Journal
APPLIED PHYSICS LETTERS
Volume 102, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4801837
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Funding
- FWO-Vlaanderen
- University of Leuven (GOA)
- University of Leuven (Research fund)
- Agency for Innovation by Science and Technology (IWT) Flanders
- EPSRC from the BAS [EP/G060649/1, VS.040.10N]
- EPSRC from the FWO [EP/G060649/1, VS.040.10N]
- Engineering and Physical Sciences Research Council [EP/G060649/1] Funding Source: researchfish
- EPSRC [EP/G060649/1] Funding Source: UKRI
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We describe a technique to optically characterize superparamagnetism. Faraday rotation measurements are performed on a superparamagnetic nanocomposite using small alternating current magnetic fields. The superparamagnetism of the iron oxide nanoparticles causes signals at the uneven harmonics of the magnetic field frequency. These signals provide information on the magnetic moment of the superparamagnetic nanoparticles. Dia- and paramagnetism do not cause signals at higher harmonics, resulting in a high sensitivity to superparamagnetism, even in samples with large dia- or paramagnetic contributions. This technique provides a rapid, economical method to characterize superparamagnetism in composite samples not easily accessible by other techniques. (C) 2013 AIP Publishing LLC [http://dx.doi.org/10.1063/1.4801837]
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