The LPCNO has a strong expertise on the developmentof rare-earth-free magnets using adirected assembly approach of elementary building blocks (Fig 1a). To date, this work has beencarried out on Co nanorods (NRs), synthesized by seeded growth (Fig 1b), and has led to high-performance integrated magnets [3,4]. The CEA-LIONSis known, among others, forsucceeding in breaking the symmetry of Au, leadingto the synthesis and characterization ofAu nanorods using the seeded growth method [5,6]. At the crossroad between these twolaboratories, the aim of this PhD will be to transpose the seeded growth method on Fe NRs.An exploration of the range of parameters (nature of seeds, growth conditions, ligandconcentration) will be undertaken using conventional synthesis and microfluidic chips. Theparticles at the different stage of the reaction will be characterized by X-ray scattering (SAXS,WAXS), electron microscopy (TEM and SEM), diffraction (XRD) and magnetometry (VSM).Eventually, in-situ SAXS and WAXS experiments willbe performed combining the microfluidicchip, synchrotron radiation and AI models to determine the optimized synthesis parameters.The work will be mainly conducting at LPCNO, Toulouse with short stay visit at CEA-Lions inorder to perform SAXS/WAXS experiments. The candidate will work in close collaboration withthe two other PhD students involved in the projectand working on the AI models and on thefabrication of the microfluidic chip.