Low-frequency complex magnetic susceptibility of magnetic composite microspheres in colloidal dispersion

Ben H. Erné, Maria Claesson, Stefano Sacanna, Mark Klokkenburg, Emile Bakelaar, Bonny W.M. Kuipers

Research output: Contribution to journalArticlepeer-review

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 languageEnglish (US)
Pages (from-to)145-149
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume311
Issue number1 SPEC. ISS.
DOIs
StatePublished - 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

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