Micromagnetic simulations of magnetostatically coupled nickel nanowires

Magnetic structures and magnetization processes in arrays of closely packed Ni nanowires (length l=1 mum, diameter d=40 nm, and period: 100 nm) are in vestigated by means of micromagnetic modelling. The simulations are perform ed with an algorithm based on the finite element method combined with the b oundary element method which allows for the accurate calculation of magneto static interactions. Magnetization states of Ni nanowires at zero field are calculated. Only few, simple magnetization configurations result to be sta ble. Transient states of the magnetization indicate that magnetization reve rsal occurs by means of nucleation at the ends of the particles and subsequ ent soliton propagation. Hysteresis loops of up to 16 interacting nanowires are simulated. It turns out that magnetostatic interactions between the wi res have a significant influence on the switching field. (C) 2001 American Institute of Physics.