In this work, magnetic and optical properties of magnetic nanoparticles were investigated,
where the particles of iron oxide were prepared with a co-precipitation route and
the component of gold was built up by reduction of AuCl4- on the surface of iron oxide
to assemble nanocomposite structures in the form of an electrostatic stabilized suspension.
The size of the particles obtained with TEM increased from of 8,9 +/- 2.7 to 16 +/-
6 nm after the procedure of hybridisation. In order to distinguish the impact of the
gold on the optical properties, UV-Vis and Raman spectroscopy techniques were used.
Magnetic properties were studied in the temperature range of 5-300 K and the superparamagnetic
state of MNPs at room temperature was confirmed for both systems.