中国物理B ›› 2025, Vol. 34 ›› Issue (10): 107202-107202.doi: 10.1088/1674-1056/addce4

所属专题： SPECIAL TOPIC — Advanced magnonics

• • 上一篇    下一篇

Spin-wave propagation in a bilayer of van derWaals magnet and ferrimagnetic insulator

Tengfei Xie(谢腾飞)1 and Huajun Qin(秦华军)1,2,†   

  1. 1 School of Physics and Technology, Wuhan University, Wuhan 430072, China;
    2 Wuhan Institute of Quantum Technology, Wuhan 430206, China
  • 收稿日期:2025-03-24 修回日期:2025-05-14 接受日期:2025-05-27 发布日期:2025-09-29
  • 通讯作者: Huajun Qin E-mail:qinhuajun@whu.edu.cn
  • 基金资助:
    This work was supported by the National Key Research and Development Program of China (Grant No. 2022YFA1402400) and the National Natural Science Foundation of China (Grant No. 12374119).

Spin-wave propagation in a bilayer of van derWaals magnet and ferrimagnetic insulator

Tengfei Xie(谢腾飞)1 and Huajun Qin(秦华军)1,2,†   

  1. 1 School of Physics and Technology, Wuhan University, Wuhan 430072, China;
    2 Wuhan Institute of Quantum Technology, Wuhan 430206, China
  • Received:2025-03-24 Revised:2025-05-14 Accepted:2025-05-27 Published:2025-09-29
  • Contact: Huajun Qin E-mail:qinhuajun@whu.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (Grant No. 2022YFA1402400) and the National Natural Science Foundation of China (Grant No. 12374119).

RichHTML

0

PDF (PC)

35

赞

摘要： Spin waves in van der Waals magnets hold promise for magnonic devices and circuits down to the two-dimensional limit. However, their short decay lengths pose challenges for practical applications. Here, we report on a material platform consisting of a van der Waals magnet, Fe$_5$GeTe$_2$ (FGT), and a ferrimagnetic insulator of yttrium iron garnet, Y$_3$Fe$_5$O$_{12}$ (YIG), which supports the low-loss propagation of spin waves. Using broadband spin-wave spectroscopy, we observed an increase in spin-wave group velocity with decreasing temperature, which peaks at 30 K in the YIG and FGT/YIG films. This effect is ascribed to a change in the saturation magnetization of YIG and FGT/YIG at low temperature, resulting in a change in the spin-wave dispersion relations. Using micromagnetic simulations, we further investigated spin-wave propagation in an FGT/YIG bilayer and revealed a longer spin-wave decay length in the bilayer than in a single FGT layer, which is due to the lower effective damping in the bilayer. Moreover, asymmetric spin-wave dispersion, induced by a chiral dipolar interaction between the YIG and FGT layers, enables nonreciprocal control of spin-wave propagation.

关键词: magnonics, spin waves, van der Waals magnets, yttrium iron garnet thin films

Abstract: Spin waves in van der Waals magnets hold promise for magnonic devices and circuits down to the two-dimensional limit. However, their short decay lengths pose challenges for practical applications. Here, we report on a material platform consisting of a van der Waals magnet, Fe$_5$GeTe$_2$ (FGT), and a ferrimagnetic insulator of yttrium iron garnet, Y$_3$Fe$_5$O$_{12}$ (YIG), which supports the low-loss propagation of spin waves. Using broadband spin-wave spectroscopy, we observed an increase in spin-wave group velocity with decreasing temperature, which peaks at 30 K in the YIG and FGT/YIG films. This effect is ascribed to a change in the saturation magnetization of YIG and FGT/YIG at low temperature, resulting in a change in the spin-wave dispersion relations. Using micromagnetic simulations, we further investigated spin-wave propagation in an FGT/YIG bilayer and revealed a longer spin-wave decay length in the bilayer than in a single FGT layer, which is due to the lower effective damping in the bilayer. Moreover, asymmetric spin-wave dispersion, induced by a chiral dipolar interaction between the YIG and FGT layers, enables nonreciprocal control of spin-wave propagation.

Key words: magnonics, spin waves, van der Waals magnets, yttrium iron garnet thin films

中图分类号:  (Scattering by phonons, magnons, and other nonlocalized excitations)

  • 72.10.Di
75.50.Gg (Ferrimagnetics) 76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance) 96.12.Hg (Magnetic field and magnetism)