Dy–Cu–Sn Triple-Doped Yttrium Iron Garnet: Enhanced Magnetism and Dielectrics for Microwave Devices
Kexin Chen, Ruyun Ding, Jia Gu, Shuai Chen, Wencheng Yang, Hui Zheng
Abstract
High Resolution Image Download MS PowerPoint Slide Yttrium iron garnet (YIG), a typical ferrimagnetic oxide with unique spin-wave properties, is widely used in microwave and optoelectronic applications due to its strong Faraday rotation, low optical loss, and high Curie temperature. In this work, Dy–Sn–Cu tridoped YIG ceramics with the composition Y 3– x Dy x Fe 4.8 Cu 0.1 Sn 0.1 O 12 ( x = 0.05–0.20) were synthesized via solid-state reaction. By regulating the Dy 3+ doping concentration, a synergistic optimization of the microstructure, crystal structure, magnetic, and dielectric properties was achieved. Results indicate that Dy ions preferentially substitute at the dodecahedral c-sites, leading to lattice expansion, grain growth, and densified microstructure. At x = 0.15, the material exhibits optimal soft magnetic performance with a saturation magnetization of 28.42 emu/g, a coercivity of 5.39 Oe, and a real permeability of 78.92 at 1 MHz. The enhancement is primarily attributed to strengthened superexchange interactions and reduced domain wall pinning. Dy doping increases magnetic anisotropy, resulting in a broadened ferromagnetic resonance line width from 69 to 195 Oe. At x = 0.20, the dielectric constant reaches 20.34, dielectric loss decreases to 0.13, and electrical resistivity rises to 3.34 × 10 9 Ω cm at 305 K. This study offers a viable strategy for developing high-performance, compact, and efficiently integrated microwave components.