Spin Wave Radiation by a Topological Charge Dipole

Díaz, Sebastián A.; Hirosawa, Tomoki; Loss, Daniel; Psaroudaki, Christina

doi:10.1021/acs.nanolett.0c02192

Cited by 16 publications

(10 citation statements)

References 53 publications

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“…1(c) with the contrast enhanced. The emission of spin waves by the skyrmion has a roughly circular symmetry, although around the skyrmion it can be seen that the spin wave is emitted as a spiral, similar to that seen in simulations of bilayer skyrmions 34 . For skyrmions with extended cores it has previously been shown that the excitation of the reversed magnetization of the core can produce spin waves 34,35 .…”

Section: Introductionsupporting

confidence: 73%

Interaction of propagating spin waves with extended skyrmions

Mansell

Schaffers

Holländer

et al. 2022

Applied Physics Letters

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Active control of propagating short-wavelength spin waves in perpendicularly magnetized materials is promising for designing nanoscale magnonic devices. One method of manipulating spin waves on the nanoscale is through their interaction with magnetic textures, an example of which is the magnetic skyrmion—a particle-like topological object stabilized in thin film heterostructures by the Dzyaloshinskii–Moriya interaction (DMI) and perpendicular magnetic anisotropy. In this paper, the interaction between spin waves and skyrmions is studied using micromagnetic simulations. The magnetic parameters chosen are similar to those found experimentally, leading to a skyrmion with an extended core of reversed magnetization. The effect of a propagating spin wave on the skyrmion is to cause the emission of a secondary spin wave by the skyrmion. At low frequencies, where the incoming spin wave wavelength is much larger than the skyrmion, this leads to a nearly circular re-emitted spin wave. The pattern of emission becomes increasingly complex at higher frequencies as the wavelength becomes similar to the skyrmion size due to the complex excitation of the extended core. The emitted spin wave profile can be controlled by altering the size of the skyrmion through the magnitude of the DMI, providing a method of tuning the system.

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Section: Introductionsupporting

confidence: 73%

Interaction of propagating spin waves with extended skyrmions

Mansell

Schaffers

Holländer

et al. 2022

Applied Physics Letters

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“…For example, the counterclockwise (CCW) and clockwise (CW) modes possess M 𝑥 and M 𝑦 , while the breathing mode possesses M 𝑧 , which was confirmed by the selection rule for the microwave spectroscopy [45,[56][57][58]. In addition to these magnetically active modes, SkXs support polygon deformation modes, arising from singleskyrmion bound states [27][28][29][30]. These modes are characterized by azimuthal quantum number ℓ [59], with ℓ = 2 for elliptic, ℓ = 3 for triangle, ℓ = 4 for square, ℓ = 5 for pentagon, and ℓ = 6 for hexagon, showing higher multipolar characters.…”

Section: B Skyrmion Crystal Phasementioning

confidence: 72%

“…According to previous studies, most of the bound states of a single skyrmion are found above the bulk continuum excitations of the ferromagnetic background [27,28,30]. To eliminate the bulk continuum from the low-energy spectrum, we introduce a magnetic field potential trap [see Fig.…”

Section: Appendix E: Hybridization Of Single-skyrmion Bound Statesmentioning

confidence: 99%

“…Recent years have seen a growing interest in magnetoelectric (ME) materials that host electrically controllable, topologically nontrivial magnetic textures such as skyrmions [16][17][18][19][20][21][22][23][24][25][26]. These are well-localized magnetic defects whose bound magnons [27][28][29][30] may get hybridized with superconducting qubits via cavitymediated interactions. Alternatively, skyrmions themselves may serve as qubits [31], with cavity MP coupling realizing qubit-qubit coupling.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoelectric Cavity Magnonics in Skyrmion Crystals

Hirosawa¹,

Mook²,

Klinovaja³

et al. 2022

Preprint

Self Cite

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We present a theory of magnetoelectric magnon-photon coupling in cavities hosting noncentrosymmetric magnets. Analogously to nonreciprocal phenomena in multiferroics, the magnetoelectric coupling is timereversal and inversion asymmetric. This asymmetry establishes a means for exceptional tunability of magnonphoton coupling, which can be switched on and off by reversing the magnetization direction. Taking the multiferroic skyrmion-host Cu 2 OSeO 3 as an example, we reveal the electrical activity of skyrmion eigenmodes and propose it for magnon-photon splitting of "magnetically dark" elliptic modes. Furthermore, we predict a cavity-induced magnon-magnon coupling between magnetoelectrically active skyrmion excitations. Our study highlights magnetoelectric cavity magnonics as a novel platform for realizing quantum-hybrid systems and the quantum control of topological magnetic textures.

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“…Very recently, Di ́az et al found that the interlayer exchange coupled skyrmion−antiskyrmion pair can serve as a spin-wave antenna, while such a system cannot sustain long-distance spin wave propagation. 48 In this work, we study the chiral emission of exchange spin waves by magnetic skyrmions using micromagnetic modeling. 49 A hybrid magnetic double layer system is investigated, where an ultrathin ferromagnetic metallic layer with interfacial DMI is on top and a magnetic thin-film insulator is on bottom.…”

mentioning

confidence: 99%

Chiral Emission of Exchange Spin Waves by Magnetic Skyrmions

Chen

2021

ACS Nano

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Spin waves or their quanta magnons raise the prospect to act as information carriers in the absence of Joule heating. The challenge to excite spin waves with nanoscale wavelengths free of nanolithography becomes a critical bottleneck for the application of nanomagnonics. Magnetic skyrmions are chiral magnetic textures at the nanoscale. In this work, short-wavelength exchange spin waves are demonstrated to be chirally emitted in a low damping magnetic insulating thin film by magnetic skyrmions. The spin-wave chirality originates from the chiral spin pumping effect and is determined by the cross product of the magnetization orientation and the film normal direction. The Halbach effect explains the enhancement or attenuation of the spin-wave amplitude with a reversed sign of the Dyzaloshinskii–Moriya interaction. Controllable spin-wave propagation is demonstrated by rotating a moderate applied field. Our findings are key for building compact low-power nanomagnonic devices based on intrinsic nanoscale magnetic textures.

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Spin Wave Radiation by a Topological Charge Dipole

Cited by 16 publications

References 53 publications

Interaction of propagating spin waves with extended skyrmions

Interaction of propagating spin waves with extended skyrmions

Magnetoelectric Cavity Magnonics in Skyrmion Crystals

Chiral Emission of Exchange Spin Waves by Magnetic Skyrmions

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