期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 452, 期 -, 页码 48-54出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2017.12.013
关键词
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资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2015R1A2A1A10056286]
- National Research Foundation of Korea [NRF-2017R1A2B2012241]
We fabricated Gd-doped Y3Fe5O12 (YIG) nanoparticles by a modified sol-gel method. We investigated the effects of isovalent Gd3+-ion substitution on the structural and magnetic properties of Y3-xGdxFe5O12 (0 <= x <= 3) nanoparticles. Isovalent Gd3+-ion substitution for Y3+ leads to lattice expansion and change in the Fe(a)-O-Fe(d) bond angle. The X-ray photoemission spectroscopy and Mossbauer measurements revealed a high-spin state of Fe3+. The Mossbauer analysis showed an increase in the Fe(d)(3+)/Fe(a)(3+) ratio, indicating a relocation of Y3+ ions at the dodecahedral sites and Fe3+ ions at the octahedral sites. The magnetic properties could be explained in terms of magnetic-structural evolution with increasing Gd3+ content. The field dependence of magnetization indicated a clear decrease of the magnetization while the magnetic anisotropy first decreases and then increases with the increase of Gd3+ content. These Gd3+-ionsubstituted nanocrystalline garnet ferrites are suitable for use in a variety of magneto-optical applications. (C) 2017 Elsevier B.V. All rights reserved.
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