Anomalous Refraction of Spin Waves as a Way to Guide Signals in Curved Magnonic Multimode Waveguides

Mieszczak, Szymon; Busel, Oksana; Gruszecki, Paweł; Kuchko, A. N.; Kłos, Jarosław W.; Krawczyk, Maciej

doi:10.1103/physrevapplied.13.054038

Cited by 21 publications

(17 citation statements)

References 66 publications

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“…Moreover, the assumed field vari-ation of 0.1 T over 10 μm length scales is also quantitatively challenging to implement, although the strong demagnetizing fields in patterned magnetic structures [19,20] and the stray field from the magnetic tip in FMRFM [26] suggest realistic ways forward. Yet, as with spin-wave Bloch oscillations [67], the effects described here are not restricted to graded magnetic fields [68] but could be generalized to other magnonic media with spatially varying characteristics, produced using the toolbox of graded index magnonics [69,70]. For instance, we note the two recent papers, which appeared while our paper was in review, studying spin-wave nonreciprocity in media with graded exchange [71] and magnetization [72].…”

Section: Discussionmentioning

confidence: 92%

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Fripp

Kruglyak

2021

Phys. Rev. B

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We have used micromagnetic simulations to model backward-volume dipole-exchange spin waves in graded profiles of the bias magnetic field. We demonstrate spin-wave wavelength conversion upon the wave's reflection from turning points due to the two characteristic minima ("U points") occurring in their dispersion at finite (nonzero) wave vectors. As a result, backward-volume dipole-exchange spin waves confined in "spin-wave wells" either form Möbius modes, making multiple real-space turns for each reciprocal-space round trip, or split into pairs of degenerate modes in the valleys near the two U points. The latter modes may therefore be assigned a pseudospin. We show that the pseudospin can be switched by scattering the spin wave from decreases of the bias magnetic field, while it is immune to scattering from field increases. Pseudospin creation and read-out can be accomplished using chiral spin-wave transducers, as described in Au et al. [Appl. Phys. Lett. 100, 182404 (2012)] and Au et al. [Appl. Phys. Lett. 100, 172408 (2012)], respectively. Taken together, the possibility of pseudospin creation, manipulation, and read-out suggests a path to development of a spin-wave version of valleytronics ("magnon valleytronics"), in which the pseudospin (rather than amplitude or phase) of spin waves would be used to encode data. Our results are not limited to graded bias magnetic field but can be generalized to other magnonic media with spatially varying characteristics, produced using the toolbox of graded index magnonics.

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Section: Discussionmentioning

confidence: 92%

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Fripp

Kruglyak

2021

Phys. Rev. B

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“…However, a translation symmetry break or a curved waveguide can convert symmetric into antisymmetric modes during wave propagation. [35][36][37] Here, the width of the signal line is much larger compared to the waveguide width, thus, the distribution of the RF field B CW can be assumed homogeneous across the lateral dimension. Nevertheless, the mode profile of k 2 reveals direct excitation of the antisymmetric mode n = 2 with a phase shift of Δφ = π. k 1a and k 1b show the expected symmetric mode profiles.…”

Section: Resultsmentioning

confidence: 99%

Demonstration of k-vector selective microscopy for nanoscale mapping of higher order spin wave modes

et al. 2020

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“…(4.6) or Ref. 40). The appearance of the phase ψ in the resonance conditions is related to the additional phase shift, which is acquired by an SW reflected from a boundary due to a nonzero polarization mismatch.…”

Section: B Finite Region With Different Sw Dispersion and Polarizationmentioning

confidence: 99%

“…Starting from seminal work by Rado and Weertman 28 there were many research interest to the boundary conditions at the ferromagnet interface, including study of the effect of magnetoelastic interaction 29 , finite width and diffusive character of interfaces [30][31][32] , nonuniform dipolar fields 33,34 , Dzyaloshinski-Moriya interaction 35 , magnetic anisotropy of interface 36,37 , etc. The problem of the SW reflection from a sharp boundary was studied in details for exchange-dominated SWs in isotropic, uniaxial and biaxial anisotropic ferromagnets [38][39][40] . The case of smooth interface was studied for both dipolar 6,7 and exchange-dominated SWs 30,31 .…”

Section: Introductionmentioning

confidence: 99%

Spin-wave transmission through an internal boundary: Beyond the scalar approximation

2020

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The transmission and reflection of a spin wave at an internal boundary created by the local variation of anisotropy (or a bias magnetic field) are studied taking into account not only the changes in the wave amplitude, but also the changes in the wave polarization. It is shown, that the account of the changes in the spin wave polarization before and after the boundary leads to: (i) increase of the spin wave amplitude reflection coefficient, (ii) appearance of an additional phase shift ∆φ = 0, π in both transmitted and reflected waves, and (iii) creation of additional evanescent waves in the vicinity of the boundary. It is also shown, that even when significant changes in the transmitted wave polarization take place at the boundary, a spin wave could pass a finitewidth boundary without reflection, if a certain resonance condition is satisfied. The effect of the polarization change at an internal boundary is especially pronounced for the exchange-dominated spin waves, while in the case of the dipole-dominated spin waves this effect can vanish completely for certain configurations of the static magnetization.

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Anomalous Refraction of Spin Waves as a Way to Guide Signals in Curved Magnonic Multimode Waveguides

Cited by 21 publications

References 66 publications

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Spin-wave wells revisited: From wavelength conversion and Möbius modes to magnon valleytronics

Demonstration of k-vector selective microscopy for nanoscale mapping of higher order spin wave modes

Spin-wave transmission through an internal boundary: Beyond the scalar approximation

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