Magnetic vortex cores as tunable spin-wave emitters

Wintz, Sebastian; Tiberkevich, Vasil; Weigand, Markus; Raabe, Jörg; Lindner, J.; Erbe, Artur; Slavin, A. N.; Faßbender, J.

doi:10.1038/nnano.2016.117

Cited by 196 publications

(195 citation statements)

References 47 publications

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“…The wavelength of emitted spin waves from these pointlike sources is roughly twice the nano-oscillator or laser spot size. Topological defects in magnetic films such as vortices and domain walls provide another means of local spin-wave emission [11][12][13]. Pinned magnetic domain walls in magnetic nanowires that are brought into oscillation by a microwave spin-polarized current, for instance, allow for monochromatic spin-wave emission up to high frequency [12].…”

Section: Introductionmentioning

confidence: 99%

Tunable Short-Wavelength Spin-Wave Emission and Confinement in Anisotropy-Modulated Multiferroic Heterostructures

Hämäläinen¹,

Brandl

Franke³

et al. 2017

Phys. Rev. Applied

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We report on the generation and confinement of short-wavelength spin waves in a continuous film with periodically modulated magnetic anisotropy. The concept, which is demonstrated for strain-coupled Co 40 Fe 40 B 20 =BaTiO 3 heterostructures, relies on abrupt rotation of magnetic anisotropy at the boundaries of magnetic stripe domains. In combination with an external bias field, this modulation of magnetic anisotropy produces a lateral variation of the effective magnetic field, leading to local spin-wave excitation when irradiated by a microwave magnetic field. In domains with small effective field, spin waves are perfectly confined by the spin gap in neighboring domains. In contrast, standing spin waves in domains with large effective field radiate into neighboring domains. Using micromagnetic simulation, we show that the wavelength of emitted spin waves is tunable from a few micrometers down to about 100 nm by rotation of the bias field. Importantly, the orientation of the wave front remains fixed. We also demonstrate that dynamic fluctuations of the effective magnetic field produce exchange-dominated spin waves at singleanisotropy boundaries. The multiferroic heterostructures presented here enable the use of global excitation fields from a microwave antenna to emit tunable spin waves from a nanometer-wide line source at welldefined locations of a continuous ferromagnetic film.

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Section: Introductionmentioning

confidence: 99%

Tunable Short-Wavelength Spin-Wave Emission and Confinement in Anisotropy-Modulated Multiferroic Heterostructures

Hämäläinen¹,

Brandl

Franke³

et al. 2017

Phys. Rev. Applied

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“…c 1 c 2 = −1 and c 3 c 4 = −1. Only for such circularity configurations there exist spin-wave modes with short wavelengths in the 100 nm regime 10 . Four highly symmetric (c, p)-configurations are schematically depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A further investigation of this simulation data (see also Supplementary Movie 2) reveals that both stacks emit a long and a short-wavelength mode as observed in ref. 10 . These two modes propagate in opposite directions, depending on the absolute circularity configuration in a stack.…”

Section: Micromagnetic Simulations Of Magnetisation Configurationsmentioning

confidence: 99%

“…Interference phenomena can be used to spatially confine the information that is essential for the application of spin waves [6][7][8][9] . Recently it has been shown that stacked vortex structures are efficient emitters of spin waves with tunable wavelength 10 . Spin waves emitted from these vortex stacks have a wavelength in the order of magnitude of 100 nm and thus open a path to miniaturisation.…”

mentioning

confidence: 99%

“…When excited with frequencies in the gigahertz regime, the vortex performs a low-amplitude gyration. A stack of two vortices can then serve as spin-wave emitter with a linear dispersion relation and thus tunable wavelength 10 .…”

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confidence: 99%

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Spin-wave interference in magnetic vortex stacks

et al. 2018

Self Cite

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Spin waves with wavelengths in the nanometre range could serve as data carriers in future magnonic logic or signal processing devices. We investigate the interference of spin waves emitted from magnetic vortices in two exchange-coupled vortex stacks. The spin-wave dynamics are studied using scanning transmission X-ray microscopy and micromagnetic simulations. Stacks of vortices provide an excellent controllability of spin-wave properties including a tunable wavelength in the 100 nm regime and manipulation of their propagation direction via the magnetisation configuration. Furthermore, interference gives rise to amplified or reduced spin-wave amplitudes in distinct areas of the structure providing controlled confinement crucial for future applications of spin waves.

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Active Ferromagnetic Metasurface with Topologically Protected Spin Texture for Spectral Filters

Chen

Cros

et al. 2022

Adv Funct Materials

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Electromagnetic metasurfaces modulate a material's response to electromagnetic waves by specifically arranged elements with dimensions below the wavelength. They have opened new fields of research, including flat optics and nanophotonics on a chip. Ferromagnetic metasurfaces could become the building blocks for manipulation of both microwaves and spin waves (magnons). So far, the functionality of magnonic devices has been limited by high intrinsic damping of the materials employed, suppressing long‐distance spin‐wave propagation. Here ferromagnetic metasurfaces are reported, which are created from periodic arrays of either 15 nm thick Co20Fe60B20, Ni80Fe20 or Co nanodisks on ferrimagnetic yttrium iron garnet (YIG) hosting topologically protected vortex states. This device, a reconfigurable spectral filter, operates in the microwave regime near 0.9 GHz and manipulates long‐distance spin‐wave transmission in thin YIG. An efficiency of 98.5% is demonstrated, with the metasurface covering only 15% of the microwave antenna. This first demonstration of a ferromagnetic metasurface opens unprecedented possibilities for on‐chip control of microwaves in low‐damping ferrimagnetic insulators.

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Magnetic vortex cores as tunable spin-wave emitters

Cited by 196 publications

References 47 publications

Tunable Short-Wavelength Spin-Wave Emission and Confinement in Anisotropy-Modulated Multiferroic Heterostructures

Tunable Short-Wavelength Spin-Wave Emission and Confinement in Anisotropy-Modulated Multiferroic Heterostructures

Spin-wave interference in magnetic vortex stacks

Active Ferromagnetic Metasurface with Topologically Protected Spin Texture for Spectral Filters

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