Domain wall displacement in Py square ring for single nanometric magnetic bead detection

TL;DR

This paper introduces a novel method for detecting single nanometric magnetic particles by utilizing domain wall displacement in a ferromagnetic nanostructure, with modeling and experimental validation for potential biomolecular sensing applications.

Contribution

It presents a new detection approach based on domain wall displacement in ferromagnetic nanostructures, demonstrated through modeling and experiments with a Permalloy square ring.

Findings

Viability of domain wall displacement for magnetic particle detection

Successful modeling and experimental validation

Potential application in single molecule biosensing

Abstract

A new approach based on the domain wall displacement in confined ferromagnetic nanostructures for attracting and sensing a single nanometric magnetic particles is presented. We modeled and experimentally demonstrated the viability of the approach using an anisotropic magnetoresistance device made by a micron-size square ring of Permalloy designed for application in magnetic storage. This detection concept can be suitable to biomolecular recognition, and in particular to single molecule detection.