Our research activities have been focused on the modeling of structural, magnetic and dynamical properties of nanostructured magnetic materials through the application of numerical techniques including Monte Carlo simulations and electronic structure calculations.
Current research topics include
 Nanoparticle systems and films
 Magnetic semiconductors at the nanoscale
 Perovskites for energy harvesting
Magnetic behaviour of nanoparticle systems for biomedical , magnetic recording and energy applications
The properties of magnetic nanoparticles are dramatically different from those of the bulk materials. They are modified by the presence of the nanoparticle surface, of defects and of a different magnetic phase. The aim of our work is to reveal the various factors that control the magnetic behavior of nanoparticles and suggest optimum parameters for magnetic recording and magnetic hyperthermia applications and energy applications.
Assemblies of magnetic nanoparticles (NPs) are met most often in naturally occurring systems and in manmade structures such as granular solids, patterned structures, selforganized arrays. Interparticle interactions have inevitable effects on the global magnetic behavior of a sample and introduce a rich structure to the phase diagram of the assembly as the packing density increases. The magnetic domain structure is rather complex due to competition between the short range exchange forces acting between nanoparticles "incontact" and the long range dipolar interactions.
Magnetic Ferrofluids
When magnetic nanoparticles are allowed to move in a carrier, driven by thermal agitation (Brownian motion) and their mutual interactions (magnetostatic), they tend to form well defined shapes such as chains and loops, or more complicated structures such as branching points and labyrinths, whose statistical morphology can be characterized as a fractal. The potential of systems with a nonmagnetic liquid carrier, known as ferrofluids, in medical applications (drug delivery) and technological applications (magnetic field sensors) brings these systems at the frontiers of current scientific interest. The aggregation mechanism and the resulting fractal morphology depend on internal parameters (particle size distribution, magnetic moments, particle shape, interparticle interactions, particlecarrier interactions, particle density) and external conditions (temperature, applied field). Physical properties such as magnetization, momentmoment correlation function and magnetooptical properties (refraction index) are characterized by scaling exponents that are strongly dependent on the growth conditions of the aggregate.
Diluted magnetic Semiconductor Nanostructures
We investigate the microscopic mechanism of ferromagnetism in IIVI and IIIV semiconductor nanostructures containing a random distribution of magnetic ions, usually Mn. In our study we combine Monte Carlo simulations of the magnetic structure with total energy calculations performed by an exact diagonalization of the Hamiltonian for the coupled carrierlocal moments system.
Perovskites for energy harvesting
In the area of photovoltaic materials, we are looking at novel compounds, like perovskites of the form Cs_{2}SnX_{x}Y_{6x}, X, Y=Cl, Br, I, which are promising in terms of both stability and efficiency. Density Functional Theory techniques are employed, in order to predict properties of interest (band gap and band structure, transport properties etc.).
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