Exchange magnon-polaritons in microwave cavities

Cao, Yunshan; Peng, Yan; Huebl, Hans; Goennenwein, Sebastian T. B.; Bauer, G.

doi:10.1103/physrevb.91.094423

Cited by 195 publications

(181 citation statements)

References 41 publications

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“…The "magnon" refers to the collective excitation of spin systems. In paramagnetic spin ensembles in an applied magnetic field, the spins precess coherently in the presence of microwave radiation, creating hybridized states referred to as magnon-polaritons [6][7][8]. In the strong-coupling regime coherent energy exchange exceeds the dissipative loss of both subsystems.…”

Section: Introductionmentioning

confidence: 99%

“…(i) strong coupling (SC) when 0.01 < g/ω c 0.1, (ii) ultrastrong coupling (USC) [26] when g/ω c 0.1, (iii) or even deep strong coupling (DSC) g/ω c ≈ 1 [27]. Cao et al [8] adapted the TC model to ferromagnets by formulating a first-principles scattering theory of the coupled cavity-ferromagnet system based on the Maxwell and the Landau-Lifshitz-Gilbert equation including the exchange interaction. A effectively onedimensional system of a thin film with in-plane magnetization in a planar cavity was solved exactly in the linear regime, exposing, for example, strong coupling to standing spin waves.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic spheres in microwave cavities

2015

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We apply Mie scattering theory to study the interaction of magnetic spheres with microwaves in cavities beyond the magnetostatic and rotating wave approximations. We demonstrate that both strong and ultrastrong coupling can be realized for stand alone magnetic spheres made from yttrium iron garnet (YIG), acting as an efficient microwave antenna. The eigenmodes of YIG spheres with radii of the order mm display distinct higher angular momentum character that has been observed in experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic spheres in microwave cavities

2015

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“…For example, CMP effect has recently been observed by setting miligrams of magnetic nano-particles inside a special circular waveguide cavity 11 , where the CMP coupling can be analyzed in the simple 1D configuration by using either the straightforward transfer matrix method 11 , or equivalently, the 1D scattering theory 12 . It is found that the CMP coupling enables quantifying the complex permeability of magnetic nanoparticles with high sensitivity, which was an outstanding challenge for the biomedical applications of magnetic nanoparticles 11 .…”

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confidence: 99%

On-chip artificial magnon-polariton device for voltage control of electromagnetically induced transparency

Kaur¹,

Yao²,

Gui³

et al. 2016

J. Phys. D: Appl. Phys.

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We demonstrate an on-chip device utilizing the concept of artificial cavity magnon-polariton (CMP) coupling between the microwave cavity mode and the dynamics of the artificial magnetism in a split ring resonator. This on-chip device allows the easy tuning of the artificial CMP gap by using a DC voltage signal, which enables tuneable electrodynamically induced transparency. The high tunability of the artificial magnon-polariton system not only enables the study of the characteristic phenomena associated with distinct coupling regimes, but also may open up avenues for designing novel microwave devices and ultra-sensitive sensors.When an electromagnetic wave propagates in a magnetic material, its magnetic fields can drive the magnetization precession and the mutual coupling between the macroscopic electrodynamic and magnetization dynamic results in a hybrid electromagnetic mode of media, i.e., magnon polariton 1 . In light of this principle, a cavity magnon polariton (CMP) has been recently studied in a coupled magnon-cavity photon system 2 , where the general feature of the CMP is described in a concise classical model 2 which accurately highlights the key physics of phase correlation between the cavity and magetization resonances. This general CMP model can be used to quantitatively analyze the characteristic features of magnon-photon coupling experiments recently performed by many different groups 2-10 , in which a low damping bulk ferromagnetic insulator is set either on-top of a superconducting co-plannar waveguide or inside a high quality 3D microwave cavity.The intriguing physics of CMP opens up new avenues for materials characterization and microwave applications. For example, CMP effect has recently been observed by setting miligrams of magnetic nano-particles inside a special circular waveguide cavity 11 , where the CMP coupling can be analyzed in the simple 1D configuration by using either the straightforward transfer matrix method 11 , or equivalently, the 1D scattering theory 12 . It is found that the CMP coupling enables quantifying the complex permeability of magnetic nanoparticles with high sensitivity, which was an outstanding challenge for the biomedical applications of magnetic nanoparticles 11 . In 3D microwave cavities, it is shown that the CMP coupling leads to the electromagnetically induced transparency (EIT), which is tuneable by applying an external magnetic field 5 . Such a tuneable EIT is of great importance for designing microwave circuits.From the perspective of device application the external magnetic field used to alter the resonance frequency of the magnon, and the size of the 3D cavity are not favourable. Inspired by the study of artificial magnetism 13,14 , where the non-magnetic conducting material is designed to provide a magnetic response at microwave frequencies, in this paper, we report on a 2D artificial CMP system created by integrating an artificial magnetic resonator with an on-chip cavity resonator. Here the cavity mode and the artificial magnon mode are generated by a ...

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“…Together, these latter parameters determine the coupling features of the system that can be configured from weak (K/α <1 and K/β <1) to strong coupling regime (K/α >1 and k/β >1). K can be tuned with (i) the volume of YIG 14,16 , (ii) the volume of the cavity 24 , and (iii) the magnitude of the microwave magnetic field 3,16 . Control of the coupling regime has been already demonstrated 7,25 by tuning the cavity losses β.…”

Section: B Thermal Controlmentioning

confidence: 99%

“…More recently, research groups 6-8 have developed an electrical method to detect magnons coupled with photons. This method has been established by placing a hybrid YIG/platinum (Pt) system into a microwave cavity, showing distinct features not seen in any previous spin pumping experiment but already predicted by Cao et al 14 . These later studies have been realized in a 3D cavity (with high Q factor), but insertion of an hybrid stack including a highly electrical conductor such as platinum has been reported to induce a drastic enhancement of the intrinsic loss rate.…”

Section: Introductionmentioning

confidence: 99%

Thermal control of the magnon-photon coupling in a notch filter coupled to a yttrium iron garnet/platinum system

et al. 2017

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We report thermal control of mode hybridization between the ferromagnetic resonance (FMR) and a planar resonator (notch filter) working at 4.74 GHz. The chosen magnetic material is a ferrimagnetic insulator (Yttrium Iron Garnet: YIG) covered by 6 nm of platinum (Pt). A currentinduced heating method has been used in order to enhance the temperature of the YIG/Pt system. The device permits us to control the transmission spectra and the magnon-photon coupling strength at room temperature. These experimental findings reveal potentially applicable tunable microwave filtering function.

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Exchange magnon-polaritons in microwave cavities

Cited by 195 publications

References 41 publications

Magnetic spheres in microwave cavities

Magnetic spheres in microwave cavities

On-chip artificial magnon-polariton device for voltage control of electromagnetically induced transparency

Thermal control of the magnon-photon coupling in a notch filter coupled to a yttrium iron garnet/platinum system

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