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.
Original language | English (US) |
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Pages (from-to) | 145-149 |
Number of pages | 5 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 311 |
Issue number | 1 SPEC. ISS. |
DOIs | |
State | Published - Apr 2007 |
Keywords
- Brownian relaxation
- Cobalt ferrite
- Colloidal dispersion
- Complex magnetic susceptibility
- Latex
- Magnetic dipole moment
- Magnetic nanoparticle
- Magnetic susceptibility
- Microsphere
- Silica
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics