Tailoring the magnetic properties of Fe asymmetric nanodots

TL;DR

This paper investigates how the shape asymmetry of Fe nanodots influences their magnetic properties, revealing complex reversal modes and non-monotonic behavior of coercivity and remanence through micromagnetic simulations.

Contribution

It provides a detailed analysis of the impact of geometric asymmetry on magnetic reversal mechanisms in nanodots using 3D micromagnetic modeling.

Findings

Asymmetric nanodots reverse magnetization via vortex nucleation and propagation.

Shape asymmetry affects coercivity and remanence depending on the external field angle.

Complex reversal modes lead to non-monotonic magnetic property behavior.

Abstract

Asymmetric dots as a function of their geometry have been investigated using three-dimensional (3D) object oriented micromagnetic framework (OOMMF) code. The effect of shape asymmetry of the disk on coercivity and remanence is studied. Angular dependence of the remanence and coercivity is also addressed. Asymmetric dots are found to reverse their magnetization by nucleation and propagation of a vortex, when the field is applied parallel to the direction of asymmetry. However, complex reversal modes appear when the angle at which the external field is applied is varied, leading to a non monotonic behavior of the coercivity and remanence.