Phase Diagram of Magnetization Reversal Processes in Nanorings

TL;DR

This paper explores the magnetization reversal processes in magnetic nanorings, revealing how their switching mechanisms depend on geometric dimensions and exchange length, and identifying three new mechanisms for potential data storage applications.

Contribution

The study introduces a comprehensive phase diagram of magnetization reversal in nanorings and uncovers three novel switching mechanisms influenced by geometry and magnetic interactions.

Findings

Switching mechanisms depend on ring dimensions and exchange length.

Three new magnetization reversal mechanisms identified.

Potential applications in high-density magnetic storage.

Abstract

We investigate magnetization reversal processes of magnetic nanorings. Using a recently developed efficient cartesian coordinates fast multipole method, magnetization switching phase diagrams are constructed for such structures. We find that the dominant switching mechanisms strongly depend on the relative spatial dimensions of the rings, i.e. height, width and radius. Furthermore, they are found to depend on a characteristic exchange length scale, which is determined by the competing short-range ferromagnetic and long-range dipolar interactions in these systems. Detailed simulations allow us to identify three novel switching mechanisms, which should be useful for building high density storage systems.