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Magnetic nanoparticles absorb energy from external alternating magnetic field to create a nanosized heating source. Specific loss power (SLP) is affected strongly by several magnetic parameters of material and viscosity of nanofluid. In this study, the specific loss power as dependent on saturation magnetization was calculated for hard ferrite CoFe2O4 (K = 290 kJ/m 3 ) and soft ferrite MnFe2O4 (K = 3 kJ/m 3 ) with two values of viscosity in biological range 1-2 mPas. Besides, we investigated the experimental dependence SLP on their saturation magnetization while changing viscosity using agar powder. A large change of slope s SLP M was found for CFO when the viscosity changes; whereas it remained almost unaffected by the variation of viscosity fluid of MFO. All calculation and experimental results are discussed via the competition between Néel and Brown relaxation.

INFLUENCE OF SATURATION MAGNETIZATION AND VISCOSITY ON SPECIFIC LOSS POWER FOR CoFe2O4 AND MnFe2O4 MAGNETIC NANOPARTICLES