A study was undertaken about the structural, morphological and magnetic
properties at room temperature of crystalline aluminium substituted yttrium
iron garnet, YIG (Y3Fe5-xAlxO12 with 1.5< x < 1.7) nanoparticles prepared by
polymeric precursormethod at the temperature of 700?C for 2 hours. The
single-phase character and the well-defined structure of YIG nanoparticles
were confirmed by X-ray diffraction, excluding the presence of any other
phases. The Raman spectra showed that the changes of lattice vibration would
influence interaction between the Fe ion and the host. Mean crystallite size
of the single-phase powder was about 46-65 nm. Particles? morphology was
investigated by high-resolution transmission electron microscopy, which shows
that the particles were agglomerated. From hysteresis loops, particles?
efficiency range from 91.4% to 95.9% as Fe/Al ratio decreases. Saturation
magnetization was affected by the particle size and Fe/Al stoichiometric
ratio. We observe that the saturation magnetization increases as the Fe/Al
ratio is raised due to enhancement of the surface spin effects.
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