Band structure of a one-dimensional bilayer magnonic crystal

Alvarado-Seguel, P.; Gallardo, R. A.

doi:10.1103/physrevb.100.144415

Cited by 11 publications

(3 citation statements)

References 69 publications

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“…Magnonic crystals (MCs) are magnetic materials fabricated in the laboratory with a repeated spatial distribution that creates periodic magnetic properties 1 – 5 . They are typically prepared in several forms, either from a thin film with regular features, as antidots lattices 6 – 10 or surface-modulated MCs 11 – 13 , or by alternating two different ferromagnetic materials 8 , 14 , 15 , or by a periodic array of isolated magnetic nanostructures 7 , 16 . The main objective of creating and studying magnetic metamaterials is to be able to modify and control the propagation of spin waves 17 – 21 .…”

Section: Introductionmentioning

confidence: 99%

Omnidirectional flat bands in chiral magnonic crystals

Flores-Farías

Gallardo

Brevis

et al. 2022

Sci Rep

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The magnonic band structure of two-dimensional chiral magnonic crystals is theoretically investigated. The proposed metamaterial involves a three-dimensional architecture, where a thin ferromagnetic layer is in contact with a two-dimensional periodic array of heavy-metal square islands. When these two materials are in contact, an anti-symmetric exchange coupling known as the Dzyaloshinskii–Moriya interaction (DMI) arises, which generates nonreciprocal spin waves and chiral magnetic order. The Landau–Lifshitz equation and the plane-wave method are employed to study the dynamic magnetic behavior. A systematic variation of geometric parameters, the DMI constant, and the filling fraction allows the examination of spin-wave propagation features, such as the spatial profiles of the dynamic magnetization, the isofrequency contours, and group velocities. In this study, it is found that omnidirectional flat magnonic bands are induced by a sufficiently strong Dzyaloshinskii–Moriya interaction underneath the heavy-metal islands, where the spin excitations are active. The theoretical results were substantiated by micromagnetic simulations. These findings are relevant for envisioning applications associated with spin-wave-based logic devices, where the nonreciprocity and channeling of the spin waves are of fundamental and practical scientific interest.

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Section: Introductionmentioning

confidence: 99%

Omnidirectional flat bands in chiral magnonic crystals

Flores-Farías

Gallardo

Brevis

et al. 2022

Sci Rep

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“…Still, a magnonic device for signal processing requires a special type of waveguide capable of transporting and transforming spin waves at the nanoscale—magnonic crystals [ 5 ]. Periodical variation of the magnitude and phase of spin waves in magnonic crystals results in the presence of a bandgap structure that prohibits the transportation of certain spin waves [ 6 , 7 ]. This makes magnonic crystals competitive in fields of logic, quantum, and optoelectronic computing along with plasmonics, photonics, and phononics.…”

Section: Introductionmentioning

confidence: 99%

“…The magnonic crystal band structure can be tuned up by using ferromagnetic structures exhibiting strong magnetic interactions leading to a step-like hysteresis behavior [ 7 , 9 , 10 ]. In such systems, the frequency and velocity of the spin wave modes can be shifted up or down depending on the intermediate magnetization states of the magnonic crystal.…”

Section: Introductionmentioning

confidence: 99%

FORC-Diagram Analysis for a Step-like Magnetization Reversal in Nanopatterned Stripe Array

et al. 2021

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The fabrication approach of a magnonic crystal with a step-like hysteresis behavior based on a uniform non-monotonous iron layer made by shadow deposition on a preconfigured substrate is reported. The origin of the step-like hysteresis loop behavior is studied with local and integral magnetometry methods, including First-Order Reversal Curves (FORC) diagram analysis, accompanied with magnetic microstructure dynamics measurements. The results are validated with macroscopic magnetic properties and micromagnetic simulations using the intrinsic switching field distribution model. The proposed fabrication method can be used to produce magnonic structures with the controllable hysteresis plateau region’s field position and width that can be used to control the magnonic crystal’s band structure by changing of an external magnetic field.

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Strain-mediated tunability of spin-wave spectra in the adjacent magnonic crystal stripes with piezoelectric layer

Grachev

Matveev

Mruczkiewicz

et al. 2021

Applied Physics Letters

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We demonstrate that properties of spin-wave propagation in the adjacent magnonic crystal stripes with one of them in contact with a piezoelectric layer can be controlled by an external electric field. We perform microwave spectroscopy and employ a theoretical approach based on the analysis of the set of coupled wave equations. By considering incident and reflected waves in the first Brillouin zone, we calculate the reflection coefficients of the magnonic structure. Two narrow magnon bands are observed in the experiment, and their behavior with the variation of the electric field applied to the piezoelectric layer was shown. The finite-element calculations of the self-consistent eigenvalue problem elucidate how the influence of the piezoelectric layer can be modeled as a localized strain-induced internal magnetic field and its variation affects the spin-wave dispersion. Both the frequency shift and closing of a magnon band are detected in our measurements and confirmed by the simulations and the analytical approach. Therefore, we demonstrate the electric field control of the magnonic bands. Our results reveal the mechanism of the spin-wave spectra control in the coupled magnonic crystals. The results pave the way for the implementation of frequency selective magnonic devices based on a straintronic approach.

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Band structure of a one-dimensional bilayer magnonic crystal

Cited by 11 publications

References 69 publications

Omnidirectional flat bands in chiral magnonic crystals

Omnidirectional flat bands in chiral magnonic crystals

FORC-Diagram Analysis for a Step-like Magnetization Reversal in Nanopatterned Stripe Array

Strain-mediated tunability of spin-wave spectra in the adjacent magnonic crystal stripes with piezoelectric layer

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