Abstract

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 particles. The magnetization is strongly applied field dependent and no saturation effect is observed even at fields as high as of 320 kOe. The results presented here have been explained in terms of the key role played by the Fe²⁺ ions.

Notes

Originally published in Journal of Applied Physics 107, 09A512 (2010). DOI:10.1063/1.3357326 (http://dx.doi.org/10.1063/1.3357326).

Keywords

nanostructures, milling, single phase nanostructured gadolinium iron garnet, 32 tesla, Gd₃Fe₅O₁₂, saturation magnetization

Subject Categories

Magnetic properties, Pulsed laser deposition, Magnetic fields, Garnet, Grain--Milling

Disciplines

Electromagnetics and photonics

Publisher

American Institute of Physics

Publication Date

5-1-2010

Rights Information

Copyright 2010 American Institute of Physics.

Rights Holder

American Institute of Physics


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