Spin-wave transmission through an internal boundary: Beyond the scalar approximation

Verba, Roman; Tiberkevich, Vasil; Slavin, A. N.

doi:10.1103/physrevb.101.144430

Cited by 18 publications

(15 citation statements)

References 47 publications

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“…For spin waves converting from the λ 1 to the λ 2 mode (incoming waves) or vice versa (outgoing waves), we estimate transmission coefficients t 12 = 1 and t 21 = 0.5, respectively. The quantitative assessment of transmissions involving λ 1 and λ 3 modes is complicated by a difference in wave localization and spin-wave ellipticity (ϵ ¼ 1 À m min =m max ) 33 . While the wave profiles of the λ 1 and λ 2 modes are approximately uniform across the YIG film thickness, the short-wavelength λ 3 mode localizes at the top surface.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

et al. 2021

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Active control of propagating spin waves on the nanoscale is essential for beyond-CMOS magnonic computing. Here, we experimentally demonstrate reconfigurable spin-wave transport in a hybrid YIG-based material structure that operates as a Fabry-Pérot nanoresonator. The magnonic resonator is formed by a local frequency downshift of the spin-wave dispersion relation in a continuous YIG film caused by dynamic dipolar coupling to a ferromagnetic metal nanostripe. Drastic downscaling of the spin-wave wavelength within the bilayer region enables programmable control of propagating spin waves on a length scale that is only a fraction of their wavelength. Depending on the stripe width, the device structure offers full nonreciprocity, tunable spin-wave filtering, and nearly zero transmission loss at allowed frequencies. Our results provide a practical route for the implementation of low-loss YIG-based magnonic devices with controllable transport properties.

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Section: Resultsmentioning

confidence: 99%

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

et al. 2021

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“…Our experimental configuration, similar to previously reported 30 – 33 , is relevant to the Schlömann excitation mechanism of spin wave 44 with a dynamic pinning at the interface 45 . The interfaces of two distinct, coupled magnetic layers have been recently recognized as an interesting source of spin dynamics generation and manipulation 46 , 47 . In particular, the critical role of the microwave susceptibilities of the distinct magnetic layers has been theoretically laid out 48 , 49 that are directly relevant to the magnon-magnon coupled experiments 30 – 33 .…”

Section: Resultsmentioning

confidence: 99%

Probing magnon–magnon coupling in exchange coupled Y$$_3$$Fe$$_5$$O$$_{12}$$/Permalloy bilayers with magneto-optical effects

Xiong

Hammami

et al. 2020

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We demonstrate the magnetically-induced transparency (MIT) effect in Y 3 fe 5 o 12 (YIG)/Permalloy (Py) coupled bilayers. The measurement is achieved via a heterodyne detection of the coupled magnetization dynamics using a single wavelength that probes the magneto-optical Kerr and Faraday effects of Py and YIG, respectively. Clear features of the MIT effect are evident from the deeply modulated ferromagnetic resonance of Py due to the perpendicular-standing-spin-wave of YIG. We develop a phenomenological model that nicely reproduces the experimental results including the induced amplitude and phase evolution caused by the magnon-magnon coupling. Our work offers a new route towards studying phase-resolved spin dynamics and hybrid magnonic systems. Hybrid magnonic systems are becoming rising contenders for coherent information processing 1-4 , owing to their capability of coherently connecting distinct physical platforms in quantum systems as well as the rich emerging physics for new functionalities 5-22. Magnons have been demonstrated to efficiently couple to cavity quantum electrodynamics systems including superconducting resonators and qubits 5-9 ; magnonic systems are therefore well-positioned for the next advances in quantum information. In addition, recent studies also revealed the potential of magnonic systems for microwave-optical transduction 23-29 , which are promising for combining quantum information, sensing, and communication. To fully leverage the hybrid coupling phenomena with magnons, strong and tunable couplings between two magnonic systems have attracted considerable interests recently 30-33. They can be considered as hosting hybrid magnonic modes in a "magnonic cavity" as opposed to microwave photonic cavity in cavity-magnon polaritons (CMPs) 1-3 , which allows excitations of forbidden modes and high group velocity of spin waves owing to the state-of-the-art magnon bandgap engineering capabilities 31,34. The detuning of the two magnonic systems can be easily engineered by the thickness of the thin films, which set the wavenumbers and the corresponding exchange field. Furthermore, in such strongly coupled magnetic heterostructures, both magneto-optical Kerr and Faraday effects can be utilized for light modulation, in terms of light reflection by metals and/or transmission in insulators, respectively. In this architecture, the freedom of lateral dimensions is maintained for device fabrication and large-scale, on-chip integration. To date, both magnon-photon and magnon-magnon couplings are predominantly investigated by the cavity ferromagnetic resonance (FMR) spectroscopy, i.e. microwave transmission and/or reflection measurements, typically involving a vector-network analyzer (VNA) or a microwave diode 5,7-13,30-33,35. Strong magnon-magnon couplings have been observed in yttrium iron garnet (Y 3 Fe 5 O 12 , YIG) coupled with ferromagnetic (FM) metals, where exchange spin waves were excited by a combined action of exchange, dampinglike, and/or fieldlike torques that are localized at the interfaces ...

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“…One can refer to, for instance, employing voltage [10][11][12] and strain [13,14], tuning of the magnon chemical potential via non-local injection [15,16], laser beams [17], spin textures [18][19][20], etc. Recently, it was shown that surface inhomogeneities in the form of surface roughness and defects can significantly influence the transmission characteristics of the SWs in thin films [21][22][23][24]. In those films, the contribution of the exchange energy to the magnon band structure is large enough to suppress direct mode-hybridization by opening up an energy gap between the fundamental mode and higher-order thickness modes [25].…”

Section: Introductionmentioning

confidence: 99%

Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy

et al. 2020

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Spin waves are promising candidates to carry, transport and process information. Controlling the propagation characteristics of spin waves in magnetic materials is an essential ingredient for designing spin-wave based computing architectures. Here, we study the influence of surface inhomogeneities on the spin wave signals transmitted through thin films. We use micromagnetic simulations to study the spin-wave dynamics in an in-plane magnetized yttrium iron garnet thin film with thickness in the nanometre range in the presence of surface defects in the form of locally introduced uniaxial anisotropies. These defects are used to demonstrate that the Backward Volume Magnetostatic Spin Waves (BVMSW) are more responsive to backscattering in comparison to Magnetostatic Surface Spin Waves (MSSWs). For this particular defect type, the reason for this behavior can be quantitatively related to the difference in the magnon band structures for the two types of spin waves. To demonstrate this, we develop a quasi-analytical theory for the scattering process. It shows an excellent agreement with the micromagnetic simulations, sheds light on the backscattering processes, and provides a new way to analyze the spin-wave transmission rates in the presence of surface inhomogeneities in sufficiently thin films, for which the role of exchange energy in the spin wave dynamics is significant. Our study paves the way to designing magnonic logic devices for data processing which rely on a designed control of spin-wave transmission. B. Original Born-Equation based model of spin wave scattering from 2D defectsthe mesh cell size.) This converts the tensor into a matrix  with elements ij. Then the right-hand side of ( 22) is obtained by acting with ˆ( ) exc G x on an assumed localised excitation source. The source is located at

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Spin-wave transmission through an internal boundary: Beyond the scalar approximation

Cited by 18 publications

References 47 publications

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

Nanoscale magnonic Fabry-Pérot resonator for low-loss spin-wave manipulation

Probing magnon–magnon coupling in exchange coupled Y$$_3$$Fe$$_5$$O$$_{12}$$/Permalloy bilayers with magneto-optical effects

Controlling the propagation of dipole-exchange spin waves using local inhomogeneity of the anisotropy

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