Abstract
There is an increase in demand of the next-generation spintronic devices with stable structural and magnetic properties in varying temperatures. An orthoferrites structure of the Pnma space group has been successfully prepared using high temperature solid-state reaction. In the Sm2Fe2O5+delta (SFO) material, Fe3+ ions occupy edge-cantered and face-cantered positions forming the tilted FeO6 octahedrons with Glazer's notation tilt a(-)a(-)c(+). The ordering of the rare-earth ions at compensation temperature (Tcomp=2.3K), spin-flip transition in the range of 9.4-45.6K, and a second-type spin-reorientation transition around the anisotropy barrier with lower and higher transitional temperatures, T-L=465 and T-H=480K respectively. The canting of spins along with disordered spins at the surface results in a non-zero Tcomp and unsaturated magnetization. It is inferred that thermal activation of particle's moment over the anisotropy barriers (known as Kneller's law) only occurs above room temperature.