Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1804170 | Journal of Magnetism and Magnetic Materials | 2007 | 5 Pages |
Abstract
A procedure is presented to determine the permanent magnetic dipole moment of composite microspheres containing magnetic nanoparticles with a blocked magnetic dipole moment. The composite particles are dispersed in a solvent, and the complex magnetic susceptibility is measured from 0.1 to 1000 Hz using a highly sensitive new setup. Composite particles with a permanent magnetic dipole moment are revealed by a characteristic frequency that corresponds to the Brownian rotation of the microspheres. From measured susceptibility spectra, we calculate the permanent magnetic dipole moment of recently developed cobalt ferrite-doped silica and latex microspheres.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Ben H. Erné, Maria Claesson, Stefano Sacanna, Mark Klokkenburg, Emile Bakelaar, Bonny W.M. Kuipers,