Single-domain configuration tune high coercive field in Co-precipitated monazite-decorated cobalt ferrite nanoparticles

Single-domain configuration is one of the important key in the applied current- technology especially information technology. In order to address this issue, a magnetic modification of cobalt ferrite nanoparticles (CFO-NPs) by decorating the monazite-natural-mineral (Ce) is presented. Monazite-decorated CFO-NPs are successfully synthesized by the co-precipitation method. The obtained nanoparticle samples are annealed at 200 °C, 300 °C, and 400 °C for 5 hours. XRD results confirms the successful decoration of the monazite sand with CFO-NPs, as demonstrated by the distinctive peaks of CFO-NPs, as well as the major peaks of the monazite-sand. The presence of monazite in the CFO-NPs sample was confirmed by the EDS results. With increasing annealing temperature, the crystallite size increases, respectively. FTIR results show that the monazite-decorated CFO-NPs outcome absorption peaks at k_t ∼590/cm and k_o ∼390/cm, which are the original absorptions of CFO-NPs. VSM results showed that the single-domain configuration realized owing high the H_C (supported by K₁ and K_σ) for samples without and annealed at 200 °C, whereas the multi-domain configuration appears to have a small H_C (supported only by K₁) for samples annealed at 300 °C and 400 °C. The largest H_C of the monazite-decorated CFO-NPs was obtained with the annealing temperature at 200 °C, i.e., 3.02 kOe, suggesting that it be supported by both the K₁ and K_σ. The magnetic properties obtained also indicate the potential for developing permanent magnets.