Demonstration of <i>k</i>-vector selective microscopy for nanoscale mapping of higher order spin wave modes

Träger, Nick; Gruszecki, Paweł; Lisiecki, Filip; Groß, Felix; Förster, Jens; Weigand, Markus; Głowiński, Hubert; Kuświk, Piotr; Dubowik, J.; Krawczyk, Maciej; Gräfe, Joachim

doi:10.1039/d0nr02132f

Cited by 15 publications

(11 citation statements)

References 41 publications

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“…Therefore, single‐ and multi‐carrier waveforms between 20 and 30 GHz are very promising for increasing transmission rates and combining communication and sensing. [ 6 ] To this end, magnonic waveguides show outstanding characteristics for reliable multimode propagation, [ 11–14 ] which could define the backbone of magnonic building blocks in prospective radar applications. [ 3,15 ]…”

Section: Figurementioning

confidence: 99%

“…[18,19] Furthermore, both symmetric and antisymmetric spin wave mode excitations in magnonic waveguides were already shown experimentally, which can also be observed in this study at higher frequencies. [11,12] Here, we extend the long axis of the magnonic waveguide to avoid standing spin wave patterns, and thus, we are able to show spin wave emission only from a single edge into the waveguide. Thereby, we also demonstrate STXM imaging at the higher frequencies up to 20.5 GHz.…”

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confidence: 99%

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Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz

Träger

Gruszecki

Lisiecki

et al. 2020

Physica Rapid Research Ltrs

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The rising research field of magnonics, which is named after the quanta of spin waves, represents a potential candidate for substituting electronic devices as information carriers at the nanoscale. [1-5] Nevertheless, data communication does not represent the only prospective route for magnonics. High-frequency radar systems get increasingly important, e.g., for autonomous driving. This requires very accurate and fast position tracking as well as communication with surrounding vehicles. [6] However, complex electronic building blocks for radar transceivers are vulnerable for nonlinearities at high frequencies and, thus, cause serious problems regarding reliable detection and communication. [6-9] With respect to higher stability, higher data throughput, and faster logic operations at frequencies above 10 GHz, magnonic circuits represent a very promising approach, which allows for substituting several electronic elements in current radar systems. [10] Radar sensors typically require a larger signal bandwidth than communication signals. Thus, high performance in both radar and communication applications requires fine-tuning of signals and advanced bandwidth concepts. Therefore, single-and multi-carrier waveforms between 20 and 30 GHz are very promising for increasing transmission rates and combining communication and sensing. [6] To this end, magnonic waveguides show outstanding characteristics for reliable multimode propagation, [11-14] which could define the backbone of magnonic building blocks in prospective radar applications. [3,15] In this work, we demonstrate the spatially and temporally resolved observation of spin wave excitation and propagation in such magnonic cobalt-iron (CoFe) waveguides at the nanoscale by time-resolved scanning transmission X-ray microscopy (STXM). The large saturation magnetization of CoFe results

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Section: Figurementioning

confidence: 99%

mentioning

confidence: 99%

Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz

Träger

Gruszecki

Lisiecki

et al. 2020

Physica Rapid Research Ltrs

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“…Therefore, the focus shifted from breaking the continuous symmetry to breaking a discrete one, introducing the Floquet time crystal. Many proposals have since followed to realize such a Floquet time crystal in different systems [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and several experimental realizations using different systems have been demonstrated [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

On the long-term stability of space-time crystals

Smits,

Stoof,

van der Straten

2020

Preprint

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We investigate a space-time crystal in a superfluid Bose gas. Using a well-controlled periodic drive we excite only one crystalline mode in the system, which can be accurately modeled in the rotating frame of the drive. Using holographic imaging we observe the stability of the crystal over an extended period of time and show the robustness of its structure in both space and time. By introducing a fourth-order term in the Hamiltonian we show that the crystal stabilizes at a fixed number of quanta. The results of the model are compared to the experimental data and show good agreement, with a small number of free parameters. The results yield insights in the long-term stability of the crystal, which can only be obtained by the combination of the extended control in the experiment and the nearly ab-initio character of the model. From the model we derive a phase diagram of the system, which can be exploited in the future to study the phase transitions for this new state of matter in even more detail.

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“…This has a strong impact on the relative excitation efficiency of different quantized spinwave modes as well as on their propagation. 14 Confined spin waves in uniformly magnetized nanoscale structures have been studied by micromagnetic simulations and imaged by optical and x-ray-based techniques, [15][16][17] revealing the formation of quantized width modes. However, all-electrical experiments [18][19][20][21] at the nanoscale are still lacking due to challenges to detect spin-wave signals in reduced magnetic volumes.…”

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confidence: 99%

Electrical spin-wave spectroscopy in nanoscale waveguides with nonuniform magnetization

Talmelli

Narducci

Vanderveken

et al. 2021

Applied Physics Letters

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Spin wave modes in magnetic waveguides with the width down to 320 nm have been studied by electrical propagating spin-wave spectroscopy and micromagnetic simulations for both longitudinal and transverse magnetic bias fields. For longitudinal bias fields, a 1.3 GHz wide spin-wave band was observed in agreement with analytical dispersion relations for uniform magnetization. However, the transverse bias field led to several distinct bands, corresponding to different quantized width modes, with both negative and positive slopes. Micromagnetic simulations showed that, in this geometry, the magnetization was nonuniform and tilted due to the strong shape anisotropy of the waveguides. Simulations of the quantized spin-wave modes in such nonuniformly magnetized waveguides resulted in spin wave dispersion relations in good agreement with the experiments.

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

Abstract: Time resolved STXM provides deep insights into efficient excitation of symmetric and antisysmmetric higher order spin wave modes in magnonic waveguides. k-selective imaging reveals real space information of simultaneously excited mode patterns.

Cited by 15 publications

References 41 publications

Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz

Direct Imaging of High‐Frequency Multimode Spin Wave Propagation in Cobalt‐Iron Waveguides Using X‐Ray Microscopy beyond 10 GHz

On the long-term stability of space-time crystals

Electrical spin-wave spectroscopy in nanoscale waveguides with nonuniform magnetization

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