Reversals of magnetization and exchange-bias in perovskite chromite TmCrO3

Reversals of magnetization and exchange bias field were observed in polycrystalline perovskite TmCrO3. Interestingly, the sign reversal of exchange bias can be driven by both temperature and cooling field. The temperature dependence of exchange bias reversal takes place around 31 K and the sign reversal of exchange bias driven by cooling field occurs when the system exhibits positive exchange bias. The reversals can be elucidated based on the antiferromagnetic coupling between the canted Cr3+ moments and Tm3+ moments. This antiferromagnetic coupling will hinder or benefit the reversal of Cr3+ moments or Tm3+ moments when the system were cooled under different magnetic field. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.