Correlation between magnetocrystalline anisotropy and the antisymmetric Dzyaloshinskii-Moriya interaction of Bi0.9Tb0.1FeO3

Abstract

Recent strategies propose doping bismuth ferrite to create innovative functionalities or enhance existing physical properties by distorting the local structure. In this study, we analyze the terbium-doped BiFeO3 system using a two-step conventional solid-state reaction to understand how structural modifications influence temperature-induced magnetization behaviors. Terbium-doped BiFeO3 crystallizes in R3c + Pnma phases, which suppress additional phases compared to pristine BiFeO3. The hysteresis loop of Bi0.9Tb0.1FeO3 varies linearly with the applied field at ambient temperature, and the magnetization increases by two orders of magnitude compared to pristine BiFeO3. At a temperature of 10 K, the M-H loop of Bi0.9Tb0.1FeO3 exhibits a wasp-waisted structure. Surprisingly, temperature-induced magnetization shows negative magnetization behavior until reaching the highest temperature range is measured. Below 33 K, the magnetization can switch to positive values. This magnetization reversal is attributed to the competition between magnetocrystalline anisotropy and the antisymmetric Dzyaloshinskii-Moriya interaction.