Exploring the magnetic properties of individual barcode nanowires using wide-field diamond microscopy

TL;DR

This study demonstrates a novel wide-field diamond microscopy technique to analyze the magnetic properties of individual barcode nanowires at room temperature, providing detailed insights into their magnetic behavior.

Contribution

It introduces a new method for characterizing magnetic nanowires at the single-wire level using quantum microscopy, bridging experimental data with micromagnetic simulations.

Findings

Successfully measured saturation magnetization and coercivity of individual nanowires.

Validated experimental results with micromagnetic simulations.

Established a versatile approach for magnetic characterization of nanostructures.

Abstract

Barcode magnetic nanowires typically comprise a multilayer magnetic structure in a single body with more than one segment type. Interestingly, owing to selective functionalization and novel interactions between the layers, barcode magnetic nanowires have attracted significant attention, particularly in the field of bioengineering. However, an analysis of their magnetic properties at the individual nanowire level remains challenging. With this background, herein, we investigated the characterization of magnetic nanowires at room temperature under ambient conditions based on magnetic images obtained via wide-field quantum microscopy with nitrogen-vacancy centers in diamond. Consequently, we could extract critical magnetic properties, such as the saturation magnetization and coercivity, of single nanowires by comparing the experimental results with those of micromagnetic simulations. This study opens up the possibility for a versatile characterization method suited to individual magnetic nanowires.