Dynamics of magnetic moments of a nanoscopic array

TL;DR

This paper simulates the magnetic dynamics of nanoscopic arrays, reproduces experimental hysteresis loops, and finds no evidence of fractal or critical behavior in the system.

Contribution

It introduces a simulation of magnetic dynamics in nanoscopic arrays using the Pardavi-Horvath algorithm and analyzes their criticality and fractal properties.

Findings

Reproduces experimental hysteresis loops for Ni arrays.

Finds no fractal behavior in magnetic cluster analysis.

Shows local magnetic flips do not lead to criticality.

Abstract

Dynamics of nanoscopic arrays of monodomain magnetic elements is simulated by means of the Pardavi-Horvath algorithm. Experimental hysteresis loop is reproduced for the arrays of Ni, with the period 100 nm and the mean coercive field 710 Oe.We investigate the box-counting fractal dimension of a cluster of elements with given orientation of magnetic moments. No fractal behavior is found. Also, the damage spreading technique is applied to check the criticality. We find that the consequences of a local flip of one magnetic element remainlimited to a finite area. We conclude that the system does not show a critical behavior.