Saturation magnetization as a function of temperature in Zn doped YIG nanoparticles

The behavior of saturation magnetization as a function of temperature (M-S(T)), in Zinc doped YIG nanoparticles was investigated. The samples, with crystallite size between 40 nm and 78 nm were synthesized by the sol-gel method. With the data obtained through the vibrating sample magnetometry, an adjustment with the Approach law to obtain the saturation magnetization at temperatures between 50 K and 300 K was performed. With the data it was possible to get the M-S x T experimental plots. Curves were fitted with the most recent proposal by Cojocaru et al., where an expression for M(T) is derived using a three-dimensional generalization of Heisenberg's Hamiltonian, that take into account geometry, size and boundary conditions of magnetic nanoparticles. A good correspondence was obtained between the experimental data and the adjustment through the proposal. Analyzing the parameters obtained through the fitting, it was possible to visualize a weakening in the ferrimagnetic coupling with increased doping of Zn. It was also possible to see a good adjustment of the proposal with the change in the nanoparticles shape. The proposal proved to be very useful for the study of the nanoparticles.

Automated summary

The behavior of saturation magnetization as a function of temperature in Zinc doped YIG nanoparticles was investigated. It was found that the ferrimagnetic coupling weakened with increased doping of Zn. The proposal used in the study was able to adjust well to the change in nanoparticles shape.