Interactions between goethite particles subjected to heat treatment

Daniel Esmarch Madsen, Mikkel Fougt Hansen, C.B. Koch, Steen Mørup

Research output: Contribution to journalJournal articleResearchpeer-review


We have studied the effect of heating on the magnetic properties of particles of nanocrystalline goethite by use of Mossbauer spectroscopy. Heating at 150 degrees C for 24 h leads to a change in the quadrupole shift in the low-temperature spectra, indicating a rotation of the sublattice magnetization directions. Fitting of quantiles, derived from the asymmetrically broadened spectra between 80 and 300 K, to the superferromagnetism model indicates that this change is due to a stronger magnetic coupling between the particles.
Original languageEnglish
JournalJournal of Physics: Condensed Matter
Issue number13
Pages (from-to)135215
Publication statusPublished - 2008


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