ABSTRACT
This chapter describes the most developed methods to grow high-aspect-ratio ferromagnetic particles emphasizing the morphological and structural properties because these are the key point to understand the resulting magnetic properties. It also describes the magnetic properties of assemblies of elongated ferromagnetic particles in which the dipolar interactions can play an important role. The chapter focuses on studies on the magnetic properties of single elongated ferromagnetic particles comparing modelling and experimental results. Ferromagnetic nanoparticles with a high-aspect-ratio exhibit a strong magnetic anisotropy that has strong effects on the magnetic configuration of their remanent state and on their magnetization loop. Several methods were developed to grow ferromagnetic particles with high-aspect-ratio, liquid-phase chemical synthesis, electro-chemical growth using solid host template and physical deposition. Micromagnetic modelling was very useful to describe the magnetization reversal in anisotropic objects as a function of their shape, diameter, aspect ratio and packing fraction in an assembly.
