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Structural And Size Dependent Magnetic Properties Of Single Phase Nanostructured Gadolinium-Iron-Garnet Under High Magnetic Field Of 32 Tesla, C. N. Chinnasamy, J. M. Greneche, M. Guillot, B. Latha, T. Sakai, C. Vittoria, V. G. Harris

Vincent G. Harris

Here we report the single phase nanostructured Gd₃Fe₅O₁₂ garnets with different grain sizes (bulk, 75, 47, 35, and 22 nm) were prepared by ball milling for various milling times. Both the average grain size and the lattice parameter were estimated from the x-ray diffraction line broadening. The 57Fe Mӧssbauer spectra were recorded at 300 and 77 K for the samples with different grain sizes clearly evidenced the formation of Fe²⁺ ions induced by milling and the content of Fe²⁺ increases with milling time. At 4.2 K, a significant increase in saturation magnetization (+11%) has been observed for the 47 nm …