Magnetization Sign Reversal, Exchange Bias, and Griffiths-Like Phase In Orthorhombic Perovskite Pr2FeMnO6
ASWATHI (K), JASNAMOL (P P), MANOJ RAAMA VARMA
Pr2FeMnO6; Negative magnetization; Exchange bias; Griffiths-like phase
Journal of Magnetism and Magnetic Materials
- •Orthorhombic Pr2FeMnO6 shows negative magnetization at low applied magnetic fields.
- •The interaction between two magnetic components leads to the negative magnetization.
- •The transition from ferromagnetic to paramagnetic phase is observed at Tc?=?576?K.
- •Exchange bias observed below 200?K is due to magnetic exchange anisotropy.
- •Short range ferromagnetic correlation lead to Griffiths-like phase in Pr2FeMnO6.
The perovskite Pr2FeMnO6 has been synthesized by citrate-gel combustion method. The material has an orthorhombic crystal structure with Pbnm space group. The presence of Fe3+ and Mn3+ cations in the material are confirmed by XPS analysis. A magnetization sign reversal is observed for the material at low-temperatures in low applied magnetic fields. When the applied field or temperature is increased, the negative magnetization got diminished. Such a sign reversal of magnetization is observed for the material as a result of the interaction between components of paramagnetic Pr3+ and Mn3+ moments opposite to the component of the ferromagnetic Fe3+moment or the anti-aligned Fe –rich regions to that of Mn-rich regions containing with Pr3+. Negative exchange bias is also exhibited by Pr2FeMnO6 below 200 K which can be ascribed to the Dzyaloshinskii-Moriya interaction and magnetic exchange anisotropy. A high-temperature magnetic transition at TC = 576 K is identified for the material from the thermomagnetic data. From the detailed analysis of the thermomagnetic data, the presence of ferromagnetic short-range correlations is observed far above the TC, which suggests a Griffiths-like phase with Griffiths temperature at TG = 681 K.