Self-organized magnetization in arrays of bistable nanowires

Abstract

Summary form only given. The study of arrays of magnetic nanowires is attracting emerging interest because of their importance concerning micromagnetics of magnetisation reversal and for their future application in high density perpendicular recording media. Most interesting nanowires exhibit bistable behaviour characterised by square hysteresis loop originated by the magnetisation reversal between to stable remanent states by a single Barkhausen jump. This is typical of nanowires with longitudinal easy magnetisation direction induced by shape and other magnetic anisotropies. Uncompensated poles at the ends of bistable wires generate stray fields in the neighbourhood so that, nanowires in an array are magnetostatically coupled. Hysteresis loops then exhibit as many jumps as number of wires as reported experimentally and theoretically. In the present work, the magnetic behaviour of arrays of bistable nanowires is simulated considering hexagonal, cubic and random geometrical symmetries.