High-field irreversible moment reorientation in the antiferromagnet Fe$_{1.1}$Te

TL;DR

This study investigates the irreversible reorientation of antiferromagnetic moments in Fe$_{1.1}$Te under high magnetic fields, revealing a non-reversible transition at 48 T at low temperatures and mapping the magnetic phase diagram.

Contribution

The paper reports the first observation of a non-reversible moment reorientation in Fe$_{1.1}$Te at high magnetic fields and characterizes its temperature-dependent phase diagram.

Findings

Irreversible moment reorientation at 48 T at 4.2 K

Reactivation of transition above Néel temperature

Detailed magnetic phase diagram of Fe$_{1.1}$Te

Abstract

Magnetization measurements have been performed on single-crystalline Fe$_{1.1}$Te in pulsed magnetic fields $\mathbf{H}\perp\mathbf{c}$ up to 53 T and temperatures from 4.2 to 65 K. At $T=4.2$ K, a non-reversible reorientation of the antiferromagnetic moments is observed at $\mu_0H_R=48$ T as the pulsed field is on the rise. No anomaly is observed at $H_R$ 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 $H_R$ is reactivated if the sample is warmed up above the N\'{e}el temperature $T_N\simeq60$ K and cooled down again. The magnetic field-temperature phase diagram of Fe$_{1.1}$Te in $\mathbf{H}\perp\mathbf{c}$ is also investigated. We present the temperature dependence of $H_R$, as well as that of the antiferromagnetic-to-paramagnetic borderline $H_c$ in temperatures above 40 K.