Modeling the interactions between magnetic particles
2013 (English)Report (Other academic)
The aim of the work presented here is to describe the appearance of force curves from atomic force microscopy measurements between two interacting magnetic particles. A model treating particles as points is first presented. This model is found to accurately describe interactions involving spherical particles, but is not equally successful in describing interactions between particles of cylindrical and conical geometries at short surface separations. Effects from particle geometries are introduced in the dimensional model through dimensional analysis. A characteristic length describing the vertical extent of the particles is defined. An example calculation of the characteristic length for a spherical particle of known radius is presented. The same computational method is then applied to several experimental force curves from atomic force microscopy measurements. The calculated characteristic lengths are of comparable size to the known vertical extent of the particles. Reconstruction of the experimental force curves using the calculated characteristic lengths in the dimensional model gives good agreement between theory and experiment.
Place, publisher, year, edition, pages
2013. , 25 p.
Magnetic dipole, Magnetic interaction, Microsized particles, Magnetite, Atomic force microscopy, Natural sciences - Physics
Naturvetenskap - Fysik
Research subject Tillämpad fysik
IdentifiersURN: urn:nbn:se:ltu:diva-22908Local ID: 4c6a7509-7c59-42a7-b9f3-f3c41711fe8fOAI: oai:DiVA.org:ltu-22908DiVA: diva2:995957
Godkänd; 2013; 20140505 (danhed)2016-09-292016-09-29Bibliographically approved