Angular-dependence of magnetization switching for a multi-domain dot: experiment and simulation

TL;DR

This study investigates how the direction of an applied magnetic field affects magnetization switching in a multi-domain Fe/Mo(110) nanodot, combining experimental measurements with micromagnetic simulations to understand underlying bifurcations.

Contribution

It provides a detailed experimental and simulation analysis of angular dependence in magnetization switching, highlighting the role of shape-induced bifurcations in multi-domain dots.

Findings

Angular variation of nucleation and annihilation fields measured and simulated.

Discontinuities linked to bifurcations in magnetization states.

Shape and non-uniform magnetization interplay cause switching behavior.

Abstract

We have measured the in-plane angular variation of nucleation and annihilation fields of a multi-domain magnetic single dot with a microsquid. The dots are Fe/Mo(110) self-assembled in UHV, with sub-micron size and a hexagonal shape. The angular variations were quantitatively reproduced by micromagnetic simulations. Discontinuities in the variations are observed, and shown to result from bifurcations related to the interplay of the non-uniform magnetization state with the shape of the dot.