Magnonic band gaps in YIG-based one-dimensional magnonic crystals: An array of grooves versus an array of metallic stripes

Bessonov, V. D.; Mruczkiewicz, M.; Gieniusz, R.; Guzowska, U.; Maziewski, A.; Stognij, A. I.; Krawczyk, Maciej

doi:10.1103/physrevb.91.104421

Cited by 49 publications

(39 citation statements)

References 44 publications

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“…2. Indirect bandgaps originated by the inhomogeneous distribution of the surface SW intensity across the thickness, have been reported on thick metallized MCs with periodicities of hundreds of micrometers [64][65][66]. Then, the associated wavelengths are three orders of magnitude smaller in our system, which imposes a significant advantage for the miniaturization of magnonic devices.…”

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confidence: 64%

Flat Bands, Indirect Gaps, and Unconventional Spin-Wave Behavior Induced by a Periodic Dzyaloshinskii-Moriya Interaction

et al. 2019

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Periodically patterned metamaterials are known for exhibiting wave properties similar to the ones observed in electronic band structures in crystal lattices. In particular, periodic ferromagnetic materials are characterized by the presence of bands and bandgaps in their spin-wave spectrum at tunable GHz frequencies. Recently, the fabrication of magnets hosting Dzyaloshinskii-Moriya interactions has been pursued with high interest since properties such as the stabilization of chiral spin textures and nonreciprocal spin-wave propagation emerge from this antisymmetric exchange coupling. In this context, to further engineer the magnon band structure, we propose the implementation of magnonic crystals with periodic Dzyaloshinskii-Moriya interactions, which can be obtained, for instance, via patterning of periodic arrays of heavy-metals wires on top of an ultrathin magnetic film. We demonstrate through theoretical calculations and micromagnetic simulations that such systems show an unusual evolution of the standing spin waves around the gaps in areas of the film that are in contact with the heavy-metal wires. We also predict the emergence of indirect gaps and flat bands and, effects that depend on the strength of the Dzyaloshinskii-Moriya interaction. This study opens new routes towards engineered metamaterials for spin-wave-based devices. arXiv:1806.08333v2 [cond-mat.mes-hall]

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confidence: 64%

Flat Bands, Indirect Gaps, and Unconventional Spin-Wave Behavior Induced by a Periodic Dzyaloshinskii-Moriya Interaction

et al. 2019

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“…We employ metallization techniques to modulate the wavelength of the FV SW for realizing MCs [18,19,30,39,44,45]. As shown in Ref.…”

Section: B Modulation Of the Wavelength Using Cumentioning

confidence: 99%

“…Hence, the use of phase interference including MCs with FV SWs is significantly promising. However, only a few experimental studies [29] have researched MCs using FV SWs, although many experimental reports have described two modes-specifically, surface SWs (S SWs) [30][31][32][33][34][35] and backward volume SWs (BV SWs) [3,29,[36][37][38]. This is mainly because of the significant noise in the FV SW configuration, which makes it difficult to observe a magnonic band gap (MBG) in experiments that employ low damping materials (yttrium iron garnets, YIG) as waveguides.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Magnonic Crystal With Cu Stripes for Forward Volume Spin Waves

et al. 2019

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A one-dimensional magnonic crystal for forward volume spin waves (FV SWs) is demonstrated using eight pairs of Cu stripes fabricated on a 1-mm wide × 14-mm long × 10.2-µm thick yttrium iron garnet (YIG) waveguide and a SW absorber of 30-nm-thick Au film. The development of this crystal is challenging due to strong spectral oscillations caused by edge reflections and process difficulties associated with YIG magnonic crystals. A magnonic band gap with a depth of −4.6 dB is observed at a frequency of 1.80 GHz for a FV SW excited by a 50-µm-wide microstrip line, which is in good agreement with simulation results using three-dimensional modeling in the radio frequency region. The obtained performance is illustrated by plotting the depth of the respective band gaps vs the pair number of the stripes. This value is compared with that obtained in previous studies.

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“…However, experimentally defining material parameters such as magnetization or exchange length with laterally well defined periodicities often is not straightforward and suffers from limitations of the range in which variations are possible for a given material. A periodic surface modulation of a ferromagnetic (FM) thin film is an interesting alternative to creating magnonic structures and devices, where the periodic properties are attributed to the size of the modulation [38][39][40][41]45,46,[50][51][52][53][54][55]. For instance, yttrium iron garnet (YIG) films with periodic arrays of micrometer-sized etched grooves have been synthesized [45,46,50,51,[53][54][55], while FM films with nanometric grooves have been created by means of ion implantation [42,43] and electron-beam lithography [40].…”

Section: Introductionmentioning

confidence: 99%

Dipolar interaction induced band gaps and flat modes in surface-modulated magnonic crystals

et al. 2018

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Theoretical results for the magnetization dynamics of a magnonic crystal formed by grooves on the surface of a ferromagnetic film, called a surface-modulated magnonic crystal, are presented. For such a system, the role of the periodic dipolar field induced by the geometrical modulation is addressed by using the plane-wave method. The results reveal that, under the increasing of the depth of the grooves, zones with magnetizing and demagnetizing fields act on the system in such a way that magnonic band gaps are observed in both Damon-Eshbach and backward volume geometries. Particularly, in the backward volume configuration, high-frequency band gaps and lowfrequency flat modes are obtained. By taking into account the properties of the internal field induced by the grooves, the flattening of the modes and their shift towards low frequencies are discussed and explained. To test the validity of the model, the theoretical results of this work are confirmed by micromagnetic simulations, and good agreement between both methods is achieved. The theoretical model allows for a detailed understanding of the physics underlying these kinds of systems, thereby providing an outlook for potential applications on magnonic devices.

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Magnonic band gaps in YIG-based one-dimensional magnonic crystals: An array of grooves versus an array of metallic stripes

Cited by 49 publications

References 44 publications

Flat Bands, Indirect Gaps, and Unconventional Spin-Wave Behavior Induced by a Periodic Dzyaloshinskii-Moriya Interaction

Flat Bands, Indirect Gaps, and Unconventional Spin-Wave Behavior Induced by a Periodic Dzyaloshinskii-Moriya Interaction

One-Dimensional Magnonic Crystal With Cu Stripes for Forward Volume Spin Waves

Dipolar interaction induced band gaps and flat modes in surface-modulated magnonic crystals

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