Spin wave propagation and nonreciprocity in metallic magnonic quasi-crystals

2021 ◽  
Author(s):  
Takashi Manago ◽  
Kanta Fujii ◽  
Kenji Kasahara ◽  
Kazuyuki Nakayama
Keyword(s):  
Wave Propagation ◽  
Band Gap ◽  
Spin Wave ◽  
Spin Waves ◽  
Fibonacci Sequence ◽  
Propagation Direction ◽  
Band Gaps ◽  
Sequence Length ◽  
Micromagnetic Simulations ◽  
Quasi Crystals

Abstract The characteristics of spin waves propagating in Fibonacci magnonic quasi-crystals (MQCs) were investigated in micromagnetic simulations. The spin waves feel 1/3rd of the characteristic Fibonacci sequence length as a period, and mini band gaps reflected by MQCs are formed. The effect of the MQC on the spin wave’s propagation becomes prominent above the first band gap frequency. The properties of spin waves in MQCs generally depend on the propagation direction, because spin waves feel different structures depending on the direction. Therefore, the nonreciprocity (NR) characteristics becomes complex. The NR characteristics change at every band gap frequency and hence across the frequency regions defined by them. In particular, some frequency regions have almost no NR, while others have enhanced NR and some have even negative NR. These characteristics provide a new way to control NR.

Wave propagation in acoustic metamaterials with resonantly shunted cross-shape piezos

2018 ◽  
Vol 29 (13) ◽  
pp. 2744-2753 ◽  
Author(s):  
Shengbing Chen
Keyword(s):  
Wave Propagation ◽  
Band Gap ◽  
Vibration Isolation ◽  
Band Gaps ◽  
Acoustic Metamaterials ◽  
Resonant Frequencies ◽  
Piezoelectric Patch ◽  
Transmission Properties ◽  
Gap Width ◽  
Band Gap Width

Cross-shape piezoelectric patches were originally proposed to improve the band-gap properties of acoustic metamaterials with shunting circuits. The dispersion curves are characterized through the application of finite element method. Also, the theoretical band-gap predictions are verified by simulation results obtained from COMSOL. The investigation results show that the proposed scheme distinguishes itself from the conventional square patches by broader band gaps, whose bandwidth is almost doubled. The inherent capacitance of the piezoelectric patch is strongly related to the boundary conditions, so the local resonant band gap is strongly affected by the shape of piezoelectric patches as well. As a result, the band-gap width and location of metamaterials with different shape patches are rather different, even with the same size patches. Also, negative modulus (NM) and Poisson’s ratio were observed around the resonant frequencies. The transmission properties of finite periods agree well with band-gap predictions. An obvious attenuation zone (AZ) is produced around the band-gap location, in which the wave propagation is decayed strongly. Similarly, the width of AZ of the proposed metamaterial is much larger than that of the conventional one. Hence, the proposed scheme demonstrates more advantages in the application to vibration isolation when compared with the conventional.

scholarly journals Interfacial Dzialoshinskii–Moriya interaction induced nonreciprocity of spin waves in magnonic waveguides

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46454-46459 ◽  
Author(s):  
Fusheng Ma ◽  
Yan Zhou
Keyword(s):  
Wave Propagation ◽  
Spin Wave ◽  
Spin Waves ◽  
Moriya Interaction

Nonreciprocal spin wave propagation in magnonic waveguides with the presence of interfacial Dzialoshinskii–Moriya interaction: different frequencies, amplitudes, and mode profiles.

Spin Waves in Multilayers with Different Magnitudes of the Magnetization, Exchange, and Anisotropy

2012 ◽  
Vol 190 ◽  
pp. 71-74 ◽  
Author(s):  
V.A. Ignatchenko ◽  
D.S. Tsikalov
Keyword(s):  
Spin Wave ◽  
Spin Waves ◽  
Wave Spectrum ◽  
Band Gaps ◽  
Sinusoidal Modulation ◽  
One Dimensional ◽  
Material Parameters ◽  
Magnetic Parameters ◽  
The Difference ◽  
Spin Wave Spectrum

The spin-wave spectrum in one-dimensional magnon crystals periodic superlattices (SLs) is investigated for the rectangular and sinusoidal modulation profile of the material parameters. The dependences of band gaps in the spectrum on both the difference of the magnetic parameters in adjacent layers and the ratio of the layer thicknesses are calculated.

Wave Motion in Periodic Flexural Beams and Characterization of the Transition Between Bragg Scattering and Local Resonance

2011 ◽  
Vol 79 (1) ◽  
Author(s):  
Liao Liu ◽  
Mahmoud I. Hussein
Keyword(s):  
Wave Propagation ◽  
Band Structure ◽  
Band Gap ◽  
Frequency Band ◽  
Band Gaps ◽  
Flexural Wave ◽  
Propagation Mechanism ◽  
Bragg Scattering ◽  
Frequency Spectra ◽  
Local Resonance

Band gaps appear in the frequency spectra of periodic materials and structures. In this work we examine flexural wave propagation in beams and investigate the effects of the various types and properties of periodicity on the frequency band structure, especially the location and width of band gaps. We consider periodicities involving the repeated spatial variation of material, geometry, boundary and/or suspended mass along the span of a beam. In our formulation, we implement Bloch’s theorem for elastic wave propagation and utilize Timoshenko beam theory for the kinematical description of the underlying flexural motion. For the calculation of the frequency band structure we use the transfer matrix method, derived here in generalized form to enable separate or combined consideration of the different types of periodicity. Our results provide band-gap maps as a function of the type and properties of periodicity, and as a prime focus we identify and mathematically characterize the condition for the transition between Bragg scattering and local resonance, each being a unique wave propagation mechanism, and show the effects of this transition on the lowest band gap. The analysis presented can be extended to multi-dimensional phononic crystals and acoustic metamaterials.

scholarly journals Control of Dynamics in Weak PMA Magnets

2021 ◽  
Vol 7 (3) ◽  
pp. 43
Author(s):  
Luis M. Álvarez-Prado
Keyword(s):  
Thin Film ◽  
Wave Propagation ◽  
Magnetic Fields ◽  
Spin Wave ◽  
Ferromagnetic Resonance ◽  
Applied Field ◽  
Magnetic Thin Film ◽  
Micromagnetic Simulations ◽  
Domain Structures ◽  
High Degree

We have recently shown that a hybrid magnetic thin film with orthogonal anisotropies presenting weak stripe domains can achieve a high degree of controllability of its ferromagnetic resonance. This work explores the origin of the reconfigurability through micromagnetic simulations. The static domain structures which control the thin film resonance can be found under a deterministic applied field protocol. In contrast to similar systems reported, our effect can be obtained under low magnetic fields. We have also found through simulations that the spin wave propagation in the hybrid is nonreciprocal: two adjacent regions emit antiparallel spin waves along the stripe domains. Both properties convert the hybrid in a candidate for future magnonic devices at the nanoscale.

scholarly journals Magnonic Crystal with Strips of Magnetic Nanoparticles: Modeling and Experimental Realization via a Dip-coating Technique

2021 ◽  
Author(s):  
Zorayda Lazcano-Ortiz ◽  
Cesar L. Ordóñez-Romero ◽  
Jorge Luis Domínguez-Juárez ◽  
Guillermo Monsivais Monsivais ◽  
Rafael Quintero-Torres ◽  
...  
Keyword(s):  
Spin Wave ◽  
Magnetite Nanoparticles ◽  
Yttrium Iron Garnet ◽  
Spin Waves ◽  
Dip Coating ◽  
Band Gaps ◽  
Yttrium Iron ◽  
Magnonic Crystal ◽  
Iron Garnet ◽  
Dip Coating Technique

In this article, we show theoretically and experimentally the formation of spin-waves band gaps in a magnonic crystal that was implemented by the deposition of periodic micro-structured strips of magnetite nanoparticles. A theoretical model describing the spectra of the transmitted spin-waves bandgaps is proposed. This is achieved using a simple model based on microwave transmission line theory and considering the presence of micro-structured strips of magnetite nanoparticles on the surface. Such magnonic crystal of equally spaced micro-structured strips of magnetite nanoparticles on the surface of an yttrium iron garnet thin film has been implemented and measured. The periodic micro-structured nanoparticles are deposited on the surface of such yttrium iron garnet single-crystal film grown on a gallium-gadolinium garnet substrate via dip-coating technique. Propagation of magnetostatic surface spin-waves is studied and it is shown that the presence of such periodic structure leads to the formation of spin-wave band gaps in the transmission characteristics. The spin-wave detection has been carried out using a pair of microwave antennas and a vector network analyzer. The results show that the periodic structure formed by the magnetite strips modifies the spectra of the transmitted spin waves producing band gaps.

scholarly journals Spin wave propagation in uniform waveguide: effects, modulation and its application

2022 ◽  
Author(s):  
Lei Zheng ◽  
Lichuan Jin ◽  
Tianlong Wen ◽  
Yulong Liao ◽  
Xiaoli Tang ◽  
...  
Keyword(s):  
Wave Propagation ◽  
Information Transmission ◽  
Spin Wave ◽  
Spin Waves ◽  
Complementary Metal Oxide Semiconductor ◽  
Wide Band ◽  
Oxide Semiconductor ◽  
Research Progress ◽  
Freedom Of Information ◽  
Band Frequency

Abstract With the advent of the post-Moore era, researches on beyond-Complementary Metal Oxide Semiconductor (CMOS) approaches have been attracted more and more attention. Magnonics, or spin wave is one of the most promising technology beyond CMOS, which magnons-quanta for spin waves-process the information analogous to electronic charges in electronics. Information transmission by spin waves, which uses the frequency, amplitude and (or) phase to encode information, has a great many of advantages such as extremely low energy loss and wide-band frequency. Moreover, using the nonlinear characteristics of spin waves for information transmission can increase the extra degree of freedom of information. This review provides a tutorial overview over the effects of spin wave propagation and recent research progress in uniform spin wave waveguide. The propagation characteristics of spin waves in uniform waveguides and some special propagation phenomena such as spin wave beam splitting and self-focusing are described by combining experimental phenomena and theoretical formulas. Furthermore, we summarize methods for modulating propagation of spin wave in uniform waveguide, and comment on the advantages and limitations of these methods. The review may promote the development of information transmission technology based on spin waves.

scholarly journals Band Gap Formation and Tunability in Stretchable Serpentine Interconnects

2017 ◽  
Vol 84 (9) ◽  
Author(s):  
Pu Zhang ◽  
William J. Parnell
Keyword(s):  
Wave Propagation ◽  
Elastic Wave ◽  
Band Gap ◽  
Phononic Crystals ◽  
Band Gaps ◽  
Electronic Systems ◽  
Gap Formation ◽  
Highly Stretchable ◽  
Metallic Interconnects ◽  
Phononic Band Gaps

Serpentine interconnects are highly stretchable and frequently used in flexible electronic systems. In this work, we show that the undulating geometry of the serpentine interconnects will generate phononic band gaps to manipulate elastic wave propagation. The interesting effect of “bands-sticking-together” is observed. We further illustrate that the band structures of the serpentine interconnects can be tuned by applying prestretch deformation. The discovery offers a way to design stretchable and tunable phononic crystals by using metallic interconnects instead of the conventional design with soft rubbers and unfavorable damping.

scholarly journals Magnonic band spectrum of spin waves in an elliptical helix

2018 ◽  
Vol 5 (1) ◽  
pp. 172285 ◽  
Author(s):  
A. V. Golovchan ◽  
V. V. Kruglyak ◽  
V. S. Tkachenko ◽  
A. N. Kuchko
Keyword(s):  
Perturbation Theory ◽  
Band Gap ◽  
Spin Wave ◽  
Spin Waves ◽  
Wave Spectrum ◽  
Three Dimensional ◽  
Band Spectrum ◽  
Square Root ◽  
Structural Elements ◽  
Spin Wave Spectrum

We show that the spin-wave spectrum in an elliptical helix has a band character. The size of the first band gap calculated using the perturbation theory is shown to scale as square root of the eccentricity. Curved magnonic waveguides of the kind considered here could be used as structural elements of future three-dimensional magnonic architectures.

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