Dynamics of spiral spin waves in magnetic nanopatches: Influence of thickness and shape

Ruiz, D. Osuna; Burgos-Parra, Erick; Bukin, N.; Heath, Mark; Lara, A.; Aliev, F. G.; Hibbins, Alastair P.; Ogrin, F. Y.

doi:10.1103/physrevb.100.214437

Cited by 8 publications

(2 citation statements)

References 41 publications

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“…By increasing b , A is decreased fast, while for b ≳ 0.7 all local perturbations of the z -component vanish. We expect that A can be further manipulated by tuning the layer thickness and the perpendicular magnetic anisotropy, an investigation that we leave for future work. The choice of α = 0.03, J / D = 5, and ρ = 30 a , results in an amplitude of about 15–20% × M s .…”

Section: Resultsmentioning

confidence: 99%

Spin Wave Radiation by a Topological Charge Dipole

et al. 2020

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The use of spin waves (SWs) as data carriers in spintronic and magnonic logic devices offers operation at low power consumption, free of Joule heating. Nevertheless, the controlled emission and propagation of SWs in magnetic materials remains a significant challenge. Here, we propose that skyrmion-antiskyrmion bilayers form topological charge dipoles and act as efficient sub-100 nm SW emitters when excited by in-plane ac magnetic fields. The propagating SWs have a preferred radiation direction, with clear dipole signatures in their radiation pattern, suggesting that the bilayer forms a SW antenna. Bilayers with the same topological charge radiate SWs with spiral and antispiral spatial profiles, enlarging the class of SW patterns. We demonstrate that the characteristics of the emitted SWs are linked to the topology of the source, allowing for full control of the SW features, including their amplitude, preferred direction of propagation, and wavelength.

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Section: Resultsmentioning

confidence: 99%

Spin Wave Radiation by a Topological Charge Dipole

et al. 2020

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“…Alternatively, natural internal magnetic field-inhomogeneities such as magnetic domain walls, can be used to generate spin waves in specific textures. − In particular, to overcome the minimum wavelength limit given by the characteristic sizes of patterned antennas, it has been shown recently that isotropically propagating spin waves with nanoscale wavelengths (∼100 nm) can be coherently generated by exploiting the dynamics of topological spin textures such as magnetic vortex cores. Driven by alternating magnetic fields and in the absence of magnetic anisotropies, these spin waves propagate away from the vortex core radially (Figure b) and are found both in synthetic ferrimagnetic systems as well as in single ferromagnetic layers. ,− However, in terms of signal transmission, a directional rather than radial emission and propagation of spin waves would be highly beneficial to reduce the effects of geometrical damping. Such a directional emission can, for example, be achieved in a synthetic ferrimagnet by introducing an intrinsic magnetic anisotropy to the system.…”

Section: Introductionmentioning

confidence: 99%

Spin-Wave Emission from Vortex Cores under Static Magnetic Bias Fields

et al. 2021

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We studied the influence of a static in-plane magnetic field on the alternating-field-driven emission of nanoscale spin waves from magnetic vortex cores. Time-resolved scanning transmission X-ray microscopy was used to image spin waves in disk structures of synthetic ferrimagnets and single ferromagnetic layers. For both systems, it was found that an increasing magnetic bias field continuously displaces the wave-emitting vortex core from the center of the disk toward its edge without noticeably altering the spin-wave dispersion relation. In the case of the single-layer disk, an anisotropic lateral expansion of the core occurs at higher magnetic fields, which leads to a directional rather than radial-isotropic emission and propagation of waves. Micromagnetic simulations confirm these findings and further show that focusing effects occur in such systems, depending on the shape of the core and controlled by the static magnetic bias field.

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Edge spin wave transmission through a vertex domain wall in triangular dots

Caso

Aliev

2022

SN Appl. Sci.

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Spin waves (SWs), being usually reflected by domain walls (DWs), could also be channeled along them. Edge SWs yield the interesting, and potentially applicable to real devices property of broadband spin wave confinement to the edges of the structure. Here, we investigate through numerical simulations the propagation of quasi one-dimensional spin waves in triangle-shaped amorphous YIG (Y3Fe5O12) micron sized ferromagnets as a function of the angle aperture. The edge spin waves (ESWs) have been propagated over the corner in triangles of 2 microns side with a fixed thickness of 85 nm. Parameters such as superior vertex angle (in the range of 40$$^\circ $$ ∘ –75$$^\circ $$ ∘ ) and applied magnetic field have been optimized in order to obtain a higher transmission coefficient of the ESWs over the triangle vertex. We observed that for a certain aperture angle for which dominated ESW frequency coincides with one of the localized DW modes, the transmission is maximized near one and the phase shift drops to $$\pi /2$$ π / 2 indicating resonant transmission of ESWs through the upper corner. We compare the obtained results with existing theoretical models. These results could contribute to the development of novel basic elements for spin wave computing.

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Dynamics of spiral spin waves in magnetic nanopatches: Influence of thickness and shape

Cited by 8 publications

References 41 publications

Spin Wave Radiation by a Topological Charge Dipole

Spin Wave Radiation by a Topological Charge Dipole

Spin-Wave Emission from Vortex Cores under Static Magnetic Bias Fields

Edge spin wave transmission through a vertex domain wall in triangular dots

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