Spin-Wave Dispersion Measurement by Variable-Gap Propagating Spin-Wave Spectroscopy

Vaňatka, Marek; Szulc, Krzysztof; Wojewoda, Ondřej; Dubs, Carsten; Chumak, A. V.; Krawczyk, Maciej; Dobrovolskiy, Oleksandr V.; Kłos, Jarosław W.; Urbánek, Michal

doi:10.1103/physrevapplied.16.054033

Cited by 19 publications

(13 citation statements)

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“… 51 The dispersion relation was calculated by numerically solving the eigenproblem of eqs 1 and 3 for each wavevector separately. 53 The structure in the parallel and antiparallel states was analyzed using the full 3D Landau-Lifshitz-Gilbert equation. First, time-domain simulations were used to relax a single unit cell with the predefined domain structure [ m x = M S | cos (2 πy / a )|, m y = M S sin(2 πy / a ) in the NdCo layer, m x = +(−) M S in the Py layer in parallel (antiparallel) state] as a function of the lattice constant a to find the configuration of the minimum energy.…”

Section: Methodsmentioning

confidence: 99%

“…The structure in the saturated state was analyzed with the 2D Landau-Lifshitz-Gilbert equation using the linear approximation of eq assuming m y , m z ≪ m x ≈ M S . The dispersion relation was calculated by numerically solving the eigenproblem of eqs and for each wavevector separately . The structure in the parallel and antiparallel states was analyzed using the full 3D Landau-Lifshitz-Gilbert equation.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Reconfigurable Magnonic Crystals Based on Imprinted Magnetization Textures in Hard and Soft Dipolar-Coupled Bilayers

et al. 2022

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Reconfigurable magnetization textures offer control of spin waves with promising properties for future low-power beyond-CMOS systems. However, materials with perpendicular magnetic anisotropy (PMA) suitable for stable magnetization-texture formation are characterized by high damping, which limits their applicability in magnonic devices. Here, we propose to overcome this limitation by using hybrid structures, i.e., a PMA layer magnetostatically coupled to a low-damping soft ferromagnetic film. We experimentally show that a periodic stripe-domain texture from a PMA layer is imprinted upon the soft layer and induces a nonreciprocal dispersion relation of the spin waves confined to the low-damping film. Moreover, an asymmetric bandgap features the spin-wave band diagram, which is a clear demonstration of collective spin-wave dynamics, a property characteristic for magnonic crystals with broken time-reversal symmetry. The composite character of the hybrid structure allows for stabilization of two magnetic states at remanence, with parallel and antiparallel orientation of net magnetization in hard and soft layers. The states can be switched using a low external magnetic field; therefore, the proposed system obtains an additional functionality of state reconfigurability. This study offers a link between reconfigurable magnetization textures and low-damping spin-wave dynamics, providing an opportunity to create miniaturized, programmable, and energy-efficient signal processing devices operating at high frequencies.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Reconfigurable Magnonic Crystals Based on Imprinted Magnetization Textures in Hard and Soft Dipolar-Coupled Bilayers

et al. 2022

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“…Especially in metallic systems with larger damping, it is important to ensure the optimal propagation geometry with a high group velocity in order to be able to propagate spin waves over reasonable distances. To characterize spin-wave transmission, the new variable-gap propagating spin-wave spectroscopy can be efficiently employed [204]. The works referenced in this section present the first building blockswaveguides able to propagate fast spin waves without the presence of the external magnetic field.…”

Section: F Spin-wave Propagation In Materials With Locally Controlled...mentioning

confidence: 99%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors that covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with Boolean digital data, unconventional approaches like neuromorphic computing, and the progress towards magnon-based quantum computing. The article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.

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“…The spin waves were excited by a stripline nanoantenna (180 nm wide, 105 nm thick multilayer stack: 10 nm SiO 2 /85 nm Cu/10 nm Au), fabricated by EBL and lift-off process. The antenna enabled excitation of spin waves with wavelengths down to ≈ 200 nm (k ≈ 30 rad/µm) [23,24]. The square array consisting of 200 nm-wide and 60 nm-thick sputter-deposited silicon disks was fabricated by EBL and lift-off process in the vicinity of the antenna.…”

Section: Lithography (Ebl) Techniques the Nanoresonators Can Be Place...mentioning

confidence: 99%

Phase-resolved optical characterization of nanoscale spin waves

Wojewoda¹,

Hrtoň²,

Dhankhar³

et al. 2023

Preprint

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Spin-Wave Dispersion Measurement by Variable-Gap Propagating Spin-Wave Spectroscopy

Cited by 19 publications

References 47 publications

Reconfigurable Magnonic Crystals Based on Imprinted Magnetization Textures in Hard and Soft Dipolar-Coupled Bilayers

Reconfigurable Magnonic Crystals Based on Imprinted Magnetization Textures in Hard and Soft Dipolar-Coupled Bilayers

Advances in Magnetics Roadmap on Spin-Wave Computing

Phase-resolved optical characterization of nanoscale spin waves

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