Theory of three-magnon interaction in a vortex-state magnetic nanodot

Verba, Roman; Körber, Lukas; Schultheiß, Katrin; Schultheiß, Helmut; Tiberkevich, Vasil; Slavin, A. N.

doi:10.1103/physrevb.103.014413

Cited by 25 publications

(22 citation statements)

References 38 publications

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“…As a consequence of the spatial antisymmetry of this component, 3M confluence from mode |1⟩ into laterally totally antisymmetric modes should have a sizable scattering rate, while confluence into symmetric modes is prohibited. 32,35,37 Because the modes |4⟩ and |5⟩ are almost but not perfectly symmetric, their small scattering rate in the parallel state is consistent with the theoretical picture.…”

Section: ■ Results and Discussionsupporting

confidence: 78%

“…, with a being the mode amplitude. 21 Using the vector Hamiltonian approach, 35,46 we can write the magnon interaction coefficient…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The magnetic Hamiltonian term, which describes the confluence of two | i ⟩ magnons into one | j ⟩ magnon (as well as the inverse process), is , with a being the mode amplitude . Using the vector Hamiltonian approach, , we can write the magnon interaction coefficient ψ ij as The interaction is largely related to dipolar coupling between the magnons, and the operator N̂ can be written in the integral form with the magnetostatic Green’s function kernel having components . The diagonal components of the integral kernel are symmetric in space, while off-diagonal ones are antisymmetric.…”

Section: Resultsmentioning

confidence: 99%

“…Besides the energy conservation requirement given by the frequency ratio, the 3M scattering is determined by the strength of interaction between the magnon modes involved in the process. ,, In nanomagnets possessing the symmetry of an orthogonal coordinate system (e.g., rectangular, circular, and elliptical) and with negligible magnetic anisotropy, the number of 3M processes allowed by symmetry is greatly reduced, as recently shown in refs , , and . However, irregularities of demagnetization field at the nanomagnet’s edges, as well as inevitable structural imperfections, , can diminish the symmetry restrictions and lead to a finite, albeit small, magnon interaction.…”

Section: Introductionmentioning

confidence: 99%

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Controlling Magnon Interaction by a Nanoscale Switch

Etesamirad

Rodriguez

Bocanegra

et al. 2021

ACS Appl. Mater. Interfaces

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The ability to control and tune magnetic dissipation is a key concept of emergent spintronic technologies. Magnon scattering processes constitute a major dissipation channel in nanomagnets, redefine their response to spin torque, and hold the promise for manipulating magnetic states on the quantum level. Controlling these processes in nanomagnets, while being imperative for spintronic applications, has remained difficult to achieve. Here, we propose an approach for controlling magnon scattering by a switch that generates nonuniform magnetic field at nanoscale. We provide an experimental demonstration in magnetic tunnel junction nanodevices, consisting of a free layer and a synthetic antiferromagnet. By triggering the spin-flop transition in the synthetic antiferromagnet and utilizing its stray field, magnon interaction in the free layer is toggled. The results open up avenues for tuning nonlinearities in magnetic neuromorphic applications and for engineering coherent magnon coupling in hybrid quantum information technologies.

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Section: ■ Results and Discussionsupporting

confidence: 78%

“…, with a being the mode amplitude. 21 Using the vector Hamiltonian approach, 35,46 we can write the magnon interaction coefficient…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Controlling Magnon Interaction by a Nanoscale Switch

Etesamirad

Rodriguez

Bocanegra

et al. 2021

ACS Appl. Mater. Interfaces

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“…3. This is very different from the splitting of a radial spinwave mode into two azimuthal spin-wave modes, where the radial quantum number radically changes [30,42].…”

mentioning

confidence: 77%

Twisted Magnon Frequency Comb and Penrose Superradiance

Wang,

Yuan,

Cao

et al. 2022

Preprint

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Quantization effects of the nonlinear magnon-vortex interaction in ferromagnetic nanodisks are studied. We show that the circular geometry twists the spin-wave fields with spiral phase dislocations carrying quantized orbital angular momentum (OAM). Meanwhile, the confluence and splitting scattering of twisted magnons off the gyrating vortex core (VC) generates a frequency comb consisting of discrete and equally spaced spectral lines, dubbed as twisted magnon frequency comb (tMFC). It is found that the mode spacing of the tMFC is equal to the gyration frequency of the VC and the OAM quantum numbers between adjacent spectral lines differ by one. By applying a magnetic field perpendicular to the plane of a thick nanodisk, we observe a magnonic Penrose superradiance inside the cone vortex state, which mimics the amplification of waves scattered from a rotating black hole. It is demonstrated that the higher-order modes of tMFC are significantly amplified while the lower-order ones are trapped within the VC gyrating orbit which manifests as the ergoregion. These results suggest a promising way to generate twisted magnons with large OAM and to drastically improve the flatness of the magnon comb.

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