Abstract
The effect of mechanical milling induced strain and particle size reduction on structural, micro-structural and magnetic properties of un-milled and milled polycrystalline samples of yttrium iron garnet, Y3Fe5O12 (YIG), for different duration, 3, 6, 9 and 12 h, have been studied using X-ray powder diffractometry, scanning electron microscopy, infrared spectroscopy, Mossbauer spectroscopy, high field magnetization and low field (0.5 Oe) ac susceptibility measurements. YIG on milling is found to decompose into Y3Fe5O12 and yttrium ortho-ferrite, YFeO3, phases, as reflected from various characterizations. The infrared and Mossbauer spectroscopic studies give an indication for the loss of oxygen on milling. The shift in Neel temperature with particle size reduction has been described by finite size scaling. The observed changes in M–H loop are mainly due to strain induced increase in surface anisotropy on milling. The two transitions have been observed in the thermal variation of ac susceptibility curves, corresponding to ferrimagnetic YIG-phase and another due to weak ferromagnetic YFeO3-phase.
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