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7/17/2016 (Added to site)
Author(s): N Iacob, G Schinteie, C Bartha, P Palade, L Vekas and V Kuncser

Effects of magnetic dipolar interactions on the specific time constant in superparamagnetic nanoparticle systems

Journal: Journal of Physics D: Applied Physics
DOI: 10.1088/0022-3727/49/29/295001
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 A quantitative treatment of the effects of magnetic mutual interactions on the specific

absorption rate of a superparamagnetic system of iron oxide nanoparticles coated with
oleic acid is reported. The nanoparticle concentration of the considered ferrofluid samples varied from a very low (0.005) to a medium (0.16) value of the volume fraction, whereas the amplitude of the exciting AC magnetic field ranged from 14–35 kA m−1. It was proved that a direct effect of the interparticle interactions resides in the regime of the modified superparamagnetism, dealing, besides the usual increase in the anisotropy energy barrier per nanoparticle, with the decrease in the specific time constant 0 of the relaxation law, usually considered as a material constant. Consequently, the increase in the specific absorption rate versus the volume fraction is significantly diminished in the presence of the interparticle interactions compared to the case of non-interacting superparamagnetic nanoparticles, with direct influence on the magnetic hyperthermia efficiency.

Keywords: AC field    frequency    intensity    interactions    iron oxide    nanoparticles    SAR   

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