Quantitative magnetic force microscopy on permalloy dots using an iron filled carbon nanotube probe

2010/11/01 by Franziska Wolny, Yuri N. Obukhov, Wolny, F. +29 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Force Microscopy Techniques and Applications #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Mechanical and Optical Resonators #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)

paper · pdf · doi:10.48550/arxiv.1011.0389

openalex publication_date 2010/11/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We have characterized a new Magnetic Force Microscopy (MFM) probe based on an iron filled carbon nanotube (FeCNT) using MFM imaging on permalloy (Py) disks saturated in a high magnetic field perpendicular to the disk plane. The experimental data are accurately modeled by describing the FeCNT probe as having a single magnetic monopole at its tip whose effective magnetic charge is determined by the diameter of the iron wire enclosed in the carbon nanotube and its saturation magnetization 4 πM_s ~ 2.2 x 10⁴ G. A magnetic monopole probe enables quantitative measurements of the magnetic field gradient close to the sample surface. The lateral resolution is defined by the diameter of the iron wire ~15 nm and the probe-sample separation. As a demonstration, the magnetic field gradients close to the surface of a Py dot in domain and vortex states were imaged.

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