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

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

Study on synthesis and characterization of nano scale spinel Mn_0.5­Fe_2.5O₄ by micro-emulsion method

“…There are many proven methods to synthesize ferrite magnetic nanoparticles. Typically there are methods: co-precipitation, [6][7][8][13][14][15] micro-emulsion, [18][19][20][21] thermal decomposition, [22] hydrothermal method, [23] sol-gel, [9,24] etc. Each synthetic method has advantages and disadvantages that will be suitable for specific research and application purposes.…”