DYNAMIC EFFECTS OF DIPOLAR INTERACTIONS ON THE SPECIFIC LOSS POWER OF Mn0.7Zn0.3Fe2O4

Pham Hong Nam

Abstract


In this work, isothermal magnetization and initial dc susceptibility of spheroidal, nearly monodisperse Mn0.7Zn0.3Fe2O4 nanoparticles (typical diameter: 20 nm) prepared by a hydrothermal route have been measured between 10 and 300 K. The high-temperature inverse magnetic susceptibility was always found to follow a linearly temperature dependence. The deviation from the standard superparamagnetic behavior is related to dipolar interaction among nanoparticles. The results are well explained using interacting superparamagnetic model, which is basically a mean field theory. As a consequence, the dipolar interaction affected the specific loss power of Mn0.7Zn0.3Fe2O4



Keywords


magnetic nanoparticles, interacting superparamagnetic model, spinel.

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DOI: https://doi.org/10.15625/2525-2518/56/1A/12503

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Published by Vietnam Academy of Science and Technology