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Magnetic Properties Of MnFe2O4 Nano-aggregates Dispersed In Paraffin Wax

B. Aslibeiki, P. Kameli
Published 2015 · Materials Science

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Abstract Manganese ferrite, MnFe 2 O 4 nanoparticles with average size of ∼6.5 nm were synthesized by using a thermal decomposition method. The nanoparticles were aggregated which was confirmed by FESEM and TEM images. The aggregates with a diameter of ∼50 nm showed interacting superspin glass (SSG) behavior. The powders were dispersed in the molten paraffin wax by using ultrasonic bath. Samples with different paraffin/ferrite weight ratios of P / F = 0, 1, 5, 10 and 20 were prepared. M – H curves of the samples revealed presence of superparamagnetic state at 300 K. Saturation magnetization ( M s ) decreased from 26.6 to 1.3 emu/g by increasing the P / F value from 0 to 20, respectively. Furthermore, the VSM measurements showed a decrease in surface spin disorder of paraffin-embedded nanoparticles in comparison with bare particles. The AC magnetic susceptibility peak temperature, T P increased from 230 to >300 K with increasing the paraffin content in the samples. The present study showed that by dispersing the particles in a non-magnetic matrix, the blocking temperature could be increased.
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