Characterisation of Dynabeads (R) by magnetization measurements and Mossbauer spectroscopy

G. Fonnum, C. Johansson, A. Molteberg, Steen Mørup, E. Aksnes

Research output: Contribution to journalJournal articleResearchpeer-review


X-ray diffraction, SEM analysis, Mossbauer spectroscopy and magnetic measurements were used to characterize three different magnetic beads (Dynabeads((R))). Maghemite (gamma-Fe2O3) is the predominant crystalline phase. The nanoparticles were evenly spread in the beads, and the crystal sizes were in the range of 8 nm. The nanoparticles showed superparamagnetic behaviour. The particle's intrinsic magnetization of about 340 kA/m is typical for nanoparticles of maghemite.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Issue number1
Pages (from-to)41-47
Publication statusPublished - 2005


  • dynabeads
  • x-ray diffraction
  • SEM analysis
  • magnetic mobility
  • magnetic measurements
  • Mossbauer spectroscopy
  • crystallite size
  • nanoparticles
  • maghemite


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