Remanence and switching sensitivity in nanodot magnetic arrays

TL;DR

This study uses computer simulations to analyze how remanence magnetization and stability in nanodot magnetic arrays depend on array size and variability in switching fields, revealing optimal conditions for stability and magnetization.

Contribution

It provides new insights into the effects of array size and switching field variability on magnetic stability and remanence in nanodot arrays through simulation.

Findings

Remanence magnetization decreases with array size.

Stability in an oscillating field increases with the standard deviation of switching fields.

Optimal stability and magnetization occur at intermediate variability levels.

Abstract

New results are reported of the computer simulations on the magnetic behaviour of magnetic arrays of nanoscopic dots, placed in cells of the square lattice. We show that the remanence magnetization $M_r$ decreases with the array size. For arrays 50x50, we investigate also the stability of the magnetic structure of an array in an oscillating magnetic field. The damage spreading technique reveals that this stability increases with the standard deviation $\sigma$ of the switching field of individual elements of the array. On the other hand, $M_r$ decreases with $\sigma$. An optimalization of the system (large $M_r$ and large stability) can then be reached at some intermediate value of $\sigma$.