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Magnetic Properties of R-YIG (R = La, Nd, and Gd) Derived by a Sol-gel Method
Journal of Magnetics, Volume 21, Number 3, 30 Sep 2016, Pages 303-307
Abstract
Y3-xRxFe5O12 (R = La, Nd, and Gd) powder were fabricated using a sol-gel pyrolysis method. Their magnetic properties and crystalline structures were investigated using x-ray diffraction (XRD), a vibrating sample magnetometer (VSM), and Mössbauer Spectrometer. The Mössbauer spectra for the powders were taken at various temperatures ranging from 12 K to Curie temperature (Tc). The isomer shifts indicated that the valence states of Fe ions for the 16(a) and 24(d) sites have a ferric character. The saturation magnetization (Ms) increases from 32 to 34 (emu/g) for the YIG, and Nd-YIG, respectively. However, Ms decreases to 27 (emu/g) at Gd-YIG.
Keywords: sol-gel method; Mössbauer spectroscopy; R-YIG (R = La, Nd, and Gd); garnet structure
DOI: http://dx.doi.org/10.4283/JMAG.2016.21.3.303
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