The role of the inhomogeneous demagnetizing field on the reversal mechanism in nanowire arrays

Abstract

The magnetization behavior of nanowires arranged in an array is strongly influenced by the strength and shape of the demagnetizing field experienced by the individual nanowires. In order to understand the initial stage of the reversal process in nanowire arrays a hybrid method is proposed. First, an expression for the numerical calculation of the demagnetizing field in nanowire arrays is presented and compared to already available approaches. The derived expression calculates the demagnetizing field as a function of position along the length of an individual nanowire embedded in the array. In a second step, a micromagnetic simulation of the reversal process of a an isolated nanowire (1 μm) is superimposed with the earlier obtained field distribution. This enables including the inhomogeneity of the demagnetizing field of a large array (≈108 nanowires) into the micromagnetic simulation without the need of particularly large computing power. The simulation results show that in contrast to the switching in a single nanowire, where the reversal starts at the nanowire ends, the reversal under the influence of the array field strongly depends on the magnetization state of the whole array. Reversal can start either at the nanowire’s central region or at its ends.

Remagnetization in arrays of ferromagnetic nanostripes with periodic and quasiperiodic order

“…This study shall give us additional information about the magnetization switching and the influence of geometrical parameters on this process. 16,18 We consider an array of rectangular prisms (Fig. 1), with dimensions and separating distances being the same as in the experimental samples.…”

“…16 In the array of MEs, the magnetization reversal process is additionally influenced by the stray magnetic field from all other MEs in the array. 17,18 Interestingly, in the array the magnetostatic interactions from distant elements can result in indirect coupling and even screening of the interactions from nearest elements. For this purpose, the inter-element spacing along the two perpendicular directions has been introduced in the triangular lattice of elongated MEs.…”

Effect of interactions and non-uniform magnetic states on the magnetization reversal of iron nanowire arrays

“…However, in recent years, some progress has been made in this area [28]. Nevertheless latterly exciting analytical models of nanowire arrays remagnetization have been proposed [29,30,31,32,33,34]. It is interesting to compare them with micromagnetic simulations and experiments in the case of some new systems.…”