Journal of Magnetics

The Korean Magnetics Society (한국자기학회)
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Magnetic Properties of R-YIG (R = La, Nd, and Gd) Derived by a Sol-gel Method

  • Uhm, Young Rang (Radioisotope Research Division, Korea Atomic Energy Research institute (KAERI)) ;
  • Lim, Jae Cheong (Radioisotope Research Division, Korea Atomic Energy Research institute (KAERI)) ;
  • Choi, Sang Mu (Radioisotope Research Division, Korea Atomic Energy Research institute (KAERI)) ;
  • Kim, Chul Sung (Department of nano-electro physics, Kookmin University)
  • Received : 2016.06.13
  • Accepted : 2016.07.19
  • Published : 2016.09.30
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Abstract

$Y_{3-x}R_xFe_5O_{12}$ (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 $M{\ddot{o}}ssbauer$ Spectrometer. The $M{\ddot{o}}ssbauer$ 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.

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