Résumé
Magnetization measurements have been performed on single-crystalline Fe1.1Te in pulsed magnetic fields H⊥c up to 53 T and at temperatures from 4.2 to 65 K. At T=4.2 K, a nonreversible reorientation of the antiferromagnetic moments is observed at μ0HR=48 T as the pulsed field is on the rise. No anomaly is observed at HR during the fall of the field and, as long as the temperature is unchanged, during both rises and falls of additional field pulses. The transition at HR is reactivated if the sample is warmed up above the Néel temperature TN≃60 K and cooled down again. The magnetic field-temperature phase diagram of Fe1.1Te in H⊥c is also investigated. We present the temperature dependence of HR, as well as that of the antiferromagnetic-to-paramagnetic borderline Hc in temperatures above 40 K.