Geometric signature of reversal modes in ferromagnetic nanowires

TL;DR

This paper introduces a geometric method to analyze magnetization reversal modes in ferromagnetic nanowires, revealing how different reversal processes influence the shape of a parametric curve based on anisotropy, demagnetization, and exchange effects.

Contribution

It presents a novel geometric approach to identify and distinguish magnetization reversal modes in nanowires, linking the modes to specific geometric signatures in the parametric curve.

Findings

Reversal modes produce distinct geometric signatures.

Anisotropy type influences the shape of the critical switching field curve.

Experimental nanowires confirm the theoretical geometric signatures.

Abstract

Magnetic nanowires are a good platform to study fundamental processes in Magnetism and have many attractive applications in recording such as perpendicular storage and in spintronics such as non-volatile magnetic memory devices (MRAM) and magnetic logic devices. In this work, nanowires are used to study magnetization reversal processes through a novel geometric approach. Reversal modes imprint a definite signature on a parametric curve representing the locus of the critical switching field. We show how the different modes affect the geometry of this curve depending on the nature of the anisotropy (uniaxial or cubic anisotropy), demagnetization and exchange effects. The samples we use are electrochemically grown Nickel and Cobalt nanowires.