Excitation and tailoring of diffractive spin-wave beams in NiFe using nonuniform microwave antennas

Körner, H. S.; Stigloher, J.; Back, Christian

doi:10.1103/physrevb.96.100401

Cited by 20 publications

(15 citation statements)

References 29 publications

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“…One of the most versatile methods for spin‐wave emission is based on using patterned shaped microantennas, for generating a localized oscillating magnetic field in correspondence of the magnetic material . However, the emission of spin waves with sub‐micrometric wavelength is challenging due to the slow spatial decay of the field and the high impedance of the antennas as the size approaches nanoscale dimensions .…”

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confidence: 99%

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

et al. 2020

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Integrated optically inspired wave‐based processing is envisioned to outperform digital architectures in specific tasks, such as image processing and speech recognition. In this view, spin waves represent a promising route due to their nanoscale wavelength in the gigahertz frequency range and rich phenomenology. Here, a versatile, optically inspired platform using spin waves is realized, demonstrating the wavefront engineering, focusing, and robust interference of spin waves with nanoscale wavelength. In particular, magnonic nanoantennas based on tailored spin textures are used for launching spatially shaped coherent wavefronts, diffraction‐limited spin‐wave beams, and generating robust multi‐beam interference patterns, which spatially extend for several times the spin‐wave wavelength. Furthermore, it is shown that intriguing features, such as resilience to back reflection, naturally arise from the spin‐wave nonreciprocity in synthetic antiferromagnets, preserving the high quality of the interference patterns from spurious counterpropagating modes. This work represents a fundamental step toward the realization of nanoscale optically inspired devices based on spin waves.

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confidence: 99%

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

et al. 2020

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“…We believe the proposed system can be a good playground to study SW beam guiding and can be directly used for an experimental demonstration of the investigated effects, e.g., using recently experimentally validated in Ref. [50] method of SW beams excitation. Fig.…”

Section: B Micromagnetic Simulationsmentioning

confidence: 98%

Spin-wave beam propagation in ferromagnetic thin films with graded refractive index: Mirage effect and prospective applications

Gruszecki

Krawczyk

2018

Phys. Rev. B

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Using analysis of iso-frequency contours of the spin-wave dispersion relation, supported by micromagnetic simulations, we study the propagation of spin-wave (SW) beams in thin ferromagnetic films through the areas of the inhomogeneous refractive index. We compare the transmission and reflection of SWs in areas with gradual and step variation of the SW refractive index. In particular, we show the mirage effect for SWs with narrowing SW beam width, and an application of the gradual modulation of the SWs refractive index as a diverging lens. Furthermore, we study the propagation of SWs in ferromagnetic stripe with modulated refractive index. We demonstrate that the system can be considered as the graded-index waveguide, which preserves the width of the SW beam for a long distance -the property essential for prospective applications of magnonics. arXiv:1707.09768v4 [cond-mat.mes-hall]

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“…[6][7][8][9][10][11][12][13] However, the dynamics of the collective coordinates also depends strongly on the spin-wave amplitude ρ. Since the spin-wave amplitude depends on the frequency of the applied excitation field [25][26][27][28] it is the spatial profile of the applied excitation field that plays the main role in determining the frequency dependence of the domain wall velocity in some of these studies.…”

Section: Equations Of Motionmentioning

confidence: 99%

“…Eqs. (27) can be derived as special cases of Kalinikos' general formula. 25 As illustrated in Figure 4, the spin-wave amplitudes depend strongly on the driving frequency and the spatial profile of the applied magnetic field.…”

Section: Frequency Dependence Of the Spin-wave Amplitudementioning

confidence: 99%

“…The spatial profile of the microwave source determines how the spin-wave amplitude depends on the driving frequency. [25][26][27][28] We derive a special case of Kalinikos' general formula 25 and show that the spin-wave amplitude is proportional to the Fourier sine transform of the source profile. We then use the dependence of the spin-wave amplitude on the microwave frequency to find consistent results for how the domain wall velocity depends on the driving frequency in the numerical and analytical calculations.…”

Section: Introductionmentioning

confidence: 99%

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Equations of motion and frequency dependence of magnon-induced domain wall motion

et al. 2017

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Spin waves can induce domain wall motion in ferromagnets. We derive the equations of motion for a transverse domain wall driven by spin waves. Our calculations show that the magnonic spin-transfer torque does not cause rotation-induced Walker breakdown. The amplitude of spin waves that are excited by a localized microwave field depends on the spatial profile of the field and the excitation frequency. By taking this frequency dependence into account, we show that a simple one-dimensional model may reproduce much of the puzzling frequency dependence observed in early numerical studies.

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Excitation and tailoring of diffractive spin-wave beams in NiFe using nonuniform microwave antennas

Cited by 20 publications

References 29 publications

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Spin-wave beam propagation in ferromagnetic thin films with graded refractive index: Mirage effect and prospective applications

Equations of motion and frequency dependence of magnon-induced domain wall motion

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