Compression gain of spin wave signals in a magnonic YIG waveguide with thermal non-uniformity

Kolokoltsev, Oleg; Gómez-Arista, Iván; Qureshi, Naser; Acevedo, A.; Ordóñez‐Romero, César L.; Grishin, Alexander M.

doi:10.1016/j.jmmm.2014.10.001

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…(iv) The wave amplitude increase (seen as brightening of the real-space trajectories in Figs. 2-4) near the high-field turning points is due to the wave shoaling effect (i.e., energy concentration due to reduction of the group velocity), as discussed earlier for other types of spin waves [59,60].…”

Section: Discussionmentioning

confidence: 73%

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: 73%

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

Fripp

Kruglyak

2021

Phys. Rev. B

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Section: Discussionmentioning

confidence: 99%

“…This leads to the increase of a peak and average amplitude of the pulse envelope for pulse power to be conserved. The effect has been analyzed in [32], where we used a large diameter loop antenna that was not sensitive to the effect of the transversal confinement of the evanescent field shown in Fig.4, 115 and 5. On the other hand, the results presented in Fig.3, 4, and 5 indicate that increasing the sample temperature increases the coupling between MSSW field and the micro-antenna.…”

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confidence: 99%

Thermally controlled confinement of spin wave field in a magnonic YIG waveguide

Borys

Kolokoltsev

Gómez-Arista

et al. 2020

Journal of Magnetism and Magnetic Materials

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Methods for detecting spin waves rely on electrodynamical coupling between the spin wave dipolar field and an inductive probe. While this coupling is usually treated as constant, in this work, we experimentally and theoretically show that it is indeed temperature dependent. By measuring the spin wave magnetic field as a function of temperature of, and distance to the sample, we demonstrate that there is both a longitudinal and transversal confinement of the field near the YIG-Air interface. Our results are relevant for spin wave detection, in particular in the field of spin wave caloritronics.

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