Abstract
In this work we present the study on structural and magnetic properties of ne cobalt nanoparticles coated by protective gold layer synthetized by microemulsion method. Structural measurements (powder XRD, HRTEM) con rmed spherical shape of the particles, their nanocrystalline character and presence of individual Co and Au phases. Investigation of magnetic properties of the particles revealed superparamagnetic behavior at higher temperatures and magnetic hysteresis at low temperatures. Average magnetic moment of individual particle mp ∼ 86.3μB was established. The critical temperature, below which the magnetic moments of the particles are blocked, was TB = 6 K. Investigation of magnetic relaxation processes via magnetic susceptibility, detected one maximum attributed to single relaxation process, present in the particles. Obtained data, interpreted in terms of Neel-Arrhenius and Vogel-Fulcher theoretical models, con rmed the presence of strong magnetic interparticle interactions.
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