Magnon-magnon coupling in noncollinear synthetic antiferromagnets
Tengfei Zhang(张腾飞)1, Quwen Wang(王曲文)1, Min Chen(陈敏)2, Jie Dong(董洁)1, Qian Zhao(赵乾)1, Zimu Li(李子木)1, Qingfang Liu(刘青芳)1, Jianbo Wang(王建波)1, and Jinwu Wei(魏晋武)1,†
1 School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China; 2 Southwest Institute of Applied Magnetics, Mianyang 621000, China
Abstract We report a theoretical analysis of magnon-magnon coupling in a noncollinear magnetic sandwiched structure with interlayer exchange interaction, which consists of two ferromagnetic layers with perpendicular and in-plane magnetic anisotropy, respectively. Based on the Landau-Lifshitz equation, the spin wave dispersion is derived, and then the frequency gap is observed due to the magnon-magnon coupling effect induced by symmetry breaking. The influence of saturation magnetization, exchange coupling interaction, perpendicular magnetic anisotropy, and wave vector on the coupling strength is studied in detail. We find that the coupling strength is strongly dependent on the saturation magnetization and a small saturation magnetization can lead to strong coupling strength. By selecting the appropriate magnetic materials, the ultra-strong coupling regime can be achieved. The precession information in time domain is solved and the alternating change of the precession components in two ferromagnetic layers implies the exchange of energy and information.
(Scattering by phonons, magnons, and other nonlocalized excitations)
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 52201290), the Natural Science Foundation of Gansu Province (Grant No. 24JRRA402), and the 9th Research Institute of China Electronics Technology Group Corporation’s open projects (Grant No. 2024SK-001-4).
Tengfei Zhang(张腾飞), Quwen Wang(王曲文), Min Chen(陈敏), Jie Dong(董洁), Qian Zhao(赵乾), Zimu Li(李子木), Qingfang Liu(刘青芳), Jianbo Wang(王建波), and Jinwu Wei(魏晋武) Magnon-magnon coupling in noncollinear synthetic antiferromagnets 2025 Chin. Phys. B 34 057201
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