Determination of energy barrier distributions of magnetic nanoparticles by temperature dependent magnetorelaxometry

We present a new method for the characterization of magnetic nanoparticles based on the analysis of the dependence of the Néel relaxation signal on the sample temperature. In contrast to the established characterization methods, the new method directly delivers the energy barrier distribution of the...

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Bibliographic Details
Published in:Nanotechnology 2003-12, Vol.14 (12), p.1251-1254
Main Authors: Romanus, E, Berkov, D V, Prass, S, Groß, C, Weitschies, W, Weber, P
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Fine-particle systems
Magnetic properties and materials
Physics
Small particles and nanoscale materials
Studies of specific magnetic materials
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Summary:We present a new method for the characterization of magnetic nanoparticles based on the analysis of the dependence of the Néel relaxation signal on the sample temperature. In contrast to the established characterization methods, the new method directly delivers the energy barrier distribution of the magnetic system (in the case of ferrofluid particles or their aggregates). A water based ferrofluid consisting of magnetic nanoparticles with an iron oxide core and a shell of carboxydextran has been magnetically fractionated and immobilized and the fractions have been investigated in a temperature range from 77 to 350 K. The influence of the fractionation process on the distribution of the energy barriers of the particle system has been studied qualitatively.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/14/12/003