Virtual magnetic domain wall motion in discrete magnetic nanodot chains

Abstract

Dynamic behavior of a magnetization state transfer is investigated in L-type arrayed discrete ferromagnetic nanodot chains by means of micromagnetic simulations. Under magnetic driving fields, magnetization state transfer behaviors are examined intensively with the variation of the discrete nanodot geometry and dimension in magnetic chains, which is similar to a virtual magnetic domain wall motion. In the magnetic chain system, a stepwise-propagating behavior of the virtual magnetic domain wall is clearly observed without the Walker breakdown phenomenon, if the geometric ratio of magnetic nanodots becomes larger. Interestingly, the average velocity of virtual domain wall in different magnetic chains is almost same under each onset field even is proportional to the ratio of the external field to the onset field, which should be attributed to the contribution of the opposite dipolar field interaction between adjacent nanodots in ferromagnetic chain systems.