Observation of the dispersion relations for quantized coherent spin waves excited by a microwave antenna

Shiota, Yoichi; Hisatomi, Ryusuke; Moriyama, Takahiro; Ono, Teruo

doi:10.1103/physrevb.102.214440

Phys. Rev. B

2020

DOI: 10.1103/physrevb.102.214440

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Observation of the dispersion relations for quantized coherent spin waves excited by a microwave antenna

Yoichi Shiota

Ryusuke Hisatomi

Takahiro Moriyama

et al.

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Cited by 4 publications

(1 citation statement)

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“…In this study, we measured the spatial distribution of propagating magnons in SAFs using a heterodyne-magnetooptical Kerr effect (MOKE) technique 31,32) and obtained magnon dispersion relation which is important to understand the magnon properties. We have directly observed the mode splitting in the dispersion relation due to the hybridization of two antiferromagnetic resonance modes.…”

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confidence: 99%

Observation of mode splitting by magnon–magnon coupling in synthetic antiferromagnets

Hayashi

Shiota

Ishibashi

et al. 2023

Appl. Phys. Express

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We investigated the coherently excited propagating magnons in in-plane magnetized synthetic antiferromagnets using heterodyne-magneto-optical Kerr effect technique. Under the in-plane magnetic field to 45° away from the magnon propagation direction, we observed the mode splitting of magnon dispersion relation due to the magnon-magnon coupling between acoustic and optical magnon modes. The strong coupling with a cooperativity of 8.4 ± 1.3 is achieved for finite wavenumber. These results provide a deep understanding of the properties of coherently excited magnons in synthetic antiferromagnets, which will be helpful for designing advanced magnonic devices.

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mentioning

confidence: 99%

Observation of mode splitting by magnon–magnon coupling in synthetic antiferromagnets

Hayashi

Shiota

Ishibashi

et al. 2023

Appl. Phys. Express

Self Cite

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Real-space observation of standing spin-wave modes in a magnetic disk

Hioki

Araki

Umemura

et al. 2022

Applied Physics Letters

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In-plane standing spin-wave modes in a minute magnetic disk are directly observed by using time-resolved magneto-optical microscopy synchronized with microwaves. The time-resolved microscopy allowed us to obtain snapshots of standing spin-wave modes in a magnetic disk, which show a hourglass-like standing spin wave pattern. We found that the characteristic pattern is caused by spatially nonuniform magnetization and a strong microwave excitation in terms of finite element calculation and micromagnetic simulations. The technique we developed in this work allows us to access magnetization dynamics in microstructured magnets under strong microwave pumping.

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Mode transformation of dynamic spin wave well modes in the magnetic stripes

Li,

Yao,

et al. 2024

Applied Physics Letters

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In this work, we present an experimental and micromagnetic simulation study of the mode transformation of dynamic spin wave well modes in the magnetic stripes. With a highly precise lock-in ferromagnetic resonance measurement system, the spin wave modes, including the quantized backward volume magnetostatic spin waves and the spin wave well modes, can both be clearly detected in the transversely magnetized stripes. The mode transformations of dynamic spin wave well modes are detected in a field range that the moments near the edge of the stripe are not fully magnetized. Further micromagnetic simulation and analyzation show that the boundary condition change in the potential well might be the main reason for the mode transformation of spin wave well modes. These results might be helpful for the further understanding of the spin wave dynamics in the finite ferromagnets.

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Observation of the dispersion relations for quantized coherent spin waves excited by a microwave antenna

Cited by 4 publications

References 43 publications

Observation of mode splitting by magnon–magnon coupling in synthetic antiferromagnets

Observation of mode splitting by magnon–magnon coupling in synthetic antiferromagnets

Real-space observation of standing spin-wave modes in a magnetic disk

Mode transformation of dynamic spin wave well modes in the magnetic stripes

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