Investigating the formation and magnetic properties of the Dy0.75Fe1.25O3 orthoferrite prepared by sol-gel method

In this paper, the Dy0.75Fe1.25O3 orthoferrite nanoparticles were synthesized successfully by sol-gel method. Dy0.75Fe1.25O3 orthoferrite nanoparticles are obtained by calcining the flakes at 600 and 700 deg. C. The magnetic properties of the different samples are investigated using Quantum Design MPMS SQUID magnetometer and MS-500 Moessbauer spectrometer. Magnetic phase γ-Fe2O3 coexists in the samples calcined at 600 deg. C and orthoferrite phase is completely recovered in the samples calcined at 700 oC. Although excessive Fe3+ ions were introduced, none of these iron spins couple magnetically with Dy3+ ions.