Abstract
Biocompatible superparamagnetic iron oxide nanoparticles of magnetite coated withdextran were magnetically characterized using the techniques of SQUID (superconductingquantum interference device) magnetometry and ferromagnetic resonance (FMR).The SQUID magnetometry characterization was performed by isothermal measurementsunder applied magnetic field using the methods of zero-field-cooling (ZFC) andfield-cooling (FC). The magnetic behavior of the nanoparticles indicated theirsuperparamagnetic nature and it was assumed that they consisted exclusively ofmonodomains. The transition to a blocked state was observed at the temperatureTB = (43 ± 1) K for frozenferrofluid and at (52 ± 1) K for the lyophilized ferrofluid samples. The FMR analysis showed that the derivative peak-to-peak linewidth(ΔHPP), gyromagneticfactor (g), number ofspins (NS), and spin–spinrelaxation time (T2) were strongly dependent on both temperature and super-exchange interaction. Thisinformation is important for possible nanotechnological applications, mainly those whichare strongly dependent on the magnetic parameters.
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