Study on the Structure, Magnetic Properties and Mechanism of Zn-Doped Yttrium Iron Garnet Nanomaterial Prepared by the Sol-gel Method

Gels

Zhenhai Li¹  Haiyan Li²  Shouqiang Li³  Yuheng Guo³  Leilei Chen⁴ 

[1] China’s People’s Liberation Army 32319 Troops, Urumqi 830001, China;Department of Mathematics, Sichuan University, Chengdu 610065, China;School of Electronic Engineering, Chengdu Technological University, Chengdu 611730, China;Urumqi Municipal Center for Disease Control and Prevention, Urumqi 830018, China;

关键词: nanoparticles;    sol-gel method;    saturation magnetization;    vibration modes;    TG-DSC;   

DOI  :  10.3390/gels8050325

来源: DOAJ

【 摘 要 】

To explore the effect and mechanism of bivalent ion doping on yttrium iron garnet (YIG), Zn-YIG (Zn-doped YIG) nanoparticles with a size of 60~70 nm were prepared by the sol-gel method. It was proven that Zn ion doping resulted in lattice expansion and internal stress due to crystallite size shrinkage. A Raman spectroscopic analysis proved the influence of Zn doping on the crystal structure and peak intensity by analyzing Raman vibration modes. The characteristics and chemical mechanism of mass loss and phase evolution in each temperature region were explored through TG-DSC measurements. Moreover, it was revealed that the antiferromagnetic coupling, pinning mechanisms and particle aggregation lead to coercivity, exhibiting different variation trends. A saturation magnetization (Ms) curve variation mechanism was further revealed, which was due to the thermal effects, super-exchange effect, and coupling effect between sub-lattices. Meanwhile, the influence of the thermal effect on Ms and its mechanism were explored by spin theory, and it was proven that it was mainly caused by the random arrangement of magnetic moments and thermal vibration. These results provide theoretical support for the wider application of YIG devices in microwave and high-temperature fields.

【 授权许可】

Unknown