Magnetic and structural characteristic of Gd-YIG. (1st August 2022)

• Record Type: Journal Article
• Authors: Kheirdoust, Hajar; Niyaifar, Mohammad; Hasanpour, Ahmad; Pormehr, Asma; Mohammadpour, Hory; Saeidi, Parviz; Niyaifar, Shahrokh
• Is Part Of: Solid state communications. Volume 351(2022)
• Publication Date: 2022-08-01
• Subjects: Gd-YIG -- Sol-gel -- Magnetic properties -- FT-IR -- Curie temperature; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2022.114793
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: The substitution's effect of the of Y 3+ by Gd 3+ on the structural and magnetic properties of gadolinium-doped yttrium iron garnet, Gdx Y3-x Fe5 O12, with 0.0 ≤ x ≤ 1.3 has been presented. The crystalline structures and magnetic properties were investigated using X-ray Diffraction (XRD), Transmission electron microscope (TEM), Transform Infrared Spectroscopy (FT-IR), Vibrating Sample Magnetometer (VSM). Furthermore, Curie temperature (Tc) helped us to explain the magnetic behavior of the samples by determining the strength of super-exchange interaction. The XRD patterns of Gdx Y3-x Fe5 O12 indicated the pure garnet structure without any extra phase and the sizes of particles were in the range 33–42 nm. The powder morphology was analyzed by transmission electron microscopy (TEM), evidencing agglomerated particles with regular shapes. FT-IR spectra confirmed the garnet phase formation and there is a shift for lower wave numbers as the Gd 3+ concentration increases. It was found that the a-d super-exchange interactions play an important role in the saturation magnetization of the sample. In addition, the variation of Gd 3+ content affects the Curie temperature (Tc) by determining the strength of super-exchange interaction. Highlights: XRD pattern reveals that Gd 3+ ions occupy the dodecahedral sites and increase the lattice constant. The Gdx Y3-x Fe5 O12, solids were composed of nano-sized (21–50 nm) spherical agglomerated particles.\ Substituting Gd3+ ions instead of Y3+ ions affects the Tc by changing in exchange interaction between the magnetic moments