Magnon-photon coupling in the noncollinear magnetic insulator 
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Abdurakhimov, L. V.; Khan, Safe; Panjwani, Naitik A.; Breeze, Jonathan; Mochizuki, Masahito; Seki, Shu; Tokura, Y.; Morton, John J. L.; Kurebayashi, Hidekazu

doi:10.1103/physrevb.99.140401

Cited by 24 publications

(26 citation statements)

References 48 publications

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“…It comes from the small mode volume V c ∼ 0.0051 mm 3 for the coplanar resonator and indicates the significance of having a localized and concentrated photon mode volume to reach a strong coupling strength. It is worthwhile to note a few different planar resonator designs such as split-ring [17,39,40] and lumped-element resonators [41,42]. The former allows an optimal filling of thin-film magnetic materials in the resonator, with g/2π close to 1 GHz; the latter has the highest g 0 by further reducing the mode volume.…”

Section: (A)mentioning

confidence: 99%

Strong Coupling between Magnons and Microwave Photons in On-Chip Ferromagnet-Superconductor Thin-Film Devices

et al. 2019

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We demonstrate strong magnon-photon coupling of a thin-film permalloy device fabricated on a coplanar superconducting resonator. A coupling strength of 0.152 GHz and a cooperativity of 68 are found for a 30-nm-thick permalloy stripe. The coupling strength is tunable by rotating the biasing magnetic field or changing the volume of permalloy. We also observe an enhancement of magnonphoton coupling in the nonlinear regime of the superconducting resonator, which is mediated by the nucleation of dynamic flux vortices. Our results demonstrate a critical step towards future integrated hybrid systems for quantum magnonics and on-chip coherent information transfer.

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Section: (A)mentioning

confidence: 99%

Strong Coupling between Magnons and Microwave Photons in On-Chip Ferromagnet-Superconductor Thin-Film Devices

et al. 2019

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“…In the context of dark matter detection, it has been shown that strongly coupled cavity-magnon systems are useful for expanding the range of detectable dark matter masses [11]. Typically, the material of choice for these experiments is Yttrium Iron Garnet (YIG) due to its low magnonic and photonic loss, and high spin density, however, other ferrimagnetic materials are often considered for study such as lithium ferrite (LiFe) [16] and Cu 2 OSeO 3 [17]. LiFe has been of recent interest for use in hybrid cavitymagnon systems due to is higher spin density when compared to YIG.…”

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confidence: 99%

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

et al. 2019

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Several experimental implementations of cavity-magnon systems are presented. First an Yttrium Iron Garnet (YIG) block is placed inside a re-entrant cavity where the resulting hybrid mode is measured to be in the ultra strong coupling (USC) regime. When fully hybridised the ratio between the coupling rate and uncoupled mode frequencies is determined to be g/ω=0.46. Next a thin YIG cylinder is placed inside a loop gap cavity. The bright mode of this cavity couples to the YIG sample and is similarly measured to be in the USC regime with ratio of coupling rate to uncoupled mode frequencies as g/ω=0.34. A larger spin density medium such as lithium ferrite (LiFe) is expected to improve couplings by a factor of 1.46 in both systems as coupling strength is shown to be proportional to the square root of spin density and magnetic moment. Such strongly coupled systems are potentially useful for cavity QED, hybrid quantum systems and precision dark matter detection experiments. The YIG disc in the loop gap cavity, is, in particular, shown to be a strong candidate for dark matter detection. Finally, a LiFe sphere inside a two post re-entrant cavity is considered. In past work it was shown that the magnon mode in the sample has a turnover point in frequency (Goryachev et al 2018 Phys. Rev. B 97 155129). Additionally, it was predicted that if the system was engineered such that it fully hybridised at this turnover point the cavity-magnon polariton transition frequency would become insensitive to both first and second order magnetic bias field fluctuations, a result useful for precision frequency applications. This work implements such a system by engineering the cavity mode frequency to near this turnover point, with suppression in sensitivity to second order bias magnetic field fluctuations shown.

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“…For example, either the oscillator or the dissipative third-party can be superconducting qubit [6,23], dielectric nanostructures [24], antiferromagnets [25,26], high-order spin wave modes [27] or other excitations such as phonons [28]. It has been reported recently that magnetic textures can also be coupled with the cavity photons [29,30]. Based on the understanding of dissipative coupling, the nonlinear effect [31,32] and topological properties of exceptional point [33][34][35][36] can be generalized and new physics is expected.…”

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confidence: 99%

Prediction of Attractive Level Crossing via a Dissipative Mode

et al. 2019

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The new field of spin cavitronics focuses on the interaction between the magnon excitation of a magnetic element and the electromagnetic wave in a microwave cavity. In strong interaction regime, such interaction usually gives rise to the level anti-crossing for the magnonic and the electromagnetic mode. Recently, the attractive level crossing has been observed, and is explained by a non-Hermitian model Hamiltonian. However, the mechanism of the such attractive coupling is still unclear. Here we reveal the secret by using a simple model with two harmonic oscillators coupled to a third oscillator with large dissipation. We further identify this dissipative third-party as the invisible cavity mode with large leakage in the cavity-magnon experiments. This understanding enables designing dissipative coupling in all sorts of coupled systems.

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Magnon-photon coupling in the noncollinear magnetic insulator Cu2OSeO3

Cited by 24 publications

References 48 publications

Strong Coupling between Magnons and Microwave Photons in On-Chip Ferromagnet-Superconductor Thin-Film Devices

Strong Coupling between Magnons and Microwave Photons in On-Chip Ferromagnet-Superconductor Thin-Film Devices

Experimental implementations of cavity-magnon systems: from ultra strong coupling to applications in precision measurement

Prediction of Attractive Level Crossing via a Dissipative Mode

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