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Abstract
Magnetic nanoparticles absorb energy from external alternating magnetic field to create ananosized heating source. Specific loss power (SLP) is affected strongly by several magneticparameters of material and viscosity of nanofluid. In this study, the specific loss power asdependent on saturation magnetization was calculated for hard ferrite CoFe2O4 (K = 290 kJ/m3)and soft ferrite MnFe2O4 (K = 3 kJ/m3) with two values of viscosity in biological range 1-2 mPas.Besides, we investigated the experimental dependence SLP on their saturation magnetizationwhile changing viscosity using agar powder. A large change of slopesSLPMwas found for CFOwhen the viscosity changes; whereas it remained almost unaffected by the variation of viscosityfluid of MFO. All calculation and experimental results are discussed via the competitionbetween Néel and Brown relaxation.
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