The Effect of Co-Doping on the Structural and Magnetic Properties of Single-Domain Crystalline Copper Ferrite Nanoparticles

Nanoparticles of Co-doped copper ferrite, Cu0.75Co0.25Fe2O4, were successfully synthesized by hydrothermal method. The preparation conditions optimized to produce small nanoparticles with crystallite size 20 nm that fall into the single-domain regime. influence Co-doping on structure and magnetic properties pure CuFe2O4, was investigated. prepared ferrite found be in a single structural phase spinel-type structure, according XRD FT-IR measurements. When compared Cu addition Co increased lattice constant decreased density. TEM results confirmed spherical morphology nanoparticles. For entire temperature range nanoparticles, magnetization measurements showed ferrimagnetic phase. It observed coercivity remanent decreasing temperature. Magnetic anisotropy increase comparison ferrite. ZFC–FC curves blocking (TB) is above room temperature, demonstrating they are at below. Additionally, it field lowers TB. FC below TB nearly flat, indicating spin-glass behavior might attributed nanoparticle interactions and/or surface effects such as spin canting disorder.