Abstract

Abstract The OMP particle and four additional iron oxide samples were investigated in terms of zero field cooled magnetization (ZFCM) curves and hysteresis loops. The observation of superparamagnetic blocking and the absence of magnetic remanence demonstrated that the samples are superparamagnetic at room temperature. The magnitude of the ZFCM peak temperatures are in qualitative agreement with the iron oxide crystal size. One sample deviated from the remaining four in that it had a significantly lower magnetic moment and an irregular ZFCM curve showing the presence of various less magnetic phases. The similar results obtained with the OMP particles and the individual OMP crystallites without the polymer support show that the superparamagnetic properties of the individual OMP crystallites are retained on the OMP particle. Depending on the application, the ZFCM experiment may be viewed as an alternative or a supplement to Mössbauer spectroscopy in studies of the superaparamagnetic blocking of iron oxides.

Keywords

SuperparamagnetismRemanenceCrystalliteMaterials scienceMagnetizationNuclear magnetic resonanceMagnetic momentIron oxideHysteresisParticle sizeMagnetic hysteresisCharacterization (materials science)Particle (ecology)Condensed matter physicsAnalytical Chemistry (journal)ChemistryMagnetic fieldNanotechnologyPhysical chemistryPhysicsMetallurgyGeology

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Publication Info

Year
1994
Type
article
Volume
31
Issue
3
Pages
268-272
Citations
67
Access
Closed

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Carl E. Sjøgren, Karen Briley‐Sæbø, M. M. Hanson et al. (1994). Magnetic characterization of iron oxides for magnetic resonance imaging. Magnetic Resonance in Medicine , 31 (3) , 268-272. https://doi.org/10.1002/mrm.1910310305

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DOI
10.1002/mrm.1910310305