Influential incorporation of RE metal ion (Dy3+) in yttrium iron garnet (YIG) nanoparticles: Magnetic, electrical and dielectric behaviour

Dy3+ incorporated yttrium iron garnet (Y3-xDyxFe5O12) nanoparticles were fabricated via self-combustion assisted solution gelation route. The mono-phase formation and nanocrystalline nature of the fabricated samples were confirmed through X-ray employed diffraction studies. It demonstrates mono phasic garnet-cubic-spinel lattice formation along with an average particle size varying between 6 and 9 nm. The lattice constant determined via XRD analysis is found within the scope of 12.356 angstrom to 12.424 angstrom. The morphological aspects were visualized by the SEM analysis which uncovered the spherical shaped nature of grains with the size in nanometer range. The compositional verification was undertaken with the help of EDAX analysis which ensured the presence of elements in desired proportions. The magnetic parameters were diminished with Dy3+ content x while the magneton number n(B) increased with increasing Dy3+ content x. The electrical properties were measured using 'two probe technique' with varying temperature. The electrical resistivity diminishes with increment in temperature demonstrating semiconducting conduct. Values of various dielectric parameters show strong frequency dependence. With the increase in frequency, the dielectric parameters get decreases within the scope of 10 4 Hz-10 6 Hz. The magnetic, electrical and dielectric conduct of these prepared nanoparticles show its relevance in high frequency device development applications.