Micromagnetic simulation of finite and infinite-size Fe nanowire arrays

The article presents some results of ICPE-CA research for the development of new permanent magnets based on nano ferromagnetic wires without rare earths or other expensive raw materials. The paper presents the results of the modeling of some spatial arrangements of the iron nanowires. Several ratios between the base area and the length of the wire are considered. Hysteresis loops show how the properties of the entire configuration are influenced depending on the geometry of the nanowires and their arrangement. The micromagnetism model started from the definition of the types of energies that compete with each other and that define the magnetic properties. The simulations show that for nanowires with aspect ratio L/ℓ ≥ 10 they can be treated as infinitely long nanowires. Study of finite and infinite-size arrays of nanowires shows that the hysteresis loops converge to an oblique shaped loop with coercive field larger than 100 kA/m.