Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 311, Issue 1, Pages 145-149Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2006.11.169
Keywords
complex magnetic susceptibility; Brownian relaxation; magnetic dipole moment; microsphere; magnetic nanoparticle; colloidal dispersion; cobalt ferrite; silica; latex; magnetic susceptibility
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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. (C) 2006 Elsevier B.V. All rights reserved.
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