Evidence of Spin Reorientation from Γ₄ to Γ₂ and Sign Reversal Exchange Bias in CeCrO₃ Nanoparticles

Herein, the temperature‐dependent magnetic structure and sign reversal exchange bias in CeCrO 3 using magnetization data and time‐of‐flight neutron diffraction data which is given less attention among RCrO 3 are investigated. While nuclear structural analysis using Rietveld refinement exhibits distorted orthorhombic structure within Pnma space group, temperature dependence of the magnetic structure using neutron diffraction reveals possible spin configurations, namely, Γ 4 , Γ 2 , and Γ 1 , within the temperature range of 6–300 K. Temperature‐dependent magnetization shows compensation temperature, T comp , at 58 K, spin reorientation temperature, T SR , at 15 K along with a Neel temperature, T N , at 260 K which is the outcome of the competition between canted antiferromagnetic ordering of Cr 3+ ions and Ce 3+ ions in CeCrO 3 . Furthermore, the magnetization versus magnetic field ( M vs H ) measurements indicate transition of the Γ 4 spin structure to Γ 2 spin structure around T SR which is further supported by reversible‐to‐irreversible changes observed in temperature‐dependent M FCC and M FCW . Moreover, a temperature‐driven sign reversal of exchange bias in CeCrO 3 is observed, resulting from the competition between antiferromagnetic coupling between chromium moment ( M Cr ) and cerium moment ( M Ce ) in these nanoparticles. This intriguing behavior holds significant potential for the development of thermally assisted magnetic random access memory.