Magneto-optical properties of a magneto-plasmonic nanofluid based on superparamagnetic iron oxide and gold nanoparticles

In this investigation the magnetic and plasmonic properties of nanomagnetic Fe₃O₄ and gold nanorods are combined by synthesizing a magneto plasmonic nano fluid. They are then examined by probing the enhanced magneto-optical properties such as linear dichroism and Faraday rotation. The nanofluid is excited to transverse excitation of gold nanorods by a laser and the magneto-optical response of this ferrofluid is investigated. The results are compared with gold nanospheres incorporated magnetic nano fluids. The structural cascading of rods into chain-like structure in the presence of an applied magnetic field enables the electric field enhancement leading to improved dichroism and faraday rotation. These fluids can be used for biomedical applications such as targeted drug delivery and magnetic hyperthermia. The aspect ratio of the gold nanorods can be tuned to suit the absorption and hence such fluids can be a potential via media where in magnetic hyperthermia and photodynamic therapy can be combined.