is induced by an external magnetic field and the magnetization curve shows a hysteresis. The result is consistent with that of the recent theoretical study by Moriya and Usami on the coexistence of ferro- and antiferromagnetism in itinerant electron system.
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