Innovative study of superparamagnetism in 3 nm CoFe2O4 particles

Abstract

Cobalt ferrite particles of 3 nm were prepared through the solvothermal method. The obtained material is superparamagnetic in such a temperature range (161 K-room temperature) allowing a thorough investigation of the superparamagnetic phenomenon in this kind of magnetic system. The dependence of the superparamagnetic moment on temperature and magnetic field has been determined for such composition and particle size, obtaining values up to 5 × 10⁵ μ_B. In addition, three different analyses of the magnetic data reveal that at a temperature of 168 K the superparamagnetic behavior exhibits its highest intensity.