Theory and experiment on cavity magnon-polariton in the one-dimensional configuration

Yao, Bing; Gui, Y. S.; Xiao, Y.; Guo, Hong; Chen, X. S.; Lü, Wei; Chien, C. L.; Hu, C.‐M.

doi:10.1103/physrevb.92.184407

Cited by 74 publications

(60 citation statements)

References 37 publications

(57 reference statements)

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“…Such a special cavity offers an excellent mode profile controllability as we demonstrated in Ref. [25]. The inner diameter of the circular waveguide is 16.1 mm.…”

Section: Arxiv:180901233v1 [Cond-matmes-hall] 4 Sep 2018mentioning

confidence: 84%

Level Attraction Due to Dissipative Magnon-Photon Coupling

et al. 2018

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We report dissipative magnon-photon coupling caused by cavity Lenz effect, where the magnons in a magnet induce a rf current in the cavity, leading to a cavity back action that impedes the magnetization dynamics. This effect is revealed in our experiment as level attraction with a coalescence of hybridized magnon-photon modes, which is distinctly different from level repulsion with mode anticrossing caused by coherent magnon-photon coupling. We develop a method to control the interpolation of coherent and dissipative magnon-photon coupling, and observe a matching condition where the two effects cancel. Our work sheds light on the so-far hidden side of magnon-photon coupling, opening a new avenue for controlling and utilizing light-matter interactions.

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“…Such a special cavity offers an excellent mode profile controllability as we demonstrated in Ref. [25]. The inner diameter of the circular waveguide is 16.1 mm.…”

Section: Arxiv:180901233v1 [Cond-matmes-hall] 4 Sep 2018mentioning

confidence: 84%

Level Attraction Due to Dissipative Magnon-Photon Coupling

et al. 2018

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“…Recently, strong coupling between a microwave cavity mode and ferromagnetic resonance (FMR) has been realized at room temperature [6][7][8][9][10][11][12][13][14][15][16][17] . Exchange interactions lock the high density of spins in YIG into a macro-spin state, leading to strong coupling with a cavity mode which can be adjusted using an external magnetic field.…”

mentioning

confidence: 99%

Indirect coupling between two cavity modes via ferromagnetic resonance

Hyde

Bai

Harder

et al. 2016

Applied Physics Letters

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We experimentally realize indirect coupling between two cavity modes via strong coupling with the ferromagnetic resonance in Yttrium Iron Garnet (YIG). We find that some indirectly coupled modes of our system can have a higher microwave transmission than the individual uncoupled modes. Using a coupled harmonic oscillator model, the influence of the oscillation phase difference between the two cavity modes on the nature of the indirect coupling is revealed. These indirectly coupled microwave modes can be controlled using an external magnetic field or by tuning the cavity height. This work has potential for use in controllable optical devices and information processing technologies.The indirect coupling of cavity modes via a waveguide has been studied theoretically and experimentally for use in optical information processing 1 . This indirect coupling dramatically modifies the transmission spectra, and is widely used for optical filtering, buffering, switching, and sensing in photonic crystal structures 2-5 . For micro/nano disk optical cavities, coupling properties are determined by the spatial distance between the disk and the waveguide during the fabrication process. Therefore, a tunable coupling between indirectly coupled cavity modes is required for potential applications.Recently, strong coupling between a microwave cavity mode and ferromagnetic resonance (FMR) has been realized at room temperature 6-17 . Exchange interactions lock the high density of spins in YIG into a macro-spin state, leading to strong coupling with a cavity mode which can be adjusted using an external magnetic field. Potential applications of this form of strong coupling are currently being explored. For example, indirect coupling between the FMR in two YIG spheres has produced dark magnon modes with potential uses in information storage technologies 18 , and the FMR of YIG has been indirectly coupled with a qubit through a microwave cavity mode 19 . Instead of using a microwave cavity mode to build a bridge between two oscillators, we have used the FMR in YIG to produce indirect coupling between two cavity modes.In this work, we present two cavity modes which indirectly couple via their strong coupling with the FMR in YIG at room temperature. The two cavity modes are labelled h ω1 (ω) and h ω2 (ω) respectively, and are independent of each other when there is no direct coupling between them. Here ω 1 and ω 2 are the uncoupled resonance frequencies of each cavity mode and ω is the input microwave frequency. The two cavity modes can be indirectly coupled with each other when they both individually interact with the FMR in YIG and this indirect coupling can be controlled using an external magnetic field. We found that the microwave transmission properties change dramatically for the coupled modes as the external field is tuned. Our experimental results,

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“…The amplitude of this mode is ∼ 2% of the 14.391 GHz mode amplitude, and therefore has a negligible influence on the magnon-photon coupling, aside from a slight line shape distortion. 10 Measurements of the YIG FMR (not shown) follow the linear relation ω r /2π = γ (H + H A ), with a gyromagnetic ratio, γ = 28 × 2π µ 0 GHz/T and shape anisotropy field µ 0 H A = −44 mT. Additionally the Gilbert damping is found to be α = 0.81 × 10 −4 .…”

Section: Time Domain Measurements Of the Spin-photon Systemmentioning

confidence: 81%

Transient response of the cavity magnon-polariton

et al. 2019

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The Rabi oscillations of a coupled spin-photon system are experimentally studied using time domain microwave transmission measurements. An external magnetic bias field is applied to control the amplitude and frequency of Rabi oscillations, which are a measure of the coherent spin-photon energy exchange and coupling strength respectively. The amplitude and frequency control is described in the time domain as the transient response of a two-level spin-photon system. This approach reveals the link between steady state and transient behaviour of the cavity-magnon-polariton, which is necessary to interpret time domain cavity-spintronic experiments. This transient model also allows us to understand and quantify the polariton mode composition, which can be controlled by the bias field. arXiv:1904.08591v1 [cond-mat.mes-hall]

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Theory and experiment on cavity magnon-polariton in the one-dimensional configuration

Cited by 74 publications

References 37 publications

Level Attraction Due to Dissipative Magnon-Photon Coupling

Level Attraction Due to Dissipative Magnon-Photon Coupling

Indirect coupling between two cavity modes via ferromagnetic resonance

Transient response of the cavity magnon-polariton

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