Magnon-bandgap controllable artificial domain wall waveguide

• Published in: Applied physics letters Vol. 122; no. 24
• Main Authors: Yu, Hai, Ma, Xiao-Ping, Zhang, Huanhuan, Zhang, Xue-Feng, Luo, Zhaochu, Piao, Hong-Guang
• Format: Journal Article
• Language: English
• Published: Melville American Institute of Physics 12.06.2023
• Subjects: Applied physics; Controllability; Domain walls; Energy gap; High pass filters; Magnetic anisotropy; Magnons; Wave propagation; Waveguides
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/5.0143444

In this paper, a magnon-bandgap controllable artificial domain wall waveguide is proposed by means of micromagnetic simulation. By the investigation of the propagation behavior and dispersion relationship of spin waves in artificial domain wall waveguides, it is found that the nonreciprocal propagation of spin waves in the artificial domain walls is mainly affected by the local effective exchange field, and the magnon bandgap can be controlled by changing the maximum value of the effective exchange field. In addition, it is observed that the artificial domain wall waveguides are structurally more stable than the natural domain wall waveguides under the same spin wave injection conditions, and the magnon bandgap of the artificial domain wall waveguides can be adjusted by its width and magnetic anisotropy parameters. The bandgap controllable artificial domain wall scheme is beneficial to the miniaturization and integration of magnon devices and can be applied to future magnonic technology as a high-pass filter with adjustable cutoff frequency.