Quantitative measurement of the magnetic moment of an individual magnetic nanoparticle by magnetic force microscopy

TL;DR

This paper presents a method for quantitatively measuring the magnetic moment of individual nanoparticles using magnetic force microscopy, with calibration techniques enabling high-resolution and broad applicability.

Contribution

The study introduces a calibration scheme for MFM that allows precise quantification of magnetic moments of single nanoparticles under ambient conditions.

Findings

Achieved magnetic moment resolution of ~10^(-18) Am^2

Calibration method applicable to various MFM setups

Potential applications in nanomagnetism and biotechnology

Abstract

We demonstrate the quantitative measurement of the magnetization of individual magnetic nanoparticles (MNP) using a magnetic force microscope (MFM). The quantitative measurement is realized by calibration of the MFM signal using an MNP reference sample with traceably determined magnetization. A resolution of the magnetic moment of the order of 10^(-18) Am^2 under ambient conditions is demonstrated which is presently limited by the tip's magnetic moment and the noise level of the instrument. The calibration scheme can be applied to practically any MFM and tip thus allowing a wide range of future applications e.g. in nanomagnetism and biotechnology.