Hybridized magnon modes in the quenched skyrmion crystal

Takagi, Ryuzo; Garst, Markus; Sahliger, Jan; Back, Christian; Tokura, Y.; Seki, Shu

doi:10.1103/physrevb.104.144410

Cited by 14 publications

(6 citation statements)

References 34 publications

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“…However, for SkXs, we find that the skyrmion-skyrmion interaction with 𝐶 6 rotational symmetry breaks the rotational symmetry of polygon modes, resulting in strong hybridization with magnetically and/or electrically active modes , except for the triangle (sextupole) modes that are "magnetoelectrically dark." (For a detailed numerical investigation, see Appendix E.) Instead, it takes a small cubic anisotropy-which was neglected here-for the triangle modes to hybridize with other modes [60,61]. For experimental studies of ME MP coupling, the lowtemperature SkX phase provides an ideal platform, which can be realized in a thin film or quenched bulk crystal [17,60,61].…”

Section: B Skyrmion Crystal Phasementioning

confidence: 99%

“…(For a detailed numerical investigation, see Appendix E.) Instead, it takes a small cubic anisotropy-which was neglected here-for the triangle modes to hybridize with other modes [60,61]. For experimental studies of ME MP coupling, the lowtemperature SkX phase provides an ideal platform, which can be realized in a thin film or quenched bulk crystal [17,60,61]. Noting a remarkably small Gilbert damping and enhanced effective exchange interaction at low temperatures [38,63], the strong coupling limit can be realized with the magnetic coupling constant for the CCW and breathing modes potentially exceeding 500 MHz (cf.…”

Section: B Skyrmion Crystal Phasementioning

confidence: 99%

“…To enhance the magnon-photon coupling, we consider the low-temperature SkX that can be realized in a thin film sample or by quenching a bulk sample [17,60,61]. Using the expressions for energies and magnetic fields in the continuum limit [29], we rescale the energy eigenvalues of magnons and F3) and (F4).…”

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

confidence: 99%

See 2 more Smart Citations

Magnetoelectric Cavity Magnonics in Skyrmion Crystals

Hirosawa¹,

Mook²,

Klinovaja³

et al. 2022

Preprint

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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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Section: B Skyrmion Crystal Phasementioning

confidence: 99%

Section: B Skyrmion Crystal Phasementioning

confidence: 99%

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

confidence: 99%

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Magnetoelectric Cavity Magnonics in Skyrmion Crystals

Hirosawa¹,

Mook²,

Klinovaja³

et al. 2022

Preprint

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“…[35] The basic examples are the periodic stripe domains, which can be considered as 1D MCs [1,28] or skyrmion lattices, which also form a kind of 2D MC. [7,5,31,2] These structures have an important property; their magnetization structure is reconfigurable and sensitive to the external bias magnetic field; in this way, the magnonic band structure can be programmed after the manufacturing of the device, depending on the actual needs. [35] Nevertheless, the structures combining both patterning and magnetization texture are not yet well explored, in particular in the context of MCs and magnonics.…”

Section: Introductionmentioning

confidence: 99%

Spin-wave spectra in antidot lattice with inhomogeneous perpendicular magnetic anisotropy

Moalic

Krawczyk

Zelent

2022

Journal of Applied Physics

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Magnonic crystals are structures with periodically varied magnetic properties that are used to control collective spin-wave excitations. With micromagnetic simulations, we study spin-wave spectra in a 2D antidot lattice based on a multilayered thin film with perpendicular magnetic anisotropy (PMA). We show that the modification of the PMA near the antidot edges introduces interesting changes to the spin-wave spectra, even in a fully saturated state. In particular, the spectra split into two types of excitations: bulk modes with amplitude concentrated in a homogeneous part of the antidot lattice and edge modes with an amplitude localized in the rims of reduced PMA at the antidot edges. Their dependence on the geometrical or material parameters is distinct, but at resonance conditions fulfilled, we found strong hybridization between bulk and radial edge modes. Interestingly, the hybridization between the fundamental modes in bulk and rim is of magnetostatic origin, but the exchange interactions determine the coupling between higher-order radial rim modes and the fundamental bulk mode of the antidot lattice.

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“…Using the dynamic modes as experimental evidence for the LTS, we map out the phase diagram as a function of H and T . Finally, we systematically trace the mode hybridization between a dark higher-order clockwise mode and the breathing mode [23] as a function of temperature for two differently shaped crystals. We observe that the demagnetization field contribution to the gap size is negligible, consequently revealing the linear dependence on the strength of the magnetic anisotropies.…”

Section: Introductionmentioning

confidence: 99%

Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

Lee¹,

Sahliger²,

Aqeel³

et al. 2021

Preprint

Self Cite

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Recently, it has been shown that the chiral magnetic insulator Cu 2 OSeO 3 hosts skyrmions in two separated pockets in temperature and magnetic field phase space. It has also been shown that the predominant stabilization mechanism for the low-temperature skyrmion (LTS) phase is via the crystalline anisotropy, opposed to temperature fluctuations that stabilize the well-established high-temperature skyrmion (HTS) phase. Here, we report on a detailed study of LTS generation by field cycling, probed by GHz spin dynamics in Cu 2 OSeO 3 . LTSs are populated via a field cycling protocol with the static magnetic field applied parallel to the 100 crystalline direction of plate and cuboid-shaped bulk crystals. By analyzing temperature-dependent broadband spectroscopy data, clear evidence of low-temperature skyrmion excitations with clockwise (CW), counterclockwise (CCW), and breathing mode (BR) character at temperatures below T = 40 K are shown. We find that the mode intensities can be tuned with the number of field-cycles below the saturation field. By tracking the resonance frequencies, we are able to map out the field-cyclegenerated LTS phase diagram, from which we conclude that the LTS phase is distinctly separated from the high-temperature counterpart. We also study the mode hybridization between the dark CW and the BR modes as a function of temperature. By using two Cu 2 OSeO 3 crystals with different shapes and therefore different demagnetization factors, together with numerical calculations, we unambiguously show that the magnetocrystalline anisotropy plays a central role for the mode hybridization.

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Hybridized magnon modes in the quenched skyrmion crystal

Cited by 14 publications

References 34 publications

Magnetoelectric Cavity Magnonics in Skyrmion Crystals

Magnetoelectric Cavity Magnonics in Skyrmion Crystals

Spin-wave spectra in antidot lattice with inhomogeneous perpendicular magnetic anisotropy

Tunable gigahertz dynamics of low-temperature skyrmion lattice in a chiral magnet

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