TY - JOUR
T1 - Magneto-optical harmonic susceptometry of superparamagnetic materials
AU - Vandendriessche, Stefaan
AU - Brullot, Ward
AU - Slavov, Dimitar
AU - Valev, Ventsislav K.
AU - Verbiest, Thierry
PY - 2013/4/22
Y1 - 2013/4/22
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84876959987&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1063/1.4801837
U2 - 10.1063/1.4801837
DO - 10.1063/1.4801837
M3 - Article
AN - SCOPUS:84876959987
SN - 0003-6951
VL - 102
JO - Applied Physics Letters
JF - Applied Physics Letters
IS - 16
M1 - 161903
ER -